bluuebunny/crossref_metadata_2025_split huggingface dataset:
Peak Alpha Frequency in Relation to Cognitive Performance
Authors: Rathee Sushma , Bhatia Divya , Punia Vikas , Singh Rajbir 
Published: June 2020

Abstract

Objective  Peak alpha frequency (PAF) is reported to be a nervous system property which is genetically endowed and reflected in individual’s cognitive functioning. Cognitive performance denotes the mental processes for effective changes in response to situations in general and mental task in particular. None of the study has till now used reading comprehension as a measure of cognitive functioning, which is considered to be a measure of higher cognitive processes. The reading comprehension task used in the study implies certain cognitive processes such as reading ability, comprehension, memory performance involving information maintenance, and retrieval. Therefore, the study was conducted to test the hypothesis of differences in cognitive reading comprehension performance between high- and low-peak alpha subjects.

Materials and Methods A group of 300 healthy participants were selected on the basis of incidental-cum-probabilistic sampling from seven districts of Indian state of Haryana. In the present study, reading comprehension task (Hindi–English; bilingual format) was used to assess the cognitive performance and multichannel electroencephalography alpha frequencies were recorded to measure PAF through power spectrum density analysis of each subject.

Results The findings revealed that individuals with high-peak alpha frequency had significantly higher score (p < 0.05) on reading comprehension task as compared with individuals with low PAF.

Conclusion The present study concluded that the reading comprehension task is effected by peak alpha frequency of an individual. PAF can be considered to be a correlate of cognitive performance.
Isolated Arthroscopic Radial Styloidectomy: The Three-Portal Approach
Authors: Herzberg Guillaume , Burnier Marion 
Published: June 2020

Abstract
Background The current gold-standard technique for radial styloidectomy is arthroscopic. The use of only two dorsal portals may not allow a crystal-clear view of the dorsal arthritic rim of the radius because of the dorsal capsule synovitis.
Objectives To propose a new technique for isolated arthroscopic radial styloidectomy. The addition of a volar radial portal and a sequential procedure are presented.
Patients and Methods Two trochars for alternatively viewing from volar radial or 3–4 are used. A 1–2 portal is used for instrumentation with a motorized burr. We have been using the three-portal technique in 34 cases (26 isolated).
Results This modification of the classic arthroscopic radial styloidectomy is technically easy and the view of the dorsal rim of the radius provides a clear definition and treatment of the dorso-radial arthritic pathology.
Conclusions The authors recommend this technical trick to perform an easy and comprehensive isolated palliative or curative arthroscopic radial styloidectomy.
Reaction of dication C++ with molecular hydrogen at temperature 20 K
Authors: Plašil R , Kovalenko A , Tran T D , Rednyk S , Dohnal P , Roučka Š , Glosík J 
Published: June 2020

Synopsis
The reaction of dication C++ with H2 was studied at temperature 20 K using a linear 22-pole radiofrequency ion trap. The overall reaction rate coefficient was measured as 1.4 ± 0.3 × 10−10 cm3 s−1. The upper limit for formation of CH+ in this reaction was evaluated as 4 × 10−12 cm3 s−1.
Chiral Bloch oscillations of a biased bosonic ladder in an artificial gauge field
Authors: Qiao X , Zhang X B , Zhang A X , Yu Z F , Xue J K 
Published: June 2020

Synopsis
Rich chiral Bloch oscillations are predicted to distinguish the Meissner phase, Vortex phase and two new Plane Wave phases of the biased non-interacting bosonic ladder in an artificial gauge field.
Design and simulation of a novel magneto-optic trap
Authors: Mootheril D M , Kurz N , Mezinska S , Pfeifer T , Dorn A 
Published: June 2020

Synopsis
In order to study ultracold gases by photoionization within a Reaction Microscope (ReMi), we investigate a new magneto-optical trap (MOT) configuration for cooling and trapping the atoms. Here we present the simulation results. In comparison with the conventional MOT, the new MOT has four laser beam axes. Two radial laser beam axes along x and y directions and two laser beam axes inclined ± 450 to the MOT/Feshbach coil axis (z axis).
Entropic uncertainty as a predictor of avoided crossing for confined system
Authors: Saha S , Jose J , Deshmukh P C 
Published: June 2020

Synopsis
Avoided Crossings are one of the unique spectroscopic features of confined atomic system. Shannon’s information entropy as a predictor of these phenomena by varying the perturbation (confinement strength) on ground state and some of excited states of H atom is studied in this work. In addition to the energy level repulsion at avoided crossing, it is observed that Shannon’s entropy also assures the exchange of information of involved states, and also validates entopic uncertainty.
Observation of indirect ionization of W7+ in EBIT plasma
Authors: Lu Q , He J , Tian H , Li M , Yang Y , Yao K , Chen C , Xiao J , Li J G , Tu B , Zou Y 
Published: June 2020

Synopsis
In this work, visible and EUV spectra of W7+ have been measured using the high-temperature super-conducting electron-beam ion trap at the Shanghai EBIT laboratory under extremely low-energy conditions. The relevant atomic structure has been calculated by using the flexible atomic code package and the GRASP2K code. A hypothesis for the charge-state evolution of W7+ is proposed based on our results. The occurrence of W7+ ions results from indirect ionization caused by stepwise excitation between some metastable states of lower-charge-state W ions, at the nominal electron beam energy of 59 eV.
A new F-wave resonant state in the e+-He+ system
Authors: Yan Z-C , Ho Y K 
Published: June 2020

Synopsis
Using the complex scaling method, together with employing highly correlated Hylleraas wave functions in which all the interparticle coordinates are included, we have calculated for the first time a F-wave resonance state in the positron-helium positive ion system near the postronium (ground state) formation threshold.
Theoretical studies of energy spectra and E1 transitions of Ni II ion
Authors: Rynkun P , Gaigalas G , Jönsson P 
Published: June 2020

Synopsis
Accurate atomic data of the iron group elements are of major importance in astrophysics. In the present work energy spectrum calculations are performed for 332 lowest states for Ni II ion. Energy levels are compared with NIST database recommended values. All computations were done using the general-purpose relativistic atomic structure package GRASP2018.
Generalized oscillator strengths of the valence-shell excitations of sulphur dioxide studied by fast electron impact
Authors: Du X -J , Xu Y -C , Liu Y -W , Zhu L -F 
Published: June 2020

Synopsis
Generalized oscillator strengths (GOSs) of the valence-shell excitation of sulphur dioxide are of great importance for modeling the planet’s atmospheric phenomena and astronomical observations, which are determined at an incident electron energy of 1.5keV in this work. The present GOSs are helpful to assign the experimental spectra and explore excitation dynamics.
Rayleigh scattering formalism for the tune-out wavelength: Application to the 2 3
S state of helium
Authors: Drake G W F , Manalo J G , Zhang P-P , Henson B M , Baldwin K G H 
Published: June 2020

Synopsis
The tune-out wavelength for an atom interacting with an incident laser beam is reformulated as a zero in the Rayleigh scattering cross section instead of the dynamic polarizability (or AC Stark shift). The two pictures are equivalent in lowest order, but not when higher-order retardation effects are taken into account. Detailed high-precision calculations in Hylleraas coordinates will be presented for the tune-out wavelength of helium at 413 nm near the 2 3
S – 33 P optical transition, including D-wave retardation corrections, and compared with recent high-precision measurements.
B-spline basis implementation of the Hartree-Fock method for arbitrary central potentials
Authors: Waide D T , Green D G , Gribakin G F 
Published: June 2020

Synopsis
The Hartree-Fock equations are solved using B-splines. Convergence of self-consistency iterations is achieved by turning on the electron interaction gradually. We test the ground and excited-state sets for atoms and an electron gas confined in a harmonic potential and the jellium model of alkali-metal clusters. Comparisons are made with the Thomas-Fermi approximation and dipole polarizabilities are found and compared with experiment.
Relativistic configuration interaction with core polarization method for the divalent systems
Authors: Wang X , Jiang J , Wu Z W , Xie L Y , Zhang D H , Dong C Z 
Published: June 2020

Synopsis
The relativistic configuration interaction with core polarization method and program for the divalent systems have been developed. Based on this new program, the energy levels, transition matrix elements, static and dynamic dipole polarizabilities of He, Be, and Mg atoms have been calculated systematically.
Molecular-frame angular distributions of spectator resonant interatomic coulombic decay electrons in neon dimers
Authors: Mhamdi A , Rist J , Aslitürk D , Weller M , Melzer N , Trabert D , Kircher M , Vela-Pérez I , Siebert J , Eckart S , Grundmann S , Kastirke G , Waitz M , Khan A , Schöffler M S , Trinter F , Dörner R , Jahnke T , Demekhin Ph V 
Published: June 2020

Synopsis
The spectator resonant interatomic Coulombic decay (SRICD) following the 2s →5p excitation of Ne dimers has been examined experimentally and theoretically. The molecular frame angular distributions (MFADs) of the SRICD electrons depend strongly on the direction of the polarization vector of the exciting photon with respect to the molecular axis. We demonstrate that this effect is caused by the scattering of the low-energy SRICD electron on the density of the spectator electron.
Bidimensional Sturmian basis for bound states and collision problems
Authors: Randazzo J M , Ancarani L U 
Published: June 2020

Synopsis
We present a novel spectral approach to deal both with bound states and with stationary continuum waves associated to collision problems. It is based on the definition of a two dimensional radial basis which replaces the combination of single particle basis sets as employed in most of the usual spectral methods. The new basis elements are externally defined as solutions of a generalized Sturmian eigenvalue equation containing the main properties of the physical problem under consideration.
On unified contribution of pair Coulomb excitations in three-body reactions
Authors: Levin S , Budylin A , Koptelov Y 
Published: June 2020

Synopsis
In the present work we obtain the unified contribution of pair excited states to the asymptotics (at infinity in configuration space) of the three-body absolutely continuous spectrum eigenfunctions. Note that it is the case that is most interesting and rich from the physical point of view, as it is connected in particular with re-clustering of charged quantum complexes.
Electron-impact excitation of forbidden and allowed transitions in Cr II
Authors: Tayal S S , Zatsarinny O 
Published: June 2020

Synopsis
The B-spline R-matrix method is used to investigate the electron-impact excitation of Cr II. The close-coupling expansion contains 512 fine-structure levels of Cr II and includes all levels of the 3d5, 3d44s, 3d34s2, 3d44p and 3d34s4p configurations. The present results considerably expand the existing data sets for Cr II, allowing a more detailed treatment of the available measured spectra from different space observatories.
Electron impact excitation of the 4 1S0-4
1P1
state of Zn atom
Authors: Xie L Y , Cheng X S , Zhang D H , Jiang J , Wu Z W , Dong C Z 
Published: June 2020

Synopsis
The electron impact excitation total and differential cross sections, Stokes parameters, and coherence pa-rameters of Zn atom from the ground state 41S0 to the excited state 41P1 were systematically calculated using the fully relativistic distorted wave method. The calculated results are compared with the experimental data and other theoretical results, good agreement is obtained.
Post-collision interaction in sequential double-ionization of helium
Authors: Artemyev A N , Streltsov A I , Demekhin Ph V 
Published: June 2020

Synopsis
We investigate the post-collision interaction between a slow electron released by a pump pulse from the neutral helium atom and a fast electron released by a time-delayed probe pulse from the created ion. To this end, we numerically solve the time-dependent Schrödinger equation in the basis of the essential eigenstates of the unperturbed Hamiltonian. We demonstrate that the energy exchange between the slow and the fast electrons and the recapture of slow photoelectrons can be controlled by the properties of the pulse-sequence.
Spectroscopy and photoionization of C+ ions by the relativistic eigenchannel R-matrix method
Authors: Yue X F , Jin R , Feng H R , Jiao M C , Gao X , Li J M 
Published: June 2020

Synopsis
The scattering matrices of C+ are calculated by using our relativistic eigenchannel R-matrix method. With the merits of the analytical continuation properties of the scattering matrices, lots of atomic dynamical data with accuracy are obtained. Much physical quantities are acquired by applying the multichannel quantum defect theory (MQDT) procedure. The present calculated results are in good agreement with the available experimental data, which has been shown by the newly proposed projected high dimensional quantum defect graph (symmetrized), namely JHANGZ plot.
Experimental and theoretical study of singly ionizing 1-MeV p+He collisions at different energy and momentum transfer values
Authors: Chuluunbaatar O , Kouzakov K A , Zaytsev S A , Zaytsev A S , Shablov V L , Popov Yu V , Gassert H , Waitz M , Kim H-K , Bauer T , Laucke A , Müller Ch , Voigtsberger J , Weller M , Rist J , Pahl K , Honig M , Pitzer M , Zeller S , Jahnke T , Ph L , Schmidt H , Schmidt-Böcking H , Dörner R , Schöffler M S 
Published: June 2020

Synopsis
We present ultra-high-resolution COLTRIMS data on single ionization of helium induced by 1 MeV proton impact and compare it with theoretical calculations. Our analysis clearly shows the limitations of the first Born approximation.
General formula of shakeup and shakeoff probabilities for arbitrary shells
Authors: Mukoyama T 
Published: June 2020

Synopsis
General expressions for the shakeup and shakeoff probabilities following sudden change in central potential have been obtained for arbitrary atomic shells by the use of nonrelativistic hydrogenic wave functions. The final formulae are given in terms of Gauss-type hypergeometric functions. The obtained results are used to calculate the shakeup and shakeoff probabilities for outer-shell electrons following β−decay.
Robust transverse structures in rescattered photoelectron wavepackets and their consequences
Authors: Bredtmann T , Patchkovskii S 
Published: June 2020

Synopsis
Initial-state symmetry has been under-appreciated in strong-field spectroscopies, where laser fields dominate the dynamics. We demonstrate numerically that the transverse photoelectron phase structure, arising from the initial-state symmetry, is robust in strong-field rescattering, and has pronounced effects on strong-field photoelectron spectra. Interpretation of rescattering experiments need to take these symmetry effects into account. In turn, robust transverse photoelectron phase structures may enable attosecond sub-Ångström super-resolution imaging with structured electron beams.
Proton scattering from ground and excited states of atomic hydrogen
Authors: Abdurakhmanov I B , Erkilic O , Alladustov Sh U. , Kadyrov A S , Bray I 
Published: June 2020

Synopsis
The semiclassical two-centre convergent close-coupling approach is applied to study total ionisation, Balmer emission as well as various excitation and electron-capture transitions in proton collisions with the ground and n = 2 states of atomic hydrogen, where n is the principal quantum number. The results for polarisation fraction of the Balmer-α emission induced in p-H(1s) collisions are in good agreement with experiment at intermediate energies, but surprisingly not at higher energies.
Fully differential study of ionization of H2 by p impact near velocity matching
Authors: Dhital M , Bastola S , Silvus A , Hasan A , Lamichhane B R , Ali E , Ciappina M F , Lomsadze R A , Cikota D , Boggs B , Madison D H , Schulz M 
Published: June 2020

Synopsis
Fully differential cross sections (FDCS) for ionization in p + H2 collisions in the region of the electron-projectile velocity matching were measured and calculated. The FDCS were found to be very sensitive to the details of the few-body dynamics underlying the reaction.
A look into the photoionization of medium-sized molecular systems from an XCHEM perspective
Authors: Fernández-Milán P , Klinker M , González-Vázquez J , Martín F 
Published: June 2020

Synopsis
In recent years, the XCHEM methodology has been successfully applied to describe photoionization of many-electron atoms and diatomic molecules. In this communication we present the first application of XCHEM to describe photoionization of medium-sized halomethanes and pyrazine.
N-NO & NN-O bond cleavage dynamics in the N2O2+
Authors: Gope K , Luzon I , Strasser D 
Published: June 2020

Synopsis
N2O Coulomb explosion is initiated by single-photon double ionization with an ultrafast EUV pulse and is probed by delayed near-IR pulses. The competing two- and three-body dissociation dynamics are reflected in the time resolved branching ratios and in the three-body momentum correlation spectra. Channel resolved kinetic energy release spectra exhibit up to a 0.9 eV shift as a function of time delay – interpreted in terms of the long-bond distance difference between the potentials of a Rydberg ion state and its dication core.
Photoionization of H2 using the molecular R-matrix with time approach
Authors: Benda J , Mašin Z , Armstrong G S J , Clarke D D A , Brown A C , Gorfinkiel J D , van der Hart H 
Published: June 2020

Synopsis
We present results of the first calculations using the variational ab initio molecular R-matrix with time approach. We have calculated two and four-photon ionization cross sections for H2 and studied the effects of electron correlation and choice of the Gaussian atomic basis sets. Our results are compared with earlier calculations.
Electron impact ionization of pyrimidine: differential and total cross sections
Authors: Mouawad L , Hervieuxt P-A , Dal Cappello C , Pansanel J , Robert V , El Bitar Z 
Published: June 2020

Synopsis
We provide theoretical cross sections for the ionization of pyrimidine by electron impact. The theoretical framework is based on a quantum approach making use of particular tools to overcome the computing challenges. The developed methodology allows to determine not only the total but also the triple, double and simple differential cross sections. This approach was previously used to calculate the triple differential cross sections of many molecules. Here, we demonstrate that it can be used to calculate more integrated cross sections of a molecule of biological interest: pyrimidine.
A quantum approach to calculate differential and total cross sections for electron impact ionization of molecular targets
Authors: Mouawad L , Hervieux P-A , Dal Cappello C , Pansanel J , Robert V , El Bitar Z 
Published: June 2020

Synopsis
We present a theoretical approach to calculate the cross sections for the ionization of molecules by single electron impact. It is based on the First Born approximation (FBA), describing the ejected electron by a distorted wave (DW). The cross sections are calculated for an average molecular orientation with the proper average method. Single-center molecular wave functions are generated using Gaussian making this method easily applicable to any molecule. We show the calculated cross sections of some molecular targets of varying complexity.
Channel-resolved molecular Auger spectroscopy
Authors: Ablikim U , Forbes R , Bomme C , Osipov T , Xiong H , Bilodeau R , Kilcoyne D , Rudenko A , Holland D M P , Berrah N , Rolles D 
Published: June 2020

Synopsis
Molecular Auger spectra typically consist of many overlapping lines that are hard or impossible to resolve experimentally even with highest-resolution electron spectroscopy techniques. Since molecular Auger energies depend on non-adibatatic dynamics, they can also be difficult to calculate precisely, such that the assignment of molecular Auger transitions is often ambiguous. Here we show that by measuring Auger-electron multi-ion coincidences, we can disentangle the spectra into the contributions from specific ionic final states, which helps significantly with their interpretation and assignment.
Fitting continuum wave functions with complex Gaussians
Authors: Ammar A , Leclerc A , Ancarani L U 
Published: June 2020

Synopsis
One particle atomic and molecular bound functions can be easily fitted with a set of real Gaussian type orbitals (r-GTOs). Here we explore how continuum wave functions such as Bessel, Coulomb or generalized Sturmian functions can be represented by a set of real or complex Gaussian type orbitals (c-GTOs) that can, ultimately, enter a molecular scattering calculation.
Geometrically reconstructing laser Coulomb-exploded molecules
Authors: Singh M D , Ramadhan A , Tian K , Sanderson J , Wales B , Karimi R , Beaulieu S , Liu W K , Kieffer J C , Légaré F 
Published: June 2020

Synopsis
Geometrical reconstructions are performed for Carbonyl Sulfide (OCS) through Coulomb Explosion Imaging (CEI) employing intense femtosecond laser ionization with pulse durations 7 fs, 30 fs, 60 fs, 100 fs, and 200 fs, using two methods that significantly differ in approach. Firstly, a look up table is employed to reconstruct OCS (2, 2, 2) channel and highlight the presence of degenerate regions. Following this a more sophisticated constrained nonlinear optimization approach improves on precision and gives an indication of uncertainty. Results are compared with equilibrium geometry.
Triple Differential Cross Sections for electron impact ionization of methane at intermediate energy
Authors: Granados C , Ali E , Sakaamini A , Harvey M , Ancarani L U , Murray A J , Dogan M , Ning C , Colgan J , Madison D 
Published: June 2020

Synopsis
In a joint experimental and theoretical collaboration, triple differential cross sections are presented for electron-impact single ionization of the 1t2
and 2a1
states of CH4 at an incident electron energy of 250 eV. Experimental data from two different laboratories are compared with molecular 3-body distorted wave (M3DW) and generalized Sturmian function (GSF) calculations. Overall, we find a good experiment-experiment, and also a relatively good experiment-theories, agreement. We observe that for the 1t2
state, similarly to ionization of atomic p-states, the peak is sometimes doubled.
New structures in fully differential cross sections for ionization of He by proton impact
Authors: Dhital M , Bastola S , Silvus A , Hasan A , Lamichhane B R , Ali E , Ciappina M F , Lomsadze R A , Madison D H , Schulz M 
Published: June 2020

Synopsis
Fully differential cross sections (FDCS) for ionization in p + He collisions were measured and calcu-lated for several projectile energy losses. The electron angular dependence of the FDCS reveals structures not seen in previous studies.
Photoionization of water: influence of the initial state representations
Authors: Martini L , Boll Dir , Fojon O A 
Published: June 2020

Synopsis
We study theoretically the photoionization of water molecules by monochromatic linearly polar-ized photons. We elaborated a model in which the final state wavefunctions are given by Coulomb continuum wavefunctions with distorted charges and the bound states are represented by using different wavefunctions. We contrast our calculations for photon energies between 20 and 300 eV with more elaborated theories and experimental results. We achieve a very good agreement with experiments, especially at enough high energies where elaborated results are not available.