bluuebunny/crossref_metadata_2025_split huggingface dataset:
Low energy fragments from O2+ + H2 collisions following single and double electron removal from the target
Authors: Juhász Z , Vizcaino V , Chesnel J-Y , Kovács STS , Herczku P , Demes S , Rácz R , Biri S , Sulik B 
Published: June 2020

Synopsis
Fragmentation of H2 by 20-keV O2+ was studied. A time of flight setup was developed to measure the low-energy fragment ions originating from singly ionized target molecules. High-energy fragments stemming from double electron removal were measured by an electrostatic spectrometer. The contribution of the low-energy fragments is significant but smaller than that of the energetic ones. Though single electron removal is more probable it less likely leads to dissociation. A statistical type model shows a good agreement with the experimental results.
Convergent close-coupling approach to proton collisions with helium
Authors: Alladustov S U , Abdurakhmanov I B , Kadyrov A S , Bray I , Bartschat K 
Published: June 2020

Synopsis
We develop a two-center wave-packet convergent close-coupling approach to proton collisions with helium including electron exchange. The convergence of the final results is studied in terms of the included projectile- and target-centered pseudostates. We present electron-capture and single- and double-ionisation cross sections in the projectile energy range from 15 keV to 1 MeV. We also provide partial cross sections for electron capture and direct excitation into the n = 2 shell states of hydrogen and helium, where n is the principal quantum number of the final state. Our results are in good agreement with available experimental data and other calculations.
Charge exchange UV-Visible and EUV spectroscopy of multiply charged heavy ions
Authors: Numadate N , Yamada Y , Ohna T , Tanuma H 
Published: June 2020

SynopsisTo provide spectroscopic data of multiply charged heavy ions related not only the development of EUV light and soft X-ray sources and also optical measurements of neutron star mergers, charge exchange spectroscopy was performed using an ECR ion source with two spectrometers in EUV and UV-Visible regions.
Jahn-Teller effect among electronic resonant states of H3
Authors: Hedvall P , Larson  
Published: June 2020

Synopsis
The Jahn-Teller conical intersection among the electronic resonant states of H3 is studied. We have performed electron scattering calculations and obtained complex adiabatic potential energy surfaces that we describe using a generalized Jahn-Teller Hamiltonian. The non-adiabatic coupling and the geometric phase were also investigated.
A study of the critical minima and spin polarization in the e-Sr elastic scattering
Authors: Abdullah M N A , Haque A K F , Kumar A , Uddin M A 
Published: June 2020

Synopsis
A complex optical potential (OP) is employed within the framework of the Dirac partial wave method to study the critical minima (CM) in the differential cross sections and the spin polarization for the elastic scattering of electrons by the Sr atom in the energy range Ei
= 1-1000 eV. The complex optical potential is composed of the static, exchange, polarization and absorption potentials. The number of CM points has been found to be 7 in the DCSs of e-Sr scattering, while the number of maximum spin polarization points observed is 13.
Low energy electron mass stopping power in H2
Authors: Zawadzki M , Khakoo M A 
Published: June 2020

Synopsis
We present experimental mass stopping powers of electrons in gaseous H2 obtained with a newly developed electron time-of-flight spectrometer, for the incident electron energy range of 10 eV to 25 eV. In our procedure the average energy loss is derived from our conversion of measured electron time-of-flight spectra into equivalent electron energy loss spectra so as to obtain the values of mass stopping power for electron scattering from H2.
Electron driven scattering studies involving diborane
Authors: Yadav H , Prajapati D , Vinodkumar M , Vinodkumar P C 
Published: June 2020

Synopsis
In the present case we study the electron impact scattering cross sections on diborane (B2H6
) for the energy range 0.1 eV to 5000 eV. The present study provides differential cross sections (DCS), momentum transfer cross sections (MTCS), ionization cross sections and total scattering cross sections (TCS). The experimental determinations of these cross sections are rather difficult dur to its complex structure and stability. These cross sections are important in many applied fields.
EUV spectroscopy of Kr, Y and Mo ions using CoBITs
Authors: Sokell E , Ali S , Kondo T , Monobe M , Ohishi S , Sakaue H A , Nakamura N 
Published: June 2020

Synopsis
CoBITs have been used to produce Kr, Y and Mo ions and EUV spectra have been recorded. The data indicate that the CoBIT spectra are significantly different to laser-produced plasma emission spectra for similar ion stages. This difference is attributed to the different number density of electrons in the two kinds of plasmas. The evolution of the line profiles with electron beam energy for a number of different ions has been studied.
Electron capture to the Rydberg atomic states in ternary collisions with neutral particles
Authors: Narits A A , Kislov K S , Lebedev V S 
Published: June 2020

Synopsis
We report on the results of theoretical comparative studies of different physical mechanisms of free electron capture to the Rydberg atomic states and bound-bound transitions in discharge plasmas of Ne/Xe and Ar/Xe mixtures containing atomic and molecular ions. Particular attention is paid to the role to the resonant non-adiabatic free-bound and bound-bound transitions due to collisions with neutral particles. We show that in a wide range of low-temperature plasma parameters the contribution of resonant processes to the population of low-lying Rydberg states is predominant.
Response of nonequilibrium nonstationary plasma created by intense femtosecond UV laser pulse in rare gases: emission in the THz frequency band
Authors: Bogatskaya A V , Popov A M 
Published: June 2020

Synopsis
We analyse the response of the current in plasma created in the process of gas ionization by an intense UV laser pulse in the terahertz frequency band. Our consideration allows us to take into account both temporal retardation of the EVDF evolution with respect to the external electric field and the effect of the relaxation of the strongly nonequilibrium EVDF due to elastic electron - atomic collisions The suggested theory enables to properly describe propagation of short and ultra-short THz pulses in laser plasma waveguides.
Electron density diagnosis of laser-produced plasmas based on spectral line broadening of highly charged ions
Authors: Wang K P , Su M G , Cao S Q , Ma P P , Sun D X , Min Q , Dong C Z 
Published: June 2020

Synopsis
Spectral line profile of Ti XII 11.64 nm was measured using spatio-temporally resolved laser-produced plasma technique. The electron density of laser-produced Ti plasmas was calculated based on the spectral line Stark broadening of highly charged ions.
On the probability of close collisions of charged particles with atoms in a crystal
Authors: Kyryllin I V , Shul’ga N F 
Published: June 2020

Synopsis
An investigation on the probability of close collisions of fast charged particles with atoms in a straight and bent crystal was carried out. On the basis of analytical calculation and numerical simulation we analyzed the dependence of this probability from the orientation of the crystal with respect to the direction of fast charged particles motion.
Effect of secondary electron emission on the guiding properties of insulating capillaries
Authors: Giglio E , Tökési K , Dubois R D 
Published: June 2020

Synopsis
The transmission of 1 keV Ar+ ions through a macroscopic glass capillary is simulated by taking explicitly into account the secondary electron (SE) emission generated by ion impacts inside the capillary. The SE emission re-distributes the injected charge in the capillary wall and thus modifies the guiding power of insulating capillaries. Especially for high beam intensities, SE are found to be crucial for explaining the observed time-evolution of the transmitted intensities.
Coherent effect in ionization loss of relativistic electron ensembles in ultrathin targets
Authors: Trofymenko S V , Shul’ga N F 
Published: June 2020

Synopsis
Ionization loss of relativistic electron bunches in ultrathin targets is considered. It is shown that the effect of coherent amplification of ionization loss comparing to Bethe-Bloch result, analogous to such effect in radiation, can take place for sufficiently small bunches with high particle densities. It is demonstrated that such effect can manifest itself for bunch parameters achievable on modern accelerator facilities.
Formation of nanocraters on the surface of gold nanolayer by an impact of highly charged xenon ions
Authors: Stabrawa I , Banaś D , Kubala-Kukuś A , Jabłoński Ł , Jagodziński P , Sobota D , Szary K , Pajek M , Mendyk E , Skrzypiec K , Borysiewicz M 
Published: June 2020

Synopsis
In this work we have systematically studied process of energy deposition and formation of nanostructures on metallic (Au nanolayer) surfaces as a result of the irradiation with slow highly charged xenon ions (HCI). Well pronounced modifications of the surfaces in form of craters were observed. We found that, in the systems considered, the kinetic energy influences the crater depth, while the potential energy affects the crater size at the surface. This finding showed that for gold nanolayers the potential energy plays important role in the nanostructures creation.
Revision of optical property of silicon by a reverse Monte Carlo analysis of reflection electron energy loss spectroscopy spectra
Authors: Yang L H , Tőkési K , Tóth J , Da B , Ding Z J 
Published: June 2020

Synopsis
The energy loss function (ELF) of silicon in a wide photon energy region (0-200 eV) was derived from reflection electron energy loss spectroscopy spectra with a theoretical analysis of the measured data. The accuracy of our result was justified by using the f- and ps-sum rules. Based on the new ELF, individual contributions of surface excitation and the bulk excitation to the REELS spectrum have been separated, and multi-scattering effect in the reflection electron energy loss spectroscopy spectrum has been studied in detail.
Deepening into the nucleation and fission processes of nano-hydrated ammonia clusters - a combined theoretical and experimental study
Authors: Barreiro D , Oostenrijk B , Walsh N , Sankari A , Månsson E P , Maclot S , Sorensen S , Díaz-Tendero S , Gisselbrecht M 
Published: June 2020

Synopsis
While largely studied in the macroscopic scale, the dynamics leading to the nucleation and fission of atmospheric aerosols are very poorly understood at the nano or molecular scale. A model system consisting on ionized hydrogen-bonded ammonia and water molecules have been studied experimentally using mass- and 3D momentum spectroscopy and theoretically using ab initio molecular dynamics simulations.
Resonance electron interaction with heterocyclic compounds: vibrational Feshbach resonances and hydrogen atom stripping
Authors: Pshenichnyuk S A , Fabrikant I I , Modelli A , Ptasmska S , Komolov A S 
Published: June 2020

Synopsis
We present studies of low-energy resonance electron attachment in a series of 5-membered heterocyclic rings under gas-phase conditions by means of electron transmission spectroscopy and dissociative electron attachment spectroscopy.
Simulation of single cell irradiation by proton beams using TILDA-V
Authors: Alcocer-Ávila M E , Quinto M A , Monti J M , Weck P F , Fojón O A , Rivarola R D , Champion C 
Published: June 2020

Synopsis
The purpose of the present work is to emphasize the need for realistic modeling of the biological medium when studying the transport of protons in living matter at the very small scale. In this context, we have used the TILDA-V Monte Carlo track-structure code to simulate the irradiation of single cells with proton beams over the energy range of 10 keV – 100 MeV.
Electron emission induced by Helium ions on water molecule
Authors: Quinto M A , Monti J M , Champion C , Rivarola R D 
Published: June 2020

Synopsis
This study focuses on the electron emission induced by He ions on water molecule. In this context, the ionization and the electron capture processes will be investigated using a quantum mechanical description within the continuum distorted wave-eikonal initial state (CDW-EIS) approximation.
Positronium formation in positron-helium collisions in Debye plasma
Authors: Wang Y C , Ma J , Jiao L G , Zhou Y J 
Published: June 2020

Synopsis
Positronium formation processes in positron-helium collisions with Debye potentials are studied using the screening approximation model in incident energy range from the threshold to 100 eV for screening parameters μ=0.00-0.25.
Theoretical analysis of the binding of a positron to acetaldehyde molecule
Authors: Dohi K , Tachikawa M , Kita Y 
Published: June 2020

Synopsis
We theoretically analyzed the positron affinity (PA) of acetaldehyde molecule at several vibrational excited states toward the elucidation of physical and chemical origin of H/D isotope shift in the molecular PA value. We found that (i) the acetaldehyde molecule has different PA values and its H/D isotope shift for each vibrational state, and (ii) H/D isotope shift in the PA values at vibrational excited states are mainly due to the change in the dipole moment by the vibrational excitations.
Atomic physics research at HIAF and future perspective
Authors: Ma X , Wen W Q , Zhan S F , Huang Z K , Wang H B , Yang J , Zhu X L , Yu D Y , Cheng R , Mao L J , Yang J C , Sheng L N , Zhou X H , Xu H S , Yuan Y J , Xia J W , Zhao H W , Xiao G Q , Zhan W L 
Published: June 2020

Synopsis
A brief introduction to the undergoing HIAF projects in China is given, and the scientific goals as well as the atomic physics programs are discussed. A new science center in the Gulf area near Hongkong will pro-vide unprecedented opportunities for novel scientific researches based on large scale facilities.
Time-dependent effective potential for the ultrafast correlated electron dynamics of molecules in intense laser fields: Application to anisotropic ionization of CO
Authors: Kono H , Ohmura S , Kato T , Ohmura H , Koseki S 
Published: June 2020

Abstract
By using the multiconfiguration time-dependent (TD) Hartree-Fock (MCTDHF) method, we simulated the multielectron dynamics of a CO molecule irradiated by near-IR two-cycle pulses with different carrier envelope phases. The ionization rate calculated is higher when the laser electric field
ε
(t) points from the nucleus C to O than the opposite case, in agreement with the results of two-color ionization experiments. The mechanism of anisotropic tunnel ionization in CO was examined by converting the obtained multielectron dynamics to the representation in terms of TD natural orbitals {ϕj
(t)}. Within the framework of MCTDHF, we derived the unitary equations of motion for {ϕj
(t)}. From the derived equations, we defined the TD effective potentials

{

υ
j

eff

(
t
)

}

that govern the dynamics of {ϕj
(t)}. In

υ

5
σ

eff

(
t
)

for the 5σ HOMO, a narrow hump that originates from two-body electron-electron repulsion is formed on the top of the field-induced distorted barrier near the nucleus C when
ε
(t) points from C to O, which is responsible for the directional anisotropy of tunnel ionization. For 4σ HOMO-2, a high barrier to suppress ionization is formed in

υ

4
σ

eff

(
t
)

when
ε
(t) points from C to O, in correlation with the electron-electron interaction with a 5σ electron on route to ionization. For the opposite phase,

υ

4
σ

eff

(
t
)

becomes barrierless, which enhances high-harmonic generation through ϕ
4σ(t).
Angle-resolved RABBITT : from atoms to molecules
Authors: Joseph J , Holzmeier F , Bresteau D , Spezzani C , Ruchon T , Hergott J F , Tcherbakoff O , D’Oliveira P , Lucchese R R , Houver J C , Carré B , Dowek D 
Published: June 2020

Synopsis
We report recent results of photoelectron angular distributions (PADs) for photoionization (PI) of atomic and molecular targets, resolved in the time domain at the attosecond scale, combining electron-ion coincidence momentum spectroscopy and the RABBITT scheme. We propose a unified formalism synthetizing the PAD(θ, τ) results in terms of a reduced set of coefficients.
Semiclassical interference in photoelectron spectra: Holographic structures
Authors: López S D , Arbó D G 
Published: June 2020

Synopsis
We theoretically investigate on the holographic structure in doubly differential momentum distribution for atomic photoionization. We use the ab initio solution of the time dependent Schrödinger equantion and the two-step semiclassical model. We see how the holographic structures are formed due to the interference of the direct trajectories of electrons and the rescattered trajectories of electrons. We get rid of intra- and intercycle interferences by removing ionization in the second half of a one-cycle pulse.
Opto-optical modulator (OOM) for extreme ultraviolet pulses
Authors: Olofsson A , Simpson E R , Labeye M , Camp S , Ibrakovic N , Bengtsson S , Schafer K J , Gaarde M B , Mauritsson J 
Published: June 2020

Synopsis
There is a profound, almost symbiotic relation between electrons and photons. When light interacts with matter the electrons in the material will start to move and oscillate. When a charged particle, such as an electron, oscillates it will act as a dipole and emit light. We utilize this symbiotic relation and extend the control of light to the extreme ultraviolet (XUV) region using the newly developed XUV opto-optical modulator.
Analytical theory of attosecond transient absorption spectroscopy of perturbatively dressed systems
Authors: Kolbasova D , Santra R 
Published: June 2020

Synopsis
The current work provides an elementary explanation of the signals one can obtain in attosecond transient absorption experiments. We perform a perturbative analysis of the transient absorption signal as a function of the time delay between the excitation pulse and the dressing pulse. We discuss an unusual kind of experiment, where the information is gained from the absorption spectrum of an attosecond XUV pump pulse, and the probe pulse gives a reference time, allowing to measure the time evolution of a system. We illustrate our concepts through numerical calculations for a model atom.
High-harmonic generation enhanced by dynamical electron correlation
Authors: Li Y , Sato T , Ishikawa K L 
Published: June 2020

Synopsis
We theoretically investigate correlated electron dynamics in high-harmonic generation (HHG), using all-electron ab initio simulations for three-dimensional real alkali-metal atoms. The resulting harmonic spectra exhibit a plateau extended beyond the usual cutoff and a prominent resonance peak, which are clear manifestations of dynamical electron correlation.
Attosecond photoionization dynamics around Ar Cooper minimum
Authors: Lejman M , Alexandridi C , Turconi M , Barreau L , Platzer D , Borot A , Hergott J-F , Tcherbakoff O , Salières P 
Published: June 2020

Synopsis
Photoionization time delays between the 3s and 3p subshells of argon have been measured over a large energy range (35-70eV) covering the Cooper minima in both subshells, providing stringent tests for interchannel correlation theories.
Controlling sub-cycle instantaneous optical chirality in the photoionization of chiral molecules
Authors: Rozen S , Comby A , Beauvarlet S , Bloch E , Fabre B , Blanchet V , Descamps D , Petit S , Pons B , Dudovich N , Mairesse Y 
Published: June 2020

Synopsis
Photoionization of chiral molecules by circularly polarized light produces characteristic photoelectron angular distributions, showing a strong forward/backward asymmetry with respect to the light propagation axis. Up to now, this process, referred to as Photoelectron Circular Dichroism, has been studied using electric fields with constant ellipticity over the optical period. In this work, we show numerically and experimentally that the chiroptical photoelectron asymmetry can be controlled by engineering the subcycle instantaneous ellipticity and chirality of the ionizing electric field.
Polarization of attosecond pulses generated by two-color laser fields
Authors: Zhu M F , Wang G L , Zhao S F , Li X Y , Zhou X X 
Published: June 2020

Synopsis
We propose a circular-elliptical laser field, which consists of a circularly polarized field with its copla-nar counter-rotating elliptical third harmonic pulse, to generate polarized high-order harmonics and attosecond pulses (APs) by He atom. We show that the polarization of APs depends evidently on the ellipticity ξ of harmonic laser field. Most importantly, nearly circular APs can be obtained with a proper ξ. Our results contribute to the generation of high elliptically polarized APs with s-state atom.
Comparison of strong field approximation and quantitative rescattering model in generating of attosecond pulse
Authors: Li X Y , Fan J , Wang X L 
Published: June 2020

Synopsis
In this paper, we want to investigate the differences between strong field approximation (SFA) and quantitative rescattering (QRS) model in macroscopically generating attosecond pulse. Our research shows that SFA can give comparable results to that from time-dependent Schrödinger equation (TDSE) in the cut-off range, but it encounters difficulties in reproducing the attosecond pulse of TDSE’s in the low frequency range. However, the results from QRS agree well with that from TDSE method.
Correlation drives a strong attractive force on plasmonic photoelectrons
Authors: Magrakvelidze M , Madjet M E , Chakraborty H S 
Published: June 2020

Synopsis
We show that the dynamical electron correlation suppresses the dipole field of incoming photon while inducing a strong attractive force at the spectral region of the giant plasmon resonance of C60. A signature of this force is seen in the form of a binding well in the imaginary part of the induced potential. This attraction can significantly influence the emerging photoelectron’s temporal delay behavior.
Numerical attoclock on atomic and molecular hydrogen
Authors: Serov V , Bray A W , Kheifets A S 
Published: June 2020

Synopsis
We simulate attosecond angular streaking on atomic and molecular hydrogen by solving the time-dependent Schrödinger equation (TDSE) driven by a single oscillation circularly polarized laser pulse. We compare results for this simulated “numerical attoclock” with predictions of a semiclassical model based on the saddle point method (SPM). This way we identify the essential physics behind the attoclock measurements. In molecular hydrogen, we observe a strong dependence of the width of the attoclock angular peak on the molecular orientation and attribute it to the two-center electron interference. See Ref. [1] for full detail.
Generation of attosecond pulses in “water window” range by a plasma-based X-ray laser
Authors: Khairulin I R , Antonov V A , Kocharovskaya O 
Published: June 2020

Synopsis
We suggest a technique to generate a train of attosecond pulses in “water window” range by hydrogen-like C5+ plasma-based X-ray laser with two sequentical active plasma channels irradiated by two different optical laser fields with orthogonal polarizations. We show also the possibility to transform the radiation of a plasma-based X-ray laser dressed by an optical laser field into a train of attosecond pulses in a resonant absorber irradiated by the different optical field.