DOI: 10.15128/73666479x
title: Absolute absorption on the potassium D lines: theory and experiment

description: Explanations of structure for data files
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Files included in the dataset:
(1) Figure2.xlsx
(2) Figure3.xlsx
(3) Figure4.xlsx
(4) Figure5.xlsx
(5) Figure6.xlsx

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Figure2.xlsx
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This file contains the data used to plots (i), (ii), (iii) and (iv) in Figure 2. 

The columns in the .xlsx file headed with 'energy XX DX' and 'Strength XX DX' refer to the plots (ii) 
and (iv) where the numbers 'XX' refer to the potassium isotopes and 'DX' refers to the transition lines.

The columns in the .xlsx file headed with 'Detuning' and 'Total Transmission DX' refer to plots (i)
and (iii). 'Trans XX F=X DX' refer to the transmission contributions from specific transitions and 
isotopes on the D lines where F=X refers to the particular hyperfine transition.

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Figure3.xlsx
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The columns in the .xlsx file headed with 'I/I_{sat}', 'Min Transmission' and 'Error' refer to the
main figure. 

The columns headed 'Detuning' and 'XXXXX Intensity Trans' refer to the transmission spectra shown in 
the subplot where 'XXXXX' refer to High, medium and low intensities.The column headed 'Weak-probe Trans'
shows the transmission spectra in the weak probe regime. The other columns show the theory and the
residuals.

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Figure4.xlsx
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The columns in the .xlsx file headed with 'Detuning', 'Trans XXXXX Temp DX', 'Trans XXXXX Temp DX Theory'
and 'Trans XXXXX Temp DX Residuals' are the detuning, transmission spectra, transmission spectra theory
and the residuals at a variety of temperatures on the D1 and D2 lines.

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Figure5.xlsx
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This data file has the identical structure to that of Figure2.xlsx but contains data regarding the 
4S - 5P transition.

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Figure6.xlsx
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This data file has nearly the identical structure to that of Figure4.xlsx but also contains data 
regarding the inset and is data from the 4S - 5P transition. 

The columns headed'Isotope Shift' and 'RMS Error' refer to the inset in Figure 6.

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Any problems, contact Ryan Hanley at ryan.hanley@durham.ac.uk.
description: Abstract from article: We present a detailed study of the absolute Doppler-broadened absorption of a probe beam scanned across the potassium D lines in a thermal vapour. Spectra using a weak probe were measured on the 4S - 4P transition and compared to the theoretical model of the electric susceptibility detailed by Zentile et al (2015) in the code named ElecSus. Comparisons were also made on the 4S - 5P transition with an adapted version of ElecSus. This is the first experimental test of ElecSus on an atom with a ground state hyperfine splitting smaller than that of the Doppler width. An excellent agreement was found between ElecSus and experimental measurements at a variety of temperatures with rms errors ~ 10^-3. We have also demonstrated the use of ElecSus as an atomic vapour thermometry tool, and present a possible new measurement technique of transition decay rates which we predict to have a precision of ~ 3 kHz.