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Absolute absorption on the potassium D lines : theory and experiment.

Hanley, Ryan K. and Gregory, Philip D. and Hughes, Ifan G. and Cornish, Simon L. (2015) 'Absolute absorption on the potassium D lines : theory and experiment.', Journal of physics B : atomic, molecular and optical physics., 48 (19). p. 195004.


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 $\to $ 4P transition and compared to the theoretical model of the electric susceptibility detailed by Zentile et al (2015 Comput. Phys. Commun. 189 162–74) in the code named ElecSus. Comparisons were also made on the 4S $\to $ 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 $\sim {10}^{-3}$. 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 ~$3\;\mathrm{kHz}$.

Item Type:Article
Keywords:Potassium vapour, ElecSus, D lines.
Full text:(AM) Accepted Manuscript
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Publisher statement:This is an author-created, un-copyedited version of an article published in Journal of Physics B: Atomic, Molecular and Optical Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
Date accepted:28 July 2015
Date deposited:22 September 2015
Date of first online publication:28 August 2015
Date first made open access:28 August 2016

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