Eur. Phys. J. D (2016) 70: 139
https://doi.org/10.1140/epjd/e2016-60734-4

Regular Article

Pressure broadening and shift of K D₁ and D₂ lines in the presence of ³He and ²¹Ne

¹ School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing 100191, P.R. China
² Science and Technology on Inertial Laboratory, Beihang University, Beijing 100191, P.R. China

^a e-mail: lirujie@buaa.edu.cn

Received: 29 December 2015
Received in final form: 13 March 2016
Published online: 16 June 2016

Abstract

Due to the collisions with alkali-metal atoms, the buffer gases used in spin-exchange optical pumping systems induce a broadening of spectral profiles and a shift in the resonance frequency. Here we report the pressure broadening and shift rates of K D₁ and D₂ lines in the presence of ²¹Ne for the first time and values for ³He have been reinvestigated by means of laser absorption spectroscopy. We have also examined the temperature dependence of these collisional effects in a range of 435–458 K. A comparison for the broadening and shift rates to those of other isotopes, ⁴He and ²⁰Ne, is presented.