Pressure broadening and shift of the cesium ${D}_{1}$ transition by the noble gases and ${\text{N}}_{2}$, ${\text{H}}_{2}$, HD, ${\text{D}}_{2}$, ${\text{CH}}_{4}$, ${\text{C}}_{2}{\text{H}}_{6}$, ${\text{CF}}_{4}$, and $^{3}\text{H}\text{e}$

Pressure broadening and shift of the cesium $D_{1}$ transition by the noble gases and $N_{2}$ , $H_{2}$ , HD, $D_{2}$ , ${CH}_{4}$ , $C_{2} H_{6}$ , ${CF}_{4}$ , and ${}^{3}H e$

Greg A. Pitz, Douglas E. Wertepny, and Glen P. Perram

Phys. Rev. A 80, 062718 – Published 21 December 2009

Abstract

The pressure broadening and shift rates for the cesium $D_{1}$ $(6 {{}^{2}P}_{1 / 2} \leftarrow 6 {{}^{2}S}_{1 / 2})$ transition with the noble gases and $N_{2}$ , $H_{2}$ , HD, $D_{2}$ , ${CH}_{4}$ , $C_{2} H_{6}$ , ${CF}_{4}$ , and ${}^{3}H e$ were obtained for pressures less than 300 torr at temperatures under $65 ° C$ by means of laser absorption spectroscopy. The collisional broadening rate, $γ_{L}$ , for He, Ne, Ar, Kr, Xe, $N_{2}$ , $H_{2}$ , HD, $D_{2}$ , ${CH}_{4}$ , $C_{2} H_{6}$ , ${CF}_{4}$ , and ${}^{3}H e$ are 24.13, 10.85, 18.31, 17.82, 19.74, 16.64, 20.81, 20.06, 18.04, 29.00, 26.70, 18.84, and 26.00 MHz/torr, respectively. The corresponding pressure-induced shift rates, $δ$ , are 4.24, $- 1.60$ , $- 6.47$ , $- 5.46$ , $- 6.43$ , $- 7.76$ , 1.11, 0.47, 0.00, $- 9.28$ , $- 8.54$ , $- 6.06$ , and 6.01 MHz/torr. These rates have then been utilized to calculate Lennard-Jones potential coefficients to quantify the interatomic potential surfaces. The broadening cross section has also been shown to correlate with the polarizability of the collision partner.