Pressure broadening and shift of the cesiumD1transition by the noble gases andN2,H2, HD,D2,CH4,C2H6,CF4, andH3e

Abstract

The pressure broadening and shift rates for the cesium ${D}_{1}$ $(6\text{ }{^{2}P}_{1/2}\ensuremath{\leftarrow}6\text{ }{^{2}S}_{1/2})$ transition with 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 $^{3}\text{H}\text{e}$ were obtained for pressures less than 300 torr at temperatures under $65\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$ by means of laser absorption spectroscopy. The collisional broadening rate, ${\ensuremath{\gamma}}_{L}$, for He, Ne, Ar, Kr, Xe, ${\text{N}}_{2}$, ${\text{H}}_{2}$, HD, ${\text{D}}_{2}$, ${\text{CH}}_{4}$, ${\text{C}}_{2}{\text{H}}_{6}$, ${\text{CF}}_{4}$, and $^{3}\text{H}\text{e}$ 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, $\ensuremath{\delta}$, are 4.24, $\ensuremath{-}1.60$, $\ensuremath{-}6.47$, $\ensuremath{-}5.46$, $\ensuremath{-}6.43$, $\ensuremath{-}7.76$, 1.11, 0.47, 0.00, $\ensuremath{-}9.28$, $\ensuremath{-}8.54$, $\ensuremath{-}6.06$, 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.