Hyperfine dipole-dipole broadening of selective reflection spectroscopy at the gas-solid interface
Tengfei Meng, Zhonghua Ji, Yanting Zhao +2 more
We theoretically and experimentally investigate hyperfine dipole-dipole broadening in the selective reflection (SR) spectroscopy at the gas-solid interface with the atomic density of 10 14 –10 15 cm −3 . The two-level SR theory considering pump beam and dipole-dipole interaction between excited-state atom and ground-state atom is presented. The numerical simulation of the SR spectrum is in agreement with experimental results. The reduction of spectral width is observed by introducing a pump beam which is an effective technique to improve the resolution of spectroscopy. We analyze the dependence of dipole-dipole broadening on atomic density and pump beam power. This study is helpful for the description of the SR spectroscopy at the gas-solid interface where the Doppler broadening is comparable with dipole-dipole broadening.
Europhysics Letters (EPL)•Sep 1, 2016•8 citations