Hyperfine dipole-dipole broadening of selective reflection spectroscopy at the gas-solid interface

Abstract

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.

Determination of atomic density and collisional broadening of an alkali vapor by resonant interferometry

“…We compare the obtained rate with values reported in the literature in table 1. Our value is in agreement with experimental references [4,8] and is lower than older [2,6,[20][21][22][23]. As mentioned before [4,9] the determination of the atomic density based on the reservoir temperature leads to inaccurate values.…”

“…Here, the region probed for the collisional width determination is closer to resonance than the Weisskopf frequency, thus, our work is in the impact approximation regime. The collisional rate measured in this work is in agreement or slitly smaller than previous measurement in the impact regime [4,6,8]. The measured rate is smaller than those obtained previously in the quasi-static regime [2,[20][21][22][23].…”

“…β ´-( ) 10 8 Hz cm 3 Experimental This work 9±1 Chen and Phelps [20] 15.1±0.6 (14.0 ± 0.5) Gregory [21] 14.5 (13.5) Niemax and Pichler [22] 17±2 (15 ± 2) Niemax et al [2] 12.6±4 (11.7 ± 3.5) Akul'shin et al [6] 11.5±0.12 (11±0.11) Jabbour et al [4] 10.52±1.7 (10.0 ± 1.6) Jabbour et al [4] 10.9±1.7 (10.4 ± 1.6) Meng et al [8] 10.7 (10.0) Theoretical Reck et al [23] 12.4 Carrigton et al [24] 7.52 line and the impact approximation in the line center [1,4]. The limit between those two limits is the Weisskopf frequency that is around 6 GHz for Cs D 2 line [4].…”

“…Those transmission techniques are efficient for low optical densities (low atomic densities [3], large detuning from line center [2] or low thickness sample [5]) since total absorption occurs at higher densities values. Reflection techniques like frequency modulated selective reflection also produces sub-Doppler structures and are adequate for broadening measurement at high optical densities [6][7][8].…”