کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5429003 | 1397329 | 2012 | 6 صفحه PDF | دانلود رایگان |
We have measured the cross section for the disorientation of excited 6p2P1/2133Cs atoms by collisions with ground state Ar atoms by optical-optical double resonance circular polarization spectroscopy. Circular polarization spectra were measured for the 6s2S1/2â 6p2P1/2â 10s2S1/2 transition. Orientation was optically induced in the 2P1/2 state by circularly polarized light. A polarization degree was measured when two pulsed lasers were circularly polarized with the same helicities and opposite helicities, respectively. The intensity of the cascade fluorescence signal, monitored from the 9p2P1/2â 6s2S1/2 transition at 361.73Â nm, was analyzed in the presence of Ar pressures ranging from 7Â mbar to 133Â mbar. This is a direct measure of the importance of the orientation to inelastic process in alkali rare-gas collisions. A disorientation cross section value of 9.25 (1.4)Â Ã 2 was extracted from the measurements. Our result is in good agreement with the theoretical and experimental predictions within the error limits.
⺠Measured orientation-dependent circular polarization spectrum. ⺠Measured collisional cross section of the J=12 excited cesium atoms in collision with argon atoms. ⺠Experimentally investigate the orientation-dependent inelastic process in alkali rare-gas collisions. ⺠Used the first time a two-step pump-probe laser technique to make such measurements.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 113, Issue 16, November 2012, Pages 2066-2071