Optical-optical double resonance circular polarization spectroscopy: Measurement of the disorientation cross section in 6p²P_1/2 Cs atoms

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• 作者：S.B. Bayram ; D.S. Fisher ; O. Popov ; Z. Sag¡¦lam
• 关键词：Spectroscopy ; Atom&ndash ; atom collisions ; Disorientation ; Inelastic collisions ; Cross section ; Radiative transfer
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：113
• 期：16
• 页码：2066-2071
• 全文大小：319 K

文摘

We have measured the cross section for the disorientation of excited 6p²P_1/2 ¹³³Cs atoms by collisions with ground state Ar atoms by optical-optical double resonance circular polarization spectroscopy. Circular polarization spectra were measured for the 6s²S_1/2 6p²P_1/2 10s²S_1/2 transition. Orientation was optically induced in the ²P_1/2 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 9p²P_1/2 6s²S_1/2 transition at 361.73 nm, was analyzed in the presence of Ar pressures ranging from 7 mbar to 133 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) ?² was extracted from the measurements. Our result is in good agreement with the theoretical and experimental predictions within the error limits.