| 光谱学与光谱分析 |
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| Measurement of the Rb[5P3/2(F′=4)] Hyperfine Level Nonradiative Decay Rate Near a Metallic Film with Laser Retrofluoresence Spectroscopy |
| LIU Jing1,2,XIN Jing-tao1,DAI Kang1,SHEN Yi-fan1* |
1. School of Physics, Xinjiang University, Urumqi 830046, China
2. School of Sciences, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract The signals of the hyperfine 85Rb[5P3/2(F′=2，3，4)→5S1／2(F＝3)] transition lines in a diode laser induced retrofluorescence spectrum at the interface between glass and Rb vapor were experimentally identified and investigated. The glass-vapor interface was considered as two distinct regions, a wavelength-thickness vapor layer joined to the surface and a more remote vapor region. The first region was analyzed as a spectral filter that annihilates the absorbed photons and the second one as a rich spectral light source. The experimental setup is described. A Rb reference cell (T=293 K) was used. A part of the laser beam scanned the 5S1／2(F＝3)→5P3／2(F′＝2，3，4) transition. The Doppler broadened absorption profile (FWHM=510 MHz) was determined. The laser detuning of the profile-center relative to the F=3→F′＝4 transition was about 70 MHz. Another laser beam was directed to the entrance cell window. The resonant retrofluorescence Sob(νL) as a function of laser detuning for a cell temperature ～130 ℃ and laser power 0.4 mW was obtained. We can extract the experimental signal snexP(νL) originating from the near-field region by subtracting signal ST(νL) originating from the far-field region from the total experiment signal Sob(νL). A fit of the normalized profile of the data corresponding to the spectral band centered on the F′＝4→F＝3 hyperfine transition line was obtained by using a Lorentzian distribution function with ΓRF＝50 MHz full width at half-maximum. The role played by different relaxation processes contributing to the retrofluorescent atomic linewidth was characterized. The authors summed up the corresponding spectral broadening and obtained the relation ΓRF＝Γn+Γcoll+Γnr,where Γcoll is the resonance collisional broadening of the hyperfine line, and Γnr is an additional broadening induced by the nonradiative energy-transfer phenomena of the excited atoms near the cell window surface. To evaluate Γcoll,we used the relation Γcoll＝γRb-RbN, where γRb-Rb is line broadening parameter, and N is Rb atom number density. The effective nonradiative relaxation rate of the 5P3／2(F′＝4) energy hyperfine level was estimated to be AnrF′＝4→F＝3＝2.4×108 s-1. The value of Anr seems relatively large compared to the spontaneous emission rate A(5P3/2→5P1/2)＝1.4×107 s-1.
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Received: 2007-10-02
Accepted: 2008-01-06
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Corresponding Authors:
SHEN Yi-fan
E-mail: shenyifan01@xju.edu.cn
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