光谱学与光谱分析 |
|
|
|
|
|
Measurement of Fine-Structure Branching Ratios for Rb-He Optical Collisions |
Lü Lei, LI Lin, DENG Yu-hua, ZHANG Yan-wen, DAI Kang, SHEN Yi-fan* |
School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China |
|
|
Abstract Experimental ratios of branching in the fine-structure levels of the Rb5P multiplet, as a consequence of an optical collision with He, are reported. The process studied is Rb(5S1/2)+He+hν→Rb(5PJ)+He, where the pulsed laser frequency ν is tuned in the wings of the Rb resonance transitions. The authors defined the detuning Δ to be ν-ν(D2)(Δ>0) for laser frequency ν highter than that of RbD2 transition and to be ν-ν(D1)(Δ<0) for ν lower than the RbD1 transition. As RbHe molecular states are correlated to the two 5 2PJ states, there is some likelihood that the molecule will dissociate into 5 2P1/2 or 5P3/2 state. The dissociation results in a nonuniform distribution of atomic Rb5PJ states. The branching ratios are defined as n1/n2, where n1 and n2 are densities of the 5P1/2 and 5P3/2 states dissociated. To determine experimentally the relative cross section for scattering into the two fine-structure states, the relative time-intergrated intensities of the resulting Rb emission lines, I(5P3/2→5P1/2)[I(D2)] and I(5P1/2→5P3/2)[I(D1)] , were measured. The ratios are determined by detunings from about 200 cm-1 in the blue wing to -180 cm-1 in the red wing of the Rb5P multiplet. A rate equation analysis of the pressure dependence was yielded. The branching ratios and cross sections for collisional 5P1/2→5P3/2 transition were obtained from the slope and intercept. The blue-wing branching ratios show a detuning-dependent approach to limit of 0.2. The branching was found to be very large (~40) in the red wing, irrespective of the detuning. Fine structure changing cross section (1.1±0.3)×10-17 cm2 was measured from wing excitation, and the result is consistent with the cross section obtained from resonant excitation of the Rb5PJ state. The measurements show a strong sensitivity to interatomic potentials and to nonadiabatic effects in dissociation dynamics.
|
Received: 2008-05-18
Accepted: 2008-08-22
|
|
Corresponding Authors:
SHEN Yi-fan
E-mail: shenyifan01@xju.edu.cn
|
|
[1] Havey M D, Delahanty F T, Vahala L L, et al. Phys. Rev., 1986, A34(4): 2758. [2] Vahala L L, Julienne P S, Havey M D. Phys. Rev.,1986, A34(3):1856. [3] Goldstein R, Grosser J, Hoffmann O, et al. J. Chem. Phys.,2001, 114(5): 2144. [4] Figl C, Goldstein R, Grosser J, et al. J. Chem. Phys.,2004, 121(22):11068. [5] SHEN Yi-fan, LI Wan-xing(沈异凡,李万兴). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2001,21(1):38. [6] Schaty G C, Hanhel T W, Whiteley W J, et al. J. Phys. Chem., 2003, A107: 7278. [7] Ermers A, Woschnih T, Behmenburg B. Z. Phys., 1987, D5: 113. [8] Grosser J,Hoffmann O, Wischeler F S, et al. J. Chem. Phys., 1999, 111: 2853. [9] Habitg P. Chem. Phys., 1980, 54: 131. [10] Botschwina P, Meyer W, Hertel I V, et al. J. Chem. Phys., 1981, 75: 5438. [11] Theodosiou C E. Phys. Rev., 1984, A30(6): 2881. [12] Gallagher A, Lewis E L. J. Opt. Soc. Am., 1973, 63(7): 864. [13] Gallagher A. Phys. Rev., 1968, 172: 88. [14] Cuvellier J, Fournier P R, Gounand F, et al. Phys. Rev., 1975,A11(3): 846. [15] Vadla C, Knezovic S, Movre M. J. Phys., 1992, B25: 1337. |
[1] |
LEI Hong-jun1, YANG Guang1, PAN Hong-wei1*, WANG Yi-fei1, YI Jun2, WANG Ke-ke2, WANG Guo-hao2, TONG Wen-bin1, SHI Li-li1. Influence of Hydrochemical Ions on Three-Dimensional Fluorescence
Spectrum of Dissolved Organic Matter in the Water Environment
and the Proposed Classification Pretreatment Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 134-140. |
[2] |
XIA Ming-ming1, 2, LIU Jia3, WU Meng1, 2, FAN Jian-bo1, 2, LIU Xiao-li1, 2, CHEN Ling1, 2, MA Xin-ling1, 2, LI Zhong-pei1, 2, LIU Ming1, 2*. Three Dimensional Fluorescence Characteristics of Soluble Organic Matter From Different Straw Decomposition Products Treated With Calcium Containing Additives[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 118-124. |
[3] |
GU Yi-lu1, 2,PEI Jing-cheng1, 2*,ZHANG Yu-hui1, 2,YIN Xi-yan1, 2,YU Min-da1, 2, LAI Xiao-jing1, 2. Gemological and Spectral Characterization of Yellowish Green Apatite From Mexico[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 181-187. |
[4] |
HAN Xue1, 2, LIU Hai1, 2, LIU Jia-wei3, WU Ming-kai1, 2*. Rapid Identification of Inorganic Elements in Understory Soils in
Different Regions of Guizhou Province by X-Ray
Fluorescence Spectrometry[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 225-229. |
[5] |
LIU Wei1, 2, ZHANG Peng-yu1, 2, WU Na1, 2. The Spectroscopic Analysis of Corrosion Products on Gold-Painted Copper-Based Bodhisattva (Guanyin) in Half Lotus Position From National Museum of China[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3832-3839. |
[6] |
WANG Hong-jian1, YU Hai-ye1, GAO Shan-yun1, LI Jin-quan1, LIU Guo-hong1, YU Yue1, LI Xiao-kai1, ZHANG Lei1, ZHANG Xin1, LU Ri-feng2, SUI Yuan-yuan1*. A Model for Predicting Early Spot Disease of Maize Based on Fluorescence Spectral Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3710-3718. |
[7] |
CHENG Hui-zhu1, 2, YANG Wan-qi1, 2, LI Fu-sheng1, 2*, MA Qian1, 2, ZHAO Yan-chun1, 2. Genetic Algorithm Optimized BP Neural Network for Quantitative
Analysis of Soil Heavy Metals in XRF[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3742-3746. |
[8] |
SONG Yi-ming1, 2, SHEN Jian1, 2, LIU Chuan-yang1, 2, XIONG Qiu-ran1, 2, CHENG Cheng1, 2, CHAI Yi-di2, WANG Shi-feng2,WU Jing1, 2*. Fluorescence Quantum Yield and Fluorescence Lifetime of Indole, 3-Methylindole and L-Tryptophan[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3758-3762. |
[9] |
WANG Zhi-qiang1, CHENG Yan-xin1, ZHANG Rui-ting1, MA Lin1, GAO Peng1, LIN Ke1, 2*. Rapid Detection and Analysis of Chinese Liquor Quality by Raman
Spectroscopy Combined With Fluorescence Background[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3770-3774. |
[10] |
YI Min-na1, 2, 3, CAO Hui-min1, 2, 3*, LI Shuang-na-si1, 2, 3, ZHANG Zhu-shan-ying1, 2, 3, ZHU Chun-nan1, 2, 3. A Novel Dual Emission Carbon Point Ratio Fluorescent Probe for Rapid Detection of Lead Ions[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3788-3793. |
[11] |
YANG Ke-li1, 2, PENG Jiao-yu1, 2, DONG Ya-ping1, 2*, LIU Xin1, 2, LI Wu1, 3, LIU Hai-ning1, 3. Spectroscopic Characterization of Dissolved Organic Matter Isolated From Solar Pond[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3775-3780. |
[12] |
QI Guo-min1, TONG Shi-qian1, LIN Xu-cong1, 2*. Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3813-3819. |
[13] |
HE Yan-ping, WANG Xin, LI Hao-yang, LI Dong, CHEN Jin-quan, XU Jian-hua*. Room Temperature Synthesis of Polychromatic Tunable Luminescent Carbon Dots and Its Application in Sensitive Detection of Hemoglobin[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3365-3371. |
[14] |
LIN Hong-jian1, ZHAI Juan1*, LAI Wan-chang1, ZENG Chen-hao1, 2, ZHAO Zi-qi1, SHI Jie1, ZHOU Jin-ge1. Determination of Mn, Co, Ni in Ternary Cathode Materials With
Homologous Correction EDXRF Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3436-3444. |
[15] |
LI Xiao-li1, WANG Yi-min2*, DENG Sai-wen2, WANG Yi-ya2, LI Song2, BAI Jin-feng1. Application of X-Ray Fluorescence Spectrometry in Geological and
Mineral Analysis for 60 Years[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(10): 2989-2998. |
|
|
|
|