光谱学与光谱分析 |
|
|
|
|
|
Radiation Trapping Effect and Measurement of the Cs(6P3/2) Level Effective Radiation Rate in the Vapor Mixed with He |
SHEN Xiao-yan1,DAI Kang2,SHEN Yi-fan2* |
1. Department of Chemistry, East China University of Science & Technology, Shanghai 200237, China 2. Department of Physics, Xinjiang University, Urumqi 830046, China |
|
|
Abstract The effective radiation rate for Cs(6P3/2) resonance level in the presence of helium was determined. A cell filled with Cs metal and He at pressure PHe (0-500 Pa) was established at T=300 K. The cell was heated in the temperature range between 330 and 370 K, which produced Cs number densities approximately in the range between 1012 and 1013 cm-3. Cs atoms were excited to the 6P3/2 state using a single-mode diode laser(pump laser). The transmission of the medium at the center of the Doppler envelope of the strong h. f. component of the CsD2 line due to hyperfine pumping alone amounts to ≈5%. The assumption that has been made is that the lower-state hyperfine levels are populated in a statistical ratio. The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam (probe laser) tuned to the 6P3/2→8S1/2 transition which could be translated parallel to the pump beam. In the presence of radiation trapping, the spontaneous radiation rate is multiplied by the transmission factor T6P3/2→6S1/2, which describes the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed. The T6P3/2→6S1/2 is related to the frequency dependent absorption cross section and the density and spatial distribution of atoms at the level of the transition. Position dependent 6P3/2 state densities were combined with the collisional broadening rate of 6P3/2←6S1/2 line due to the perturbation of both helium and cesium to yield T6P3/2→6S1/2. The effective radiation rates of the Cs D2 line as a function of the He pressure PHe were obtained. The helium caused line broadening and therefore increased the effective radiation rate. The fluorescence intensity I852 of the T6P3/2→6S1/2 emission was measured simultaneously. The measured fluorescence ratios determined the ratios of the effective radiation rates at different He density. These ratios are in agreement with theoretical evaluation.
|
Received: 2007-06-09
Accepted: 2007-10-24
|
|
|
[1] Vadla C, Horvatic V, Niemax K. Spectrochim. Acta, 2003, B58(7):1235. [2] Correll T L, Horvatic V, Omenetto N, et al. Spectrochim. Acta, 2006, B61:623. [3] LI Yuan-yuan, YIN Gui-qin, DAI Kang, et al(李媛媛, 殷桂琴, 戴 康,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2006, 26(9):1624. [4] Jabbour Z J, Namiotka R K, Huennehens J, et al. Phys. Rev., 1996, A54(2):1372. [5] Namiotka R K, Huennehens J, Allegrini M. Phy. Rev.,1997, A56(1):514. [6] Movre M, Vadla C, Horvatic V. J. Phys. B-At. Mol. Opt. Phys., 2000, 33:3001. [7] WANG Shu-ying, SUN Mao-zhu, DAI Kang, et al(王淑英,孙茂珠,戴 康,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2007,27(6):1044. [8] Jabbour Z J, Sagle J, Namiotha R K, et al. J. Quant. Spectrosc. Radiat Transfer,1995, 54(5):767. [9] Lewis E. Phys. Rep., 1980, 58(1):1. [10] MENG Fan-xin, QIN Chen, DAI Kang, et al(孟繁新,秦 晨,戴 康,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2007,27(12):2393. [11] Mitchell A C G, Zemansky M W. Resonance Radiation and Excited Atoms. New York: Combridge University Press, 1971. 116. [12] Davies J T, Vaughan J M. Astrophysics J., 1963, 137:1302. [13] Theodosiou C E. Phys. Rev., 1984, A30(6), 2881. [14] Smith D A, Hughes I!G. Am. J. Phys., 2004, 72(5):631. [15] Horvatic V, Correll T L, Omenetto N, et al. Spectrochim Acta, 2006, B61: 1260. [16] Czajkowsisi M, McGillis D A, Krause L. Can. J. Phys., 1966, 44:91. [17] Gallagher A. Phys. Rev., 1968, 172:88. |
[1] |
WU Jie1, LI Chuang-kai1, CHEN Wen-jun1, HUANG Yan-xin1, ZHAO Nan1, LI Jia-ming1, 2*, YANG Huan3, LI Xiang-you4, LÜ Qi-tao3,5, ZHANG Qing-mao1,2,5. Multiple Liner Regression for Improving the Accuracy of Laser-Induced Breakdown Spectroscopy Assisted With Laser-Induced Fluorescence (LIBS-LIF)[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(03): 795-801. |
[2] |
WANG Zhao-hui1, ZHAO Yan1, 3, 4*, FENG Chao2. Multi-Wavelength Random Lasing Form Doped Polymer Film With Embedded Multi-Shaped Silver Nanoparticle[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(01): 38-42. |
[3] |
LIU Jing, DAI Kang, SHEN Yi-fan. Resonent Vibration-Vibration Energy Transfer Between Vibrationally Excited HBr (Χ1Σ+ ν″=5) and H2, N2, CO2, and HBr[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(10): 3000-3005. |
[4] |
WAN Xiong, LIU Peng-xi, ZHANG Ting-ting . Research Progress of Supercontinuum Laser Spectroscopy in Biomedical Field [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(02): 338-345. |
[5] |
LI Ren-bing1,2, SU Tie2, ZHANG Long2, BAO Wei-yi2, YAN Bo2, CHEN Li2, CHEN Shuang2 . Study on Line CARS for Temperature Measurement in Combustion Flow Field [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(12): 3968-3972. |
[6] |
WANG Fang1,2, ZHU Han1, LI Yun-peng1, LIU Yu-fang1, 2* . Combined Transmission Laser Spectrum of Core-Offset Fiber and BP Neural Network for Temperature Sensing Research[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(11): 3732-3736. |
[7] |
YAO Lu, LIU Wen-qing, LIU Jian-guo*, KAN Rui-feng, XU Zhen-yu, RUAN Jun, YUAN Song . Measurements of CO2 Concentration Profile in Troposphere Based on Balloon-Borne TDLAS System[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(10): 2787-2791. |
[8] |
FENG Li, LIU Jing, WANG Shu-ying, ZHANG Wen-jun, LI Jia-ling, DAI Kang, SHEN Yi-fan . Time Resolved Distribution of Excitation Energy in Collisions of Vibrationally Excited KH with CO2[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(07): 1758-1762. |
[9] |
ZHANG Wen-jun, FENG Li, LI Jia-ling, LIU Jing, DAI Kang, SHEN Yi-fan* . Vibrational and Rotational Excitation of CO2 in the Collisional Quenching of H2 (v=1) [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(06): 1492-1496. |
[10] |
ZHU Yong-le, WANG Shu-ying, LIU Jing, ZHONG Chong-yu, A·Yolwas, DAI Kang, SHEN Yi-fan* . Transfer Energy Disposal in Collisions of NaK(61Σ+) with H2 [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 884-887. |
[11] |
WEN Zhong-quan, CHEN Gang, PENG Chen, YUAN Wei-qing . Infrared Spectroscopy Based on Quantum Cascade Lasers [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(04): 949-953. |
[12] |
ZHANG Gui-yin1, LI Meng-jun1, JIN Wei-jia2, ZHENG Hai-ming3 . Theoretical Study of 1+2+1 Double-Resonance Multiphoton Ionization Probability [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(01): 44-47. |
[13] |
WANG Shu-ying1, 2, DAI Kang2, LIU Jing1, 2, SHEN Yi-fan2* . Rovibrational State Distributions of H2 in Collisional Energy Transfer between NaK (61Σ+) and H2[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(12): 3183-3187. |
[14] |
DAI Kang1, WANG Shu-ying1,2, LIU Jing1,2, SHEN Yi-fan1*. Vibrational to Rotational Energy Transfer between CsH(X1Σ+,v≥15) and CO2[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 2902-2905. |
[15] |
YANG Wen-liang1, 3, ZHU An-ning1*, ZHANG Jia-bao1, ZHANG Yu-jun2, HE Ying2, WANG Li-ming2, CHEN Xiao-min3, CHEN Wen-chao1 . Use of Open-Path TDL Technique and the Backward Lagrangian Stochastic Model to Monitor Ammonia Emission from Summer Maize Field [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 3107-3111. |
|
|
|
|