Rb-N_2(He)蒸气室压强及He、N_2气渗漏测量
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摘要
利用原子吸收及谱线增宽方法测量了Rb-N_2(He)蒸气室中的气体压强.对Rb-N_2(He)蒸气室中的气体渗漏进行了检测,实验发现:对N_2气几乎观察不到明显的渗漏现象.对于Rb-He950torr的高压蒸气室60天后的气体渗漏量为19%,渗漏比较明显.测量了223-638torr范围Rb-N_2蒸气室的5P_(3/2)—5P_(1/2)精细结构碰撞转移截面.结果表明,随着温度升高,碰撞转移截面值也升高,温度为50℃、60℃、70℃时,碰撞转移截面分别为(1. 03±0. 32)×10~(-16)cm~2、(1. 36±0. 38)×10~(-15)cm~2、(8. 96±1. 02)×10~(-15)cm~2.压强在638torr时,碰撞转移截面随着温度升高增加较快,70℃以后碰撞转移截面迅速增加.
Using the atomic absorption and spectral line widening procedure,the gas pressure in a Rb-N_2( He)vapor chamber was measured. The gas permeation in the chamber was also evaluated. In the experiment,we found that no obvious permeation can be observed in the N_2 gas. For the Rb-He vapor chamber with the high pressure of 950 torr for 60 days,the permeation of gas is measured as 19% and the leakage is deduced to be obvious. The cross sections of 5P_(3/2)– 5P_(1/2) fine structure collision transfer are measured for the vapor chamber with the Rb-N_2 pressure of 223-638 torr. The results reveal that the collisional transfer section increases with the temperature. When the Rb-N_2 pressure is 638 torr,the collision transfer cross sections are( 1. 03 ± 0. 32) ×10~(-16) cm~2,( 1. 36 ± 0. 38) × 10~(-15) cm~2,and( 8. 96 ± 1. 02) × 10~(-15) cm~2 with the temperature of 50℃,60℃,and 70℃,respectively. It has been demonstrated that the collision transfer section rapidly increases with the temperature when the temperature is higher than 70℃.
Using the atomic absorption and spectral line widening procedure,the gas pressure in a Rb-N_2( He)vapor chamber was measured. The gas permeation in the chamber was also evaluated. In the experiment,we found that no obvious permeation can be observed in the N_2 gas. For the Rb-He vapor chamber with the high pressure of 950 torr for 60 days,the permeation of gas is measured as 19% and the leakage is deduced to be obvious. The cross sections of 5P_(3/2)– 5P_(1/2) fine structure collision transfer are measured for the vapor chamber with the Rb-N_2 pressure of 223-638 torr. The results reveal that the collisional transfer section increases with the temperature. When the Rb-N_2 pressure is 638 torr,the collision transfer cross sections are( 1. 03 ± 0. 32) ×10~(-16) cm~2,( 1. 36 ± 0. 38) × 10~(-15) cm~2,and( 8. 96 ± 1. 02) × 10~(-15) cm~2 with the temperature of 50℃,60℃,and 70℃,respectively. It has been demonstrated that the collision transfer section rapidly increases with the temperature when the temperature is higher than 70℃.
引文
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[3] Zhdanov B V,Knise R J. Laser diode array pumped continuous wave Rubidium vapor laser[J]. Optics Express,2008,16:748.
[4] Cheng H,Wang Z,Zhang F,et al. Research development of alkali vapor lasers[J]. Laser&Optoelectronics Progress,2015,52:020002(in Chinese)[成洪玲,王志敏,张丰丰,等.碱金属蒸气激光器的研究进展[J].激光与光电子学进展,2015,52:020002]
[5] Zweiback J,Krupke W F. 28W average power hydrocarbon free rubidium diode pumped alkali laser[J].Optics Express,2010,18:1444
[6] Liu Qiang. System design of all optical Cs atomic magnetometer[D]. Harbin Engineering University,2012(in Chinese)[刘强.全光铯原子磁力仪系统设计[D].哈尔滨工程大学,2012]
[7] Vasilakis G. Precision measurements of spin interactions with high density atomic vapors[J]. Dissertations&Theses-Gradworks,2011.
[8] Scheidegger A E. The physics of flow through porous media[M]. Trans. Wang H X,Zhang C C,Sun S C.Beijing:Petroleum Industry Press,1982.(in Chinese)[薛定谔A E.多孔介质中的渗流物理[M]王鸿勋,张朝深,孙书深,译.北京:石油工业出版社,1982.]
[9] Yao J Q,Zhang Y,Hou F Y,et al. Temperature dependence of Rb D2line in saturation spectroscopy[J].J. At. Mol. Phys.,2008(in Chinese)[姚景芹,张尧,侯飞雁,等.温度对铷原子D2线饱和吸收光谱的影响[J].原子与分子物理学报,2008,25:1057]
[10] Couture A H,Clegg T B,Driehuys B. Pressure shifts and broadening of the Cs D1and D2lines by He,N2,and Xe at densities used for optical pumping and spin exchange polarization[J]. J. Appl. Phys.,2008,104:187.
[11] M. V. Romalis,E. Miron,G. D. Cates. Pressure broadening of Rb D1and D2lines by3He,4He,N2,and Xe:Line cores and near wings[J]. Phys. Rev. A,1997,56:4569.
[12] Norton,F J. Permeation of gases through solids[J].J. Appl. Phys.,1957,28:34.
[13] Wang S Y,Fan W X,Gao Y M,et al. Vibrational to rotational energy transfer in highly vibrationally excited Li Cs-CO2collisions.[J]. J. At. Mol. Phys.,2017,34:678(in Chinese)[王淑英,范雯萱,高永明,等.高振动激发Li Cs与CO_2碰撞中的振动-转动能量转移[J].原子与分子物理学报,2017,34:678]
[14] LüL,Li L,Deng Y H,et al. Measurement of finestructure branching ratios for Rb-He optical collisions.[J]. Spectrosc. Spect. Anal.,2009,29:1732(in Chinese)[吕磊,李琳,邓玉华,等. Rb-He光学碰撞中精细结构分支比的测量[J].光谱学与光谱分析,2009,29:1732]