| 光谱学与光谱分析 |
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| Energy Transfer in Cs(6P)+(Ne, N2) Collisions |
| WANG Shu-ying,SUN Mao-zhu,DAI Kang,SHEN Yi-fan* |
| Department of Physics, Xinjiang University, Urumqi 830046, China |
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Abstract The collisional energy transfer process Cs(6P3/2)+M,where M＝Ne, N2,under gas cell conditions has been investigated. The Cs(6P3/2) state was excited by a diode laser. The direct 6P3/2→6S1/2 fluorescence and the sensitized 6P1/2→6S1/2 fluorescence as a function of quenching gas pressure were measured. For quenching by Ne only energy transfer from the electronic to translational is possible. However, in the N2 case, energy transfer from the electronic to vibrational or rotational is important. Using a two-state rate equation model, the quenching rate coefficients for Cs(6P3/2) were obtained. The fine structure energy transfer rate coefficient for Ne is 1.45×10-12 cm3·s-1. By comparing the relative fluorescence intensities for Ne and N2 case, the authors estimate that the rate coefficient for 6P3/2→6P1/2 transfer in collision with N2 is 1.64×10-12 cm3·s-1. The quenching rate coefficient for the 6P state is 4.88×10-12 cm3·s-1.
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Received: 2006-05-10
Accepted: 2006-08-20
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Corresponding Authors:
SHEN Yi-fan
E-mail: shenyifan01@xju.edu.cn
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