Chinese Journal of Quantum Electronics, Volume. 24, Issue 6, 683(2007)
Radiation and collisional transfer of excitation energy in Cs(6P)atoms mixed with Ne
Using the CW laser absorption and fluorescence method,the cross sections for the fine structure mixing and quenching of the Cs(6P)state,induced by collision with Ne atoms,were measured. Cesium atoms were optically excited to the 6P3/2 state. The excited atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single mode laser beam,tuned to the 6PJ →8S1/2 transitions. The effective radiative rates were calculated for the 6PJ → 6S transitions. The fluorescence intensity I895 of the sensitized 6P1/2 →6S1/2 emission was measured as a function of Ne density in the range 0.5 × 1018 < N <4 × 1018 cm-3 at constant temperature T=337 K. It was found that the quantity N/I895 exhibited a parabolic dependence on N,confirming that the quenching of the 6PJ states is due to collision with Ne atoms,not with Cs ground state atoms. The. coefficients of the second-order polynomial fitted through the measured data yielded the cross sections σ21 =(1.90± 0.82)x 10-19 cm2 and σD =(8.97±3.85)× 10-19 cm2 for the 6PJ fine-structure mixing and quenching,respectively,due to collision with Ne atoms.
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QIN Chen, LIU Jing, WANG Qian, MENG Fan-xin, DAI Kang, SHEN Yi-fan. Radiation and collisional transfer of excitation energy in Cs(6P)atoms mixed with Ne[J]. Chinese Journal of Quantum Electronics, 2007, 24(6): 683
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Received: Jan. 5, 2007
Accepted: --
Published Online: Jun. 7, 2010
The Author Email: Jing LIU (xdlj@xju.edu.cn)
CSTR:32186.14.