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光化学反应中氩气对激发态锂原子猝灭速率研究
Quenching rate of laser-excited lithium atoms with argon molecules in photo chemical reaction
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摘要: 本文对光化学法分离中氩气对2P激发态锂原子的碰撞猝灭速率进行研究.在弱激光作用下，通过对不同氩气压强下的锂原子蒸气吸收光谱和激发态锂原子的荧光发射光谱进行测量，得到氩气对2P激发态锂原子的猝灭速率常数为(12.29±0.92)×10-18 m3·s-1.实验结果表明：在光化学锂同位素分离研究中，氩气对锂原子2P激发态的猝灭速率远小于2P激发态锂原子的自发辐射速率，碰撞猝灭效应对分离选择性的影响非常小，可以忽略不计.Abstract: In this paper, collisional quenching rate for Li(2P ) atoms with argon molecules is studied in photochemical isotope separations. In the weak laser irradiation, the absorption spectra and fluorescence emission spectra of lithium atom vapor is measured by changing the argon pressure. The quenching rate constant of (12.29 ± 0.92) × 10-18 m3·s-1 for Li(2P ) atoms quenched with argon molecules have been determined. This value is much smaller than the spontaneous emission rate of Li(2P ) atoms. The experimental result shows that in photochemical lithium isotope separation collisional quenching effect on the separation selectivity is very small and can be neglected.
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