Cs(7DJ)+H2的反应与非反应碰撞转移截面的测定

量子电子学报 , 2008, 25(6): 670-674. doi: 10.3969/j.issn.1007-5461.2008.06.004

Cs(7DJ)+H2的反应与非反应碰撞转移截面的测定

白振岙 ^1, , 崔秀花 ^2, , 赵亿坤 ^3, , 戴康 ^4, , 沈异凡 ^5,

1.新疆大学物理科学与技术学院,新疆,乌鲁木齐,830046

2.新疆大学物理科学与技术学院,新疆,乌鲁木齐,830046;西安交通大学理学院,陕西,西安,710049

3.新疆大学物理科学与技术学院,新疆,乌鲁木齐,830046

4.新疆大学物理科学与技术学院,新疆,乌鲁木齐,830046

5.新疆大学物理科学与技术学院,新疆,乌鲁木齐,830046

基金项目: 国家自然科学基金(10664003)

关键词：光谱学 , 光化学反应 , 泵浦一吸收技术 , 截面 , Cs-H2系统

Experimental evaluation of reactive and nonreactive cross sections in Cs(7D)+H2 collisions

利用激光泵浦一吸收技术,研究了在样品池中的Cs(7DJ)+H2→CsH[X1Σ+(v"=0)]+H光化学反应过程.双光子激发Cs-H2混合蒸气中Cs原子至72D态,荧光中除有泵浦能级发生的直接荧光外,还包含由精细结构碰撞转移产生的敏化荧光,CsH分子足由7D原子与H2间的三体碰撞反应产生的.利用780 nm激光测量了CsHx1∑+(v":0→v'=21)吸收带.△I'和△I"分别表示泵浦7D3/2和7D5/2时的吸收光强.解速率方程组,得到7D3/2→7D5/2和7D5/2→7D3/2精细结构转移截面分别为(1.3±0.3)×10-14和(9.8±2.0)×10-15cm2.从7DJ碰撞到7D以外态的截面分别为(4.0±1.0)×10-15(对J=3/2)和(3.6±0.9)×10-15cm2(对J=5/2).Cs(TDy)+H2→CsH+H的反应截而分别足(1.4±0.5)±10-16(J=3/2)和(1.1±0.4)×10-16cm2(J=5/2),7D3/2与H2的反应活动性大于7D5/2.

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