Quenching of metastable states of antiprotonic helium atoms by collisions with H2 molecules
Quenching of metastable states of antiprotonic helium atoms by collisions with H2 molecules
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通过与 H2 分子碰撞来淬灭反质子氦原子的亚稳态
DOI：
10.1063/1.476579
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发表时间：
1998
影响因子：
4.4
通讯作者：
D. Horvath
中科院分区：
文献类型：
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作者：
B. Ketzer;F. Hartmann;T. Egidy;C. Maierl;R. Pohl;J. Eades;E. Widmann;T. Yamazaki;M. Kumakura;N. Morita;R. Hayano;M. Hori;T. Ishikawa;H. Torii;I. Sugai;D. Horvath
利用H2与目标氦气的微量混合物所引起的依赖于状态的猝灭效应，诱导了反质子氦原子在正常亚稳态之间的激光共振跃迁。用这种“H_2辅助反共振”方法测定了pHe ~+的（n，l）=（39，l），l= 36，37，38和（38，l），l= 35，36，37态的衰变率随H_2混合物的变化。由此推导出的n=39的态在30 K时的猝灭截面与pHe+-H2碰撞的几何截面（2 × 10 - 15 cm 2）相当，随l的增加而适度减小。在一个常数为v=n−l−1的级联中，n=38态的猝灭截面比n=39态的猝灭截面小4-6倍。
Laser resonance transitions between normally metastable states of antiprotonic helium atoms were induced making use of state dependent quenching effects caused by trace admixtures of H2 to the target helium gas. With this method of “H2-assisted inverse resonances” the decay rates of the states (n,l)=(39,l),l=36,37,38, and (38,l),l=35,36,37 of pHe+ were determined as a function of the H2 admixture. The quenching cross sections at 30 K deduced therefrom for the states with n=39 were found to be of the order of the geometrical cross section for pHe+–H2 collisons (2⋅10−15 cm2), with a moderate decrease with increasing l. Within a given cascade with constant v=n−l−1, the quenching cross sections for states with n=38 are smaller by a factor of 4–6 than those for states with n=39.
R.S.Hayano.et al.：物理评论快报。
DOI：
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发表时间：
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期刊：
影响因子：
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作者：
通讯作者：
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DOI：
10.1103/physreva.45.7782
发表时间：
1992-06
期刊：
Physical review. A, Atomic, molecular, and optical physics
影响因子：
--
作者：
Yamazaki;Ohtsuki
通讯作者：
Yamazaki;Ohtsuki