LASER SPECTROSCOPIC STUDIES OF STATE-DEPENDENT COLLISIONAL QUENCHING OF THE LIFETIMES OF METASTABLE ANTIPROTONIC HELIUM ATOMS
LASER SPECTROSCOPIC STUDIES OF STATE-DEPENDENT COLLISIONAL QUENCHING OF THE LIFETIMES OF METASTABLE ANTIPROTONIC HELIUM ATOMS
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亚稳态反质子氦原子寿命的状态相关碰撞淬灭的激光光谱研究
DOI：
10.1103/physreva.57.1698
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发表时间：
1998
影响因子：
2.9
通讯作者：
T. Yamazaki
中科院分区：
文献类型：
--
作者：
M. Hori;H. Torii;R. Hayano;T. Ishikawa;F. Maas;H. Tamura;B. Ketzer;F. Hartmann;R. Pohl;C. Maierl;M. Hasinoff;T. Egidy;M. Kumakura;N. Morita;I. Sugai;D. Horvath;E. Widmann;J. Eades;T. Yamazaki
发展了一种直接观测亚稳反质子氦原子（p <$He）单态寿命的激光光谱方法。在压力为0.1 ~ 9.0bar、温度为5.5 ~ 7.0K的低温气体靶中研究了氦原子与周围氦原子的碰撞效应。亚稳态（n，l）5（39，35）的寿命为1.5 ms，与密度无关，而能量较低的态（37，34）的寿命随着密度的增加从1.3 ms缩短到0.1 ms。态（38，34）和态（36，33）的寿命分别为10 ns和5 ns，表明内部俄歇过程的影响。当外推到零密度时，测量的寿命与辐射和俄歇宽度的计算结果一致。利用（37，34）态在高密度下寿命变短的事实，在529.62 nm处检测到（38，35）→（37，34）共振。@S1050-2947~98！01203-7#
A laser spectroscopic method was developed to directly observe the lifetimes of individual states in metastable antiprotonic helium atoms ( p̄ He). Collisional effects with surrounding helium atoms were studied in cryogenic gas targets at pressures between 0.1 and 9.0 bars and at temperatures between 5.5 and 7.0 K. The metastable state (n ,l )5(39,35) showed a lifetime of 1.5 ms, regardless of density, whereas the lifetime of the energetically lower-lying state (37,34) was found to shorten from 1.3 to 0.1 ms with increasing density. The lifetimes of the states (38,34) and (36,33) were determined to be 10 ns and 5 ns, respectively, showing the effects of the internal Auger process. When extrapolated to zero density, the measured lifetimes agreed with the results of calculations for the radiative and Auger widths. Using the fact that the state (37,34) becomes short lived at high density, the resonance (38,35)→(37,34) at 529.62 nm was detected. @S1050-2947~98!01203-7#