Observation of low-lying resonance states of He{sup {minus}} at the 2 {sup 1}S and 2 {sup 3}S He thresholds
Observation of low-lying resonance states of He{sup {minus}} at the 2 {sup 1}S and 2 {sup 3}S He thresholds
复制标题
在 2 {sup 1}S 和 2 {sup 3}S He 阈值处观察 He{sup {minus}} 的低位共振态
DOI：
10.1103/physreva.55.r14
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
R. Barrachina
中科院分区：
文献类型：
--
作者：
A. Bader;L. Sarkadi;L. Víkor;M. Kuzel;P. Závodszky;T. Jalowy;K. Groeneveld;P. Macri;R. Barrachina
We measured the cusp electron production associated with target ionization at the impact of a 400-keV pure2{sup 3}S He beam and a mixed beam containing all three long-lived He states, i.e., 1{sup 1}S, 2{sup 1}S, and 2{sup 3}S. Using the results of an earlier experiment [Kuzel {ital et al.}, Phys. Rev. A {bold 48}, R1745 (1993)], we estimated the cross section for both metastable states of He. We found that the cusp for the 2{sup 1}S state is much larger and sharper than for the 2{sup 3}S state. The peaks are manifestations of excitation of low-lying virtual or weakly bound states of the He{sup {minus}} ion at the 2{sup 1}S and 2{sup 3}S thresholds. {copyright} {ital 1997} {ital The American Physical Society}
We measured the cusp electron production associated with target ionization at the impact of a 400-keV pure2{sup 3}S He beam and a mixed beam containing all three long-lived He states, i.e., 1{sup 1}S, 2{sup 1}S, and 2{sup 3}S. Using the results of an earlier experiment [Kuzel {ital et al.}, Phys. Rev. A {bold 48}, R1745 (1993)], we estimated the cross section for both metastable states of He. We found that the cusp for the 2{sup 1}S state is much larger and sharper than for the 2{sup 3}S state. The peaks are manifestations of excitation of low-lying virtual or weakly bound states of the He{sup {minus}} ion at the 2{sup 1}S and 2{sup 3}S thresholds. {copyright} {ital 1997} {ital The American Physical Society}