Autodetachment spectroscopy of metastable He2 -
Autodetachment spectroscopy of metastable He2 -
复制标题
亚稳态 He2 的自脱离光谱 -
DOI：
10.1103/physrevlett.56.592
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发表时间：
1986
影响因子：
8.6
通讯作者：
Pegg
中科院分区：
文献类型：
--
作者：
Kvale;Compton;Alton;Thompson;Pegg
在He/sub 2//sup +/（30- 65 keV）锂蒸气中双电荷交换形成的He/sub 2//sup -/电子能谱中观察到两个明显的自脱离通道。单个窄峰具有11.5 ± 2.6 meV的质心能量，并且归因于振动自动分离（例如，He/sub 2/ /sup -/（/sup 4/Pi/sub g/）= 1 ..-->.. He/sub 2/ /sup 0/（a /sup 3/.. sigma../ subu//sup +/）= 0+e）。第二个宽峰具有15.78 ± 0.13 eV的质心能量，并且是由He/sub 2/ /sup -/自动脱离到He/sub 2/（X /sup 1/. sigma../ sub g//sup +/）+e排斥连续体。测定了/sup 4/He/sub 2/（a /sup 3/.）的电子亲和势为0.175 ± 0.032 eV。sigma../通过比较/sup 3/He/sub 2/ /sup -/和/sup 4/He/sub 2/ /sup -/的自脱离谱，确定了/sup 4/He/sub 2/sup +/）态。
Two distinct autodetachment channels are observed in the electron energy spectra of He/sub 2/ /sup -/ formed by double charge exchange of energetic He/sub 2/ /sup +/ (30--65 keV) in lithium vapor. A single narrow peak has a center-of-mass energy of 11.5 +- 2.6 meV, and is attributed to vibrational autodetachment (e.g., He/sub 2/ /sup -/(/sup 4/Pi/sub g/)= 1 ..-->..He/sub 2/ /sup 0/ (a /sup 3/..sigma../sub u//sup +/)= 0+e). A second broad peak has a center-of-mass energy of 15.78 +- 0.13 eV and results from autodetachment of He/sub 2/ /sup -/ into the He/sub 2/(X /sup 1/..sigma../sub g//sup +/)+e repulsive continuum. An electron affinity of 0.175 +- 0.032 eV was determined for the /sup 4/He/sub 2/(a /sup 3/..sigma../sub u//sup +/) state by comparison of the /sup 3/He/sub 2/ /sup -/ and /sup 4/He/sub 2/ /sup -/ autodetachment spectra.