Observation of Excited Quadrupole-Bound States in Cold Anions

被引：41
作者：
Zhu, Guo-Zhu [1 ]
Liu, Yuan [1 ]
Wang, Lai-Sheng [1 ]
机构：
[1] Brown Univ, Dept Chem, Providence, RI 02912 USA
来源：
PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 02期
关键词：
MOLECULAR QUADRUPOLE; POLAR-MOLECULES; NEGATIVE-IONS; GROUND-STATE; DIMER ANION; DIPOLE; ELECTRON; SPECTROSCOPY; BINDING; AUTODETACHMENT;
D O I：
10.1103/PhysRevLett.119.023002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the first observation of an excited quadrupole-bound state (QBS) in an anion. High-resolution photoelectron imaging of cryogenically cooled 4-cyanophenoxide (4CP(-)) anions yields an electron detachment threshold of 24 927 cm(-1). The photodetachment spectrum reveals a resonant transition 20 cm(-1) below the detachment threshold, which is attributed to an excited QBS of 4CP(-) because neutral 4CP has a large quadrupole moment with a negligible dipole moment. The QBS is confirmed by observation of seventeen above-threshold resonances due to autodetachment from vibrational levels of the QBS.
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页数：5
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