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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