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  • Title: Observation of Excited Quadrupole-Bound States in Cold Anions.
    Author: Zhu GZ, Liu Y, Wang LS.
    Journal: Phys Rev Lett; 2017 Jul 14; 119(2):023002. PubMed ID: 28753341.
    Abstract:
    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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