Open AccessVibrational autodetachment from hot copper dimer anions: breakdown of the Born-Oppenheimer approximation
Author(s) -
E. K. Anderson,
Alice F. Schmidt-May,
P. K. Najeeb,
Gustav Eklund,
Stefan Rosén,
Mark H. Stockett,
K. C. Chartkunchand,
Magdalena Kamińska,
Klavs Hansen,
H. Cederquist,
Henning Zettergren,
H. T. Schmidt
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1412/23/232012
Subject(s) - dimer , ion , atomic physics , fragmentation (computing) , copper , excited state , chemistry , quantum tunnelling , storage ring , physics , condensed matter physics , beam (structure) , organic chemistry , computer science , optics , operating system
Synopsis The decay of hot copper dimer anions is studied in a cryogenic storage ring. We detect atomic anion and neutral products and determine the fragmentation and vibrational autodetachment (VAD) rates separately. For short storage times the dimer anions predominantly decay by fragmentation of highly rotationally excited ions by tunneling through the rotational barrier. For storage times exceeding 100 ms, however, VAD is dominating. This process is driven by the very weak direct coupling between nuclear and electronic degrees of freedom.