Rotational structure in an excited vibronic band of the dipolehyphen;supported state of cyanomethyl anion, CH2CNminus;

摘要

Previous reports of threshold resonances occurring in the photodetachment spectra of molecular anions have provided detailed information about the nature of dipolehyphen;supported states and the dynamics of autodetachment from the vibrationless level. In this paper we report the first observation and analysis of rotational band structure in an excited vibrational level of a dipolehyphen;supported state. The 1 cmminus;1resolution laser photodetachment spectrum of cyanomethyl anion (CH2CNminus;), the conjugate base of acetonitrile, was recorded in the 12thinsp;500ndash;13thinsp;700 cmminus;1region using ion cyclotron resonance spectrometry. Rotational assignment of the resonances occurring in this region provides evidence for vibrationalhyphen;tohyphen;electronic coupling in the autodetachment process.