On the formation of anions: frequency-, angle-, and time-resolved photoelectron imaging of the menadione radical anion.

ABSTRACT: Frequency-, angle-, and time-resolved photoelectron imaging of gas-phase menadione (vitamin K3) radical anions was used to show that quasi-bound resonances of the anion can act as efficient doorway states to produce metastable ground electronic state anions on a sub-picosecond timescale. Several anion resonances have been experimentally observed and identified with the assistance of ab initio calculations, and ground state anion recovery was observed across the first 3 eV above threshold. Time-resolved measurements revealed the mechanism of electronic ground state anion formation, which first involves a cascade of very fast internal conversion processes to a bound electronic state that, in turn, decays by slower internal conversion to the ground state. Autodetachment processes from populat

SUBMITTER: Bull JN 

PROVIDER: S-EPMC5811081 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature