Dynamics of dissociative recombination versus electron ejection in single rovibronic resonances of BH

摘要

Optical-optical-optical triple resonance spectroscopy isolates transitions to vibrationless Rydberg states of BH with principal quantum numbers from n-7 to 50.Corresponding resonances appear in the excitation spectrum of excited boron atoms produced by the dissociative relaxation of these states.The decay to neutral products occurs on a nanosecond time scale.Yet,corresponding resonances show Fano coupling widths that approach 1 cm-1.Above threshold,spontaneous ionization dominates,but line shapes match for resonances with the same electron orbital quantum numbers built on v+=0 and v+=l cores.This striking feature-for-feature similarity in predissociation and autbionization line shapes affirms that inelastic electron-cation scattering pathways leading to electron ejection and dissociative recombination proceed through a common continuum.