Pulsed-jet discharge matrix isolation and computational study of CX 2Br + (X = H, F)

Abstract

Pulsed-jet discharge matrix isolation spectroscopy and computational methods were used to characterize the CX 2Br + (X = H, F) ions. Our experiments combined matrix isolation techniques with a pulsed DC discharge nozzle, where a dilute CX 2Br 2:Ar sample was discharged and the products deposited onto a KBr window held at ∼8 K. This study represents the first spectroscopic observation of CH 2Br +, and the first report of the C–Br stretching frequency of CF 2Br +. Our results suggest that the primary mechanism for ion formation is ionization/fragmentation of the precursor by collision with metastable rare gas (Ar) atoms.