Radiative lifetimes of vibrationally excited ions HCl+ and DCl+(2Π1/2,3/2, ν= 1)

Abstract

The radiative lifetimes of the ν= 1 vibrational level of DCl⁺ and HCl⁺ ions in their ground electronic state have been measured using a pulsed triple-cell ICR spectrometer and a proton-transfer reaction to probe the energy content of the ions. The experimental lifetimes: 3.4 ± 1.2 and 13.2 ± 3 ms, respectively, are somewhat smaller than the calculated values of Rosmus (4.6 and 19.2 ms). The isotopic ratio τ_(DCl⁺)/τ_(HCl⁺) is close to [ν_(DCl⁺)/ν_(HCl⁺)]^–4 indicating that the double-harmonic approximation applies.