Photofragment spectroscopy of resonances in the A 1Πu state of N22+

This is the authors' abstract. We don't add key points for this paper.

A photopredissociation spectrum of the A 1Πu–X 1Σ+g (8,2) transition in N2+2 is reported. The spectrum was recorded by detecting the photofragment signal as a function of excitation wavelength in a merged laser-ion beam apparatus. Line positions for the (8,2) band were measured and reduced to molecular constants. The natural linewidths, and hence predissociation rates, of all observed v′=8 levels were measured. The predissociation rates were found to be e/f symmetry dependent and, in particular, for the f levels, also J dependent. Somewhat surprisingly it appears as if tunneling does not contribute to the observed predissociation; rather, the v′=8 level of the A 1Πu state is depleted by coupling to the continua of the 1Σ−u, 3Σ+u, and 3Δu states.