A photopredissociation spectrum of theAthinsp;1Pgr;undash;Xthinsp;1Sgr;+g(8,2) transition in N2+2is reported. The spectrum was recorded by detecting the photofragment signal as a function of excitation wavelength in a merged laserhyphen;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 observedvrsquo;=8 levels were measured. The predissociation rates were found to bee/fsymmetry dependent and, in particular, for theflevels, alsoJdependent. Somewhat surprisingly it appears as if tunneling does not contribute to the observed predissociation; rather, thevrsquo;=8 level of theAthinsp;1Pgr;ustate is depleted by coupling to the continua of the1Sgr;minus;u,3Sgr;+u, and3Dgr;ustates.
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