Experimental and theoretical studies of the radiative properties of the N2+2 D 1Σ+u state

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Abstract
The fluorescence lifetime of the v’=0 level of the N2+2 D 1 ∑+u electronic state has been measured, with the high frequency deflection technique, for the first time. The result, τ=6.0±0.5 ns, is in good agreement with a recent photoion–photon of fluorescence coincidence measurement which yields a lifetime, averaged over an unspecified number of vibrational levels, of 8±3 ns. The electronic transition moment function for the N2+2 D 1 ∑+u–X 1 ∑+g transition was calculated with nonorthogonal complete active space SCF wave functions. Potential energy curves for the X 1 ∑+g and D 1 ∑+u states were calculated with a multireference contracted CI treatment and these potential curves were used, together with the electronic transition moment function, to obtain vibrationally averaged transition moments and hence a theoretical radiative lifetime. The calculated lifetime, 8.0 ns, is in good agreement with the experimentally determined value indicating that the decay of D 1 ∑+u, v’=0 occurs primarily via fluorescence to the X 1 ∑+g state.