New Rydberg-Rydberg transitions in N2. Identification of the d3 1Sigmag+ state.
Use of a special Penning-ionization source allowed Fourier-transform recording of two previously nonobserved IR emission bands spectra at 5480 and 7630 cm(-1) arising from neutral N(2). The first of these bands is the c(4) (') (1)Sigma(u) (+)-a(") (1)Sigma(g) (+) (0,0) transition, both states involved being previously known by direct vacuum (UV) absorption spectroscopy. The second band corresponds to a d(3) (1)Sigma(g) (+)-c(4) (') (1)Sigma(u) (+) (0,0) transition, in which the upper level belongs to an up to now unidentified Rydberg state. Both the upper and lower levels are perturbed by neighboring valence state levels.
Laboratoire de Photophysique Moleculaire du CNRS and Institut de Physico-Chimie Moléculaire, Bâtiment 213, Université de Paris-Sud, 91405 Orsay Cedex, France. daniel.cossart@ppm.u-psud.fr
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