High-resolution Fourier transform spectroscopy of 14N2:: Analysis of the (1-0), (2-1) bands of the B3Πg-W3Δu system

The extension of high-resolution observation of the electronic emission spectrum of N-14(2) toward the infrared domain is presented. To date, rotational analysis of the widely investigated spectrum of the Nz molecule was done in a spectral domain ranging from 2500 cm(-1) to the UV. We have recorded for the first time the infrared part of the N-14(2) spectrum from 1250 to 2250 cm(-1), using the Fourier transform spectrometer of Laboratoire de Photophysique Moleculaire (LPPM) at an unapodized resolution of 0.0043 cm(-1). A complete rotational analysis is performed for the (1 --> 0), (2 --> 1), (0 <-- 1), (1 <-- 2) bands of the B(3)Pi(g)-W(3)Delta(u) system, not included in any previous analysis. Spectroscopic parameters for the v = 0, v = 1, v = 2 levels of the B(3)Pi(g) and the W(3)Delta(u) states, consistent with those previously reported but with improved accuracy, an obtained from the experimental wavenumbers by a nonlinear least-squares procedure. (C) 1999 Academic Press.