Fourier Transform Emission Spectroscopy of a He/N2 Supersonic Jet in the 2-μm Region: a1Πg → a′1Σ−u and w1Δu → a1Πg Systems of the 14N2 Molecule

✍ Scribed by F. Roux; F. Michaud; M. Vervloet

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 258 KB
• Volume: 164
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1093

✦ Synopsis

The first extensive analysis of the (a^{1} \mathrm{I}{\mathrm{g}} \rightarrow a^{\prime} \mathrm{\Sigma}{u}^{-}-)system of ({ }^{14} \mathrm{~N}{2}) is reported. The spectrum has been recorded by high-resolution Fourier transform spectrometry between 2500 and (7500 \mathrm{~cm}^{-1}) using a supersonic jet and a classical microwave discharge. Accurate molecular parameters of the (a^{\prime 1} \Sigma{u}^{-}, a^{\prime} I_{g}), and (w^{\prime} \Delta_{u}) states are determined by fitting simultaneously the whole set of wavenumbers of the two (a \rightarrow a^{\prime}) and (w \rightarrow a) systems. The RKR potential energy curve of the (a^{\prime \prime} \Sigma_{u}^{-}) state is then derived and Franck-Condon factors for the (a \rightarrow a^{\prime}) system are calculated. Predissociation is observed in the (a^{1} \mathrm{II}_{\mathrm{k}}(\boldsymbol{v}=7)) level. c 1994 Academic Press. Inc.