Study of the electronic ground state of NH 2 by laser excited fluorescence Fourier transform spectroscopy

ISSN： 1362-3028

Source： Molecular Physics, Vol.63, Iss.3, 1988-02, pp. : 433-449

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Abstract

A large number of spin-rovibronic levels of the upper electronic state of NH 2 have been excited with a single mode rhodamine 6G dye laser. Fluorescence spectra were obtained over a wide spectral range (12 000-3700 cm -1 ) using a Fourier transform spectrometer. Levels of the bending vibration were observed from &ngr;″ 2 = 4 up to 10, showing the reordering of the K -structure at the barrier to linearity; their observed energies are in good agreement with the predictions of Jungen, Hallin and Merer [16, 17], Duxbury and Dixon [19] and Perić, Peyerimhoff and Buenker [20]. Numerous vibrational levels involving nv 1 and 2 v 3 were also detected and approximate anharmonic parameters have been deduced. Local perturbations are observed and discussed; the interpretations proposed by Jungen et al. [18] for some of these in the Ã 2 A 1 state are experimentally confirmed.