15min:
THE B2 Sigma +u - X2 Pig SYSTEM OF SiNSi: INVESTIGATION OF ROVIBRONIC STRUCTURE AND RENNER-TELLER INTERACTION BY LASER INDUCED FLUORESCENCE SPECTROSCOPY..

Z. J. JAKUBEK, M. ZACHWIEJA, S. G. NAKHATE AND B. SIMARD, Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada.

The free SiNSi radical has been investigated in a molecular free jet by laser induced fluorescence excitation and dispersed fluorescence spectroscopy. The radicals have been generated by laser ablation of Si in the presence of NH3 diluted (5%) in He. Excitation spectra of the B2 Sigma +u - X2 Pig system have been recorded in the 32600 - 36400 cm-1 range. For most of the excitation bands, dispersed fluorescence spectra have been obtained. Very large Renner-Teller interaction has been observed in both electronic states. The excitation and dispersed fluorescence spectra have been vibrationally and rotationally analyzed. Rotational, vibrational, and Renner-Teller parameters will be presented.