The B~2\u3a3+u 12X~2\u3a0g system of SiNSi: investigation of rovibronic structure and renner-teller interaction by laser induced fluorescence spectroscopy

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 B 3c\u2082 11+u - X 3c\u2082 0fg 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.Peer reviewed: NoNRC publication: Ye