LASER INDUCED FLUORESCENCE SPECTROSCOPY OF THE SiNSi $^2\Delta$ -- $\tilde{X}$ $^2\Pi$ TRANSITION
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Date
2008
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Ohio State University
Abstract
On our SiCN/SiNC experiment}, TC02 (2005).}, we measured laser induced fluorescence excitation spectrum in the range, 27,500 $\sim$ 33,000 cm$^{-1}$, under jet cooled condition. Some of the vibronic bands in the spectrum have been assigned to Si containing species, such as Si$_2$, SiCH$_2$, SiCN, and SiNC, but some remain unassigned. The strongest band among them has a $^2\Pi$ -- $^2\Pi$ type rotational structure. The rotational constants of the ground and excited states are determined to be about 0.11 cm$^{-1}$, and they are about half of those of SiCN and SiNC. The spin-orbit interaction constant is determined to be 141.7 and 2.7 cm$^{-1}$ for the ground and excited states, respectively. Those are comparable with 140.8 and 4.9 cm$^{-1}$ for the $\tilde{X}$ $^2\Pi$ and $\tilde{A}$ $^2\Delta$ states of SiCN (~not SiNC~), respectively. As a result of some discussion, we have finally conclude that the spectrum can be attributed to the $^2\Delta$ -- $\tilde{X}$ $^2\Pi$ transition of Si--N--Si. The $^2\Sigma^+$ -- $\tilde{X}$ $^2\Pi$ transition of Si$_2$N was studied by two groups} \underline{267}, 370 (1997).}}, MG05 (2002).}. The rotational constant of the ground $\tilde{X}$ $^2\Pi$ state agrees with that of the previous work. The vibronic structure of the laser induced fluorescence excitation spectrum is unusual; the $^2\Sigma$ -- $^2\Pi$ type vibronic bands have been only identified.
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M. Fukushima and T. Ishiwata, 60th International Symposium on Molecular SpectroscopyD. J. Brugh and M. D. Morse, Chem. Phys. Lett.Z. J. Jakubek, M. Zachwieja, S. G. Nakhate and B. Simard, 57th International Symposium on Molecular Spectroscopy
Author Institution: Faculty of Information Sciences, Hiroshima City University; Asa-Minami, Hiroshima 731-3194, Japan
Author Institution: Faculty of Information Sciences, Hiroshima City University; Asa-Minami, Hiroshima 731-3194, Japan