VIBRONIC STRUCTURS OF THE $MgNC \tilde{A}{^{2}}\Pi$ AND $\tilde{X}^{2}\Sigma^{+}$ STATES
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Date
2003
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Ohio State University
Abstract
We have generated MgNC in supersonic free jet expansions, and measured the laser induced fluorescence excitation spectra of the vibronic bands of the $\tilde{A} {^{2}}\Pi - \tilde{X}{^{2}}\Sigma^{+}$ transition. We have found some new features in the spectra, though part of the spectra were already reported by Wright and $Miller^{a}$. The new features are consisting of the $\nu_{2}$ bending vibronic bands. From the rotational analyses of some of the vibronic bands, we have obtained information on the vibronic structure of the $\tilde{A}{^{2}}\Pi$ state of MgNC. The assignments of the $\nu_{2}$ vibronic bands were carried out utilizing the vibrational analyses of the dispersed fluorescence spectra obtained by the excitation of the $\nu_{2}$ vibronic bands. On the basis of the vibrational structures of the dispersed fluorescence spectra which are not only those of the $\nu_{2}$ vibronic bands but also the spectra obtained by the excitation of the other vibronic bands reported by $us^{b}$, the vibronic structure of the $\tilde{X}{^{2}}\Sigma^{+}$ state of MgNC has been analysed. The vibronic structures of the $\tilde{A}^{2}\Pi$ and $\tilde{X}{^{2}}\Sigma^{+}$ states of MgNC will be discussed comparing with the computational results by Hirano $group^{c}$.
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$^{a}$ R. R. Wright and T. A. Miller, J. Mol. Spectrosc. 194, 219 (1999). $^{b}$ M. Fukushima and T. Ishiwata, J. Mol. Spectrosc. 216, 159 (2002). $^{c}$ T. E. Odaka, T. Taketsugu, T. Hirano and U. Nagashima, J. Chem. Phys. 115, 1349 (2001); T. E. Odaka, T. Hirano and P. Jansen, J. Mol. Spectrosc. 211, 147 (2002); T. Hirano, K. Ishii T. E. Odaka and P. Jansen, J. Mol. Spectrosc. 215, 42 (2002); T. E. Odaka, T. Hirano and P. Jansen, J. Mol. Spectrosc. 216, 379 (2002).
Author Institution: Faculty of Information Sciences, Hiroshima City University
Author Institution: Faculty of Information Sciences, Hiroshima City University