TIME RESOLVED INFRARED DIODE LASER SPECTROSCOPY OF THE $\nu_1$ BAND OF CoNO PRODUCED BY THE ULTRAVIOLET PHOTOLYSIS OF Co(CO)$_3$NO
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Date
2005
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Rovibrational transitions of the $\nu_1$ band (N-O stretch) of CoNO produced by the ultraviolet photolysis of Co(CO)$_3$NO were observed in the 1775-1800 cm$^{-1}$ region by time resolved infrared diode laser spectroscopy. In total, 35 absorption lines were assigned to the $\nu_1$ fundamental band, and their $J$ quantum numbers were determined by a simultaneous analysis with millimeter-wave spectroscopy}. Hotband lines originated from the $\nu_2$ (bending), 2$\nu_2$, and $\nu_3$ (Co-N stretch) vibrationally excited states were also observed. Molecular constants, including the band origin $\nu_0$ 1796.22371(49) cm$^{-1}$, the rotational constant $B_{\rm{0}}$ 4669.7578(29) MHz, and the vibration rotation constant $\alpha_1$ 31.325(28) MHz, were derived from the observed spectrum. The equilibrium rotational constant $B_e$ (4676.949(51) MHz) was determined with the $\alpha_1$ value derived in the present study and the $\alpha_2$ and $\alpha _3$ values reported by the millimeter-wave spectroscopy$^a$. The equilibrium bond-length $r_{\rm{Co-N}}$ was calculated to be 1.583 \AA \ assuming $r_{\rm{NO}}$ = 1.182 \AA \ by $ab \ initio$ calculation}. The absorption lines for the $\nu_1 + \nu_2 \leftarrow \nu_2$ and $\nu_1 + 2\nu_2 \leftarrow 2\nu_2$ bands were split into two components due to the $\Delta l$=2 interaction. The electronic ground state of CoNO was confirmed to be $^1\Sigma ^+$ by this infrared study as reported by our previous millimeter-wave spectroscopy$^a$.
Description
{Tanaka et al, the 59th OSU International Symposium on Molecular Spectroscopy (2004).{M. Zhou and L. Andrews, $J. \ Phys. \ Chem. $ A 104, 3915 (2000).
Author Institution: Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashiku, Fukuoka, 812-8581 JAPAN
Author Institution: Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashiku, Fukuoka, 812-8581 JAPAN