TIME-RESOLVED INFRARED DIODE LASER SPECTROSCOPY OF THE $\nu_1$ BAND OF THE FeNO RADICAL PRODUCED BY THE ULTRAVIOLET LASER PHOTOLYSIS OF Fe(CO)$_2$(NO)$_2$
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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 the FeNO radical were observed in the 1750-1780 cm$^{-1}$ region. The FeNO radical was produced by 193 nm excimer laser photolysis of Fe(CO)$_2$(NO)$_2$ and the transient absorption signal was detected by time-resolved infrared diode laser spectroscopy.\\ More than 40 lines were assigned to the $\nu_1$ fundamental band of the $\Omega = 5/2$ spin component, together with ten $Q$-branch lines ($J$ = 2.5 - 11.5) in the 1760 cm$^{-1}$ region, to confirm the electronic ground state to be $X^2\Delta_i$. Effective molecular constants for the $\Omega = 5/2$ spin component, including the band origin $\nu_0$ (1767.26093(38) cm$^{-1}$), the rotational constant $B$ (4610.17754(93) MHz) and the centrifugal distortion constant $D$ (1.17003(47) kHz), were derived from a least squares fitting of the observed transitions. The average bond length $r_{\rm Co-N}$ between Co and N was calculated to be 1.621 \AA from the rotational constant $B_0$ assuming $r_{\rm N-O} = $1.186 \AA as given by $ab initio$ calculation}, 3915 (2000)}. The $\nu_1$ hot band lines originated from the $\nu_2$ (Fe-N-O bending; 308 cm$^{-1} ^a$) vibrationally excited state were also observed. Pure rotational lines of FeNO were also observed by the millimeter wave spectroscopy with the UV photolysis of Fe(CO)$_2$(NO)$_2$}.
Description
{M. Zhou and L. Andrews, $J .Phys. Chem. A$, \textbf{104{Microwave session in this symposium.
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