JET-COOLED LASER SPECTROSCOPY OF A JAHN-TELLER AND PSEUDO JAHN-TELLER ACTIVE MOLECULE: THE NITRATE RADICAL
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Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Well-known as an important intermediate in atmospheric chemistry, the nitrate radical (NO$_3$) has been extensively studied both experimentally and theoretically. The three energetically lowest electronic states ($\tilde{X}$ $^{2}A_{2}^{\prime}$, $\tilde{A}$ $^{2}E^{\prime\prime}$, and $\tilde{B}$ $^{2}E^{\prime}$) are strongly coupled by vibronic interactions and hence it is a textbook molecule for understanding the coupling between nearby potential energy surfaces. Such coupling has been treated in considerable detail theoretically., \underline{\textbf{126}}, 134309 (2007)}} However, corresponding experimental characterization of the interaction is much less detailed. The experimental results primarily consist of IR measurements of vibrational transitions in the ground state., \underline{\textbf{93}}, 951 (1990)}}, \underline{\textbf{231}}, 193 (1998)}} In addition, the electronically forbidden $\tilde{A}$-$\tilde{X}$ transition has been observed in ambient temperature CRDS studies., \underline{\textbf{122}}, 224305 (2005)}} To understand both the Jahn-Teller and pseudo Jahn-Teller coupling in the molecule, further measurements are required with different selection rules and/or higher resolution to resolve the rotational structures of different transitions. In our group, a high-resolution (source $\Delta\nu\approx$ 100 MHz in NIR region), jet-cooled CRDS system$, and T. A. Miller, {\textit{Phys. Chem. Chem. Phys.}, \underline{\textbf{8}}, 1682, (2006)}} can be applied to rotationally resolve the electronically forbidden $\tilde{A}$-$\tilde{X}$ transition. Furthermore, our high-resolution LIF/SEP system (source $\Delta\nu\approx$ 100 MHz) can provide the direct, rotationally resolved measurements of the $\tilde{B}$-$\tilde{X}$ and $\tilde{B}$-$\tilde{A}$ transitions by operating in the LIF and SEP modes respectively. Such data can provide unambiguous spectral assignments in the $\tilde{X}$, $\tilde{A}$ and $\tilde{B}$ states.
Description
J. F. Stanton, {\textit{J. Chem. Phys.K. Kawaguchi, E. Hirota, T. Ishiwata, and I. Tanaka, {\textit{J. Chem. Phys.K. Kawaguchi, T. Ishiwata, E. Hirota, and I. Tanaka, {\textit{Chem. Phys.A. Deev, J. Sommar, and M. Okumura, {\textit{J. Chem. Phys.S. Wu, P. Dupr$\acute{e
Author Institution: Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210; Arthor Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125; Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210
Author Institution: Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210; Arthor Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125; Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210