Jet-Cooled Cavity Ring-Down Spectroscopy of the ~a ^2E^"-~X ^2A_2^' Vibronic Transition of NO_3

Details Jet-Cooled Cavity Ring-Down Spectroscopy of the ~a ^2E^"-~X ^2A_2^' Vibronic Transition of NO_3 Jet-Cooled Cavity Ring-Down Spectroscopy of the ~a ^2E^"-~X ^2A_2^' Vibronic Transition of NO_3

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confewj04c&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Radicals And Ions

Scientific paper

The three energetically lowest electronic states (~X 2A2^', ~A 2E^", and ~B 2E^') of NO_3 are strongly coupled by vibronic interactions and have been treated in considerable detail theoretically. Corresponding experimental characterization of the interaction is much less detailed. Previous experimental results primarily consist of IR measurements of vibrational transitions in the ground state. In addition, the electronically forbidden ~A-~X transition has been observed in ambient temperature CRDS studies. A slit-jet nozzle with a high voltage pulsed discharge has been applied to produce the NO_3 radical by dissociating the N-O bond of N_2O_5, and the jet-cooled NO_3 CRDS absorption spectrum has been successfully observed with a high-resolution laser source (Δν≈250MHz, intrinsic resolution considering the instrumental linewidth and the residual Doppler broadening in the jet). The 4^1_0 band (parallel band) shows complex rotational structure which is presently being analyzed. The 2^1_0 band has also been measured as an example of a perpendicular band. Besides the ν_2 and ν_4 vibronic bands, the vibronically forbidden origin band (0^0_0 band) has been recorded under the same experimental conditions. The weakly observed ~A-~X origin band is likely either a magnetic dipole or an electric quardrupole transition.
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