# ROTATIONALLY COLD EMISSION IN THE $A^{2}\Pi_{1}-X^{2}\Pi_{r}$ SYSTEM OF $SO^{+}$

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 Title: ROTATIONALLY COLD EMISSION IN THE $A^{2}\Pi_{1}-X^{2}\Pi_{r}$ SYSTEM OF $SO^{+}$ Creators: Milkman, I. W.; Choi, J. C.; Hardwick, J. L.; Moseley, J. T. Issue Date: 1987 Publisher: Ohio State University Abstract: The $A^{2}\Pi_{1}-X^{2}\Pi_{r}$ band system of $so^{+}$ has been observed in emission in a corona-excited supersonic expansion of helium and sulfur dioxide. Survey spectra have been recorded at moderate resolution and rotationally analyzed, and selected bands have been recorded and analyzed at high resolution using a 7m focal length grating spectrograph. The analyses provide rotational, vibrational, and spin-orbit constants for several new levels of both electronic states, including bands which involve lower-lying levels of the ground electronic state than had previously been analyzed. In addition, recording spectra as a function of distance from the nozzle allows us to observe the cooling of the rotational structure as the expansion occurs; at about 20 nozzle diameters downstream, the expansion has reached an effective rotational temperature of 20K or less. Description: Author Institution: Chemical Physics Institute, University of Oregon URI: http://hdl.handle.net/1811/17406 Other Identifiers: 1987-WF-4