dc.creator Cosby, P. C. en_US dc.creator Heidrich, J. L. en_US dc.creator Moseley, J. T. en_US dc.date.accessioned 2006-06-15T13:37:07Z dc.date.available 2006-06-15T13:37:07Z dc.date.issued 1975 en_US dc.identifier 1975-MG-01 en_US dc.identifier.uri http://hdl.handle.net/1811/9278 dc.description Author Institution: Molecular Physics Center Stanford Research Institute en_US dc.description.abstract Photodissociation of thermal $CO^{-}_{3}$ to produce $O^{-} +CO_{2}$ has been observed throughout the wavelength range of 6390 -- 5640 {\AA} using a tunable dye laser with a resolution of 0.5 {\AA} and a drift tube mass spectrometer. The photodissociation cross section has significant structure over this photon energy range. Between 6390 and 6050 A there are six well-defined peaks, plus an additional three peaks which are found by a simple deconvolution. These peaks have a FWHM of about 77 cm$^{-1}$ and a mean separation of about 100 cm$^{-1}$. At least nine other peaks are spaced irregularly between 6050 and 5640 \AA. The photodissociation cross section varies from 0.4 to 3.3 $\times$ 10$^{-18}$ cm$^{2}$ over the wavelength range observed. The absolute magnitude and the wavelength dependence of the cross section are independent of photon intensity and gas pressure, indicating a single photon process which involves no collisional dissociation. We do not yet have a full explanation for the detailed structure of the cross section. However, it is almost certainly related to a bound metastable excited state of $CO_{3}^{-}$ which dissociates rapidly either through a curve crossing to a dissociating state, or by a change in geometry brought about by vibration which leads to an unstable configuration. The envelope centered at 6200 {\AA} is probably related to the $\nu$$_{3} or \nu$$_{4}$ bending modes of the excited $CO_{3}^{-}$. We expect to extend these measurements to longer and shorter wavelengths in the near future, and to investigate other ions. en_US dc.format.extent 166909 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title PHOTODISSOCIATION SPECTRUM OF $CO^{-}_{3}$ en_US dc.type article en_US
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