Production of N(+)-asterisk from N2 + hnu - Effective EUV emission yields from laboratory and dayglow data

Details Production of N(+)-asterisk from N2 + hnu - Effective EUV emission yields from laboratory and dayglow data Production of N(+)-asterisk from N2 + hnu - Effective EUV emission yields from laboratory and dayglow data

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1197m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, Aug. 1991, p. 1197-1207.

Other

15

Dayglow, Electron States, Emission Spectra, Extreme Ultraviolet Radiation, Photodissociation, Thermosphere, Fluorescence, Nitrogen Ions, Synchrotron Radiation

Scientific paper

Photodissociative ionization of N2 into the unbound N2(+) H 2Sigma-g(+) state is identified as the parentage of a number of N(+) and N-excited states that contribute to the u.v. dayglow. Yields have been obtained for the production of extreme ultraviolet emission lines of N(+) and N from a laboratory experiment using a broadband synchrotron radiation source with fluorescence spectroscopy. The yields are termed 'effective', in that they are constant percentages of the H state cross section. These are compared wih effective yields needed to reproduce N II 1085 and 916 A lines from four dayglow observations using a model of solar energy deposition and photoelectron production and loss in the earth's thermosphere. The 1085 A effective yield measured in the laboratory (18 percent) agrees with that from the dayglow data (average of 17 percent) to well within experimental uncertainties. Thus, it is concluded that photodissociative ionization of N2 is the primary source of the N II 1085 A dayglow. However, there is an order of magnitude discrepancy among the various dayglow observations of the 1085/916 intensity ratio, only one of which is consistent with the laboratory observation of 4.4. Neither contamination by other dayglow features nor atmospheric extinction can account for the disparities. Laboratory measurements of N2 and O2 absorption cross sections at these wavelengths are also reported.

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