Evidence for excited states of CO3-* and NO3-* from collisional dissociation processes

Details Evidence for excited states of CO3-* and NO3-* from collisional dissociation processes Evidence for excited states of CO3-* and NO3-* from collisional dissociation processes

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..735w&link_type=abstract

Planetary and Space Science, Volume 29, Issue 7, p. 735-739.

Physics

6

Scientific paper

Excitation functions for collision-induced dissociation reactions of CO 3- and NO3- to give O- and the corresponding neutral species have been studied using an in-line tandem mass spectrometer. When these ions were prepared from certain gaseous mixtures, larger cross-sections and lower thresholds were observed for the dissociation processes than those found for the same ions in their apparent ground states. These observations suggest the existence of long-lived excited states of CO3-* and NO3-*. The heats of formation of these excited ionic states were determined to be -4.8 +/- 0.1 and -0.3 +/- 0.2 eV for CO3-* and NO3-*, respectively. Possible implications of these findings with respect to the D -region negative ion reaction scheme are discussed.

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