Evidence for excited states of CO3?1 and NO3?1 from collisional dissociation processes |
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| Authors: | Richard LC Wu Thomas O Tiernan |
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| Institution: | The Brehm Laboratory and Department of Chemistry, Wright State University, Dayton, OH 45435, U.S.A. |
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| Abstract: | 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?1 and NO3?1. 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?1 and NO3?1, respectively. Possible implications of these findings with respect to the D -region negative ion reaction scheme are discussed. |
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