The Primary Photodynamics of Aqueous Nitrate: Formation of Peroxynitrite
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- 作者：Dorte Madsen ; Jane Larsen ; Svend Knak Jensen ; S
//pubs.acs.org/images/gifchars/oslash.gif" border="0">ren R. Keiding ; and Jan Th
- 刊名：Journal of the American Chemical Society
- 出版年：2003
- 出版时间：December 17, 2003
- 年：2003
- 卷：125
- 期：50
- 页码：15571 - 15576
- 全文大小：182K
- 年卷期：v.125,no.50(December 17, 2003)
- ISSN：1520-5126
文摘
We have examined the photochemical reactions occurring after irradiation at 200 nm of theaqueous nitrate ion, NO3-(aq). Using femtosecond transient absorption spectroscopy over the range 194-388 nm, we have characterized the formation and subsequent relaxation of the primary photoproducts ofnitrate photolysis. The dominant photoproduct is the cis-isomer of peroxynitrite, which accounts for 48% ofthe excited state molecules initially produced. A slightly smaller fraction, 44%, of the excited moleculesreturn to the electronic ground state of NO3- and relax to the vibrational ground state in 2 ps. The remaining8% of the molecules initially excited react via the 
NO + O2- or the NO- + O2 dissociation channels.Formation of NO2- and NO2 is not observed, suggesting that the previous observations of these speciesin steady-state photolysis are caused by reactions occurring on a longer time scale.
NO + O2- or the NO- + O2 dissociation channels.Formation of NO2- and NO2 is not observed, suggesting that the previous observations of these speciesin steady-state photolysis are caused by reactions occurring on a longer time scale.