{"title":"Specific rate constants k(E,J) for the dissociation of NO2: II. Linewidths of rotationally selected NO2 near to the dissociation threshold.","authors":"B. Abel, N. Lange, J. Troe","doi":"10.1063/1.1398306","DOIUrl":null,"url":null,"abstract":"Optical double-resonance “fluorescence depletion pumping,” has been employed to investigate rovibronic states of jet-cooled NO2 in the region of the dissociation threshold E0. The method allows for the selection of angular momenta of the reacting molecules. In particular, molecules with J=0.5 and 1.5 or with J=2.5 and 3.5 have been selectively investigated. In the first 10 cm−1 above E0, the linewidths for J=0.5 and 1.5 as well as 2.5 and 3.5 have been found to fluctuate around average values which correspond to dissociation rate constants of 2×1010 s−1 and 1.65×1010 s−1, respectively. The experimental results for J=0.5 and 1.5 are in agreement with time-resolved data and quantum mechanical calculations. The difference in average linewidths for the molecules with J=0.5/1.5 and 2.5/3.5 was found to be small. The appearance of the double-resonance spectra does not principally change for higher angular momentum J, i.e., some sharp lines on top of a congested unresolved background are still observed. It is co...","PeriodicalId":58,"journal":{"name":"The Journal of Physical Chemistry ","volume":null,"pages":null},"PeriodicalIF":2.7810,"publicationDate":"2001-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry ","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1063/1.1398306","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 14
Abstract
Optical double-resonance “fluorescence depletion pumping,” has been employed to investigate rovibronic states of jet-cooled NO2 in the region of the dissociation threshold E0. The method allows for the selection of angular momenta of the reacting molecules. In particular, molecules with J=0.5 and 1.5 or with J=2.5 and 3.5 have been selectively investigated. In the first 10 cm−1 above E0, the linewidths for J=0.5 and 1.5 as well as 2.5 and 3.5 have been found to fluctuate around average values which correspond to dissociation rate constants of 2×1010 s−1 and 1.65×1010 s−1, respectively. The experimental results for J=0.5 and 1.5 are in agreement with time-resolved data and quantum mechanical calculations. The difference in average linewidths for the molecules with J=0.5/1.5 and 2.5/3.5 was found to be small. The appearance of the double-resonance spectra does not principally change for higher angular momentum J, i.e., some sharp lines on top of a congested unresolved background are still observed. It is co...