%0 Journal Article %1 Crowley:1997p3850 %A Crowley, JN %A Carl, SA %D 1997 %J Journal of Physical Chemistry A %K Acid Chambers, Excitation, Nitrogen-Dioxide, Nm, Photodissociation, Photolysis, %N 23 %P 4178--4184 %T OH formation in the photoexcitation of NO2 beyond the dissociation threshold in the presence of water vapor %U http://www.google.com/search?client=safari&rls=en-us&q=OH+formation+in+the+photoexcitation+of+NO2+beyond+the+dissociation+threshold+in+the+presence+of+water+vapor&ie=UTF-8&oe=UTF-8 %V 101 %X The pulsed-laser-excitation/resonance fluorescence technique was used to assess the efficiency of OH formation following photoexcitation of NO2 at discrete wavelengths beyond the photodissociation threshold in the presence of water vapor: NO2* + H2O --> HONO + OH. Excitation at wavelengths between 432 and 449 nm was found to lead to OH production via a facile sequential two-photon absorption by NO2, leading to O(D-1) and thus to OH in the presence of H2O, i.e., NO2 + hv --> NO2*, NO2* + hv --> NO2**, NO2** --> NO + O(D-1), O(D-1) + H2O --> 2OH. The cross section for the transition NO2** <-- NO2* was found to be similar to that for the NO2* <-- NO2 transition at 435 nm. Al 532 nm, the two-photon process is trot sufficiently energetic to form O('D), and OH is not observed. An upper limit of approximately 10(-5) is found for the reactive quenching of NO2* by water vapor relative to collisional quenching. The atmospheric relevance of OH formation via NO2 excitation is discussed.

@article{Crowley:1997p3850, abstract = {The pulsed-laser-excitation/resonance fluorescence technique was used to assess the efficiency of OH formation following photoexcitation of NO2 at discrete wavelengths beyond the photodissociation threshold in the presence of water vapor: NO2* + H2O --> HONO + OH. Excitation at wavelengths between 432 and 449 nm was found to lead to OH production via a facile sequential two-photon absorption by NO2, leading to O(D-1) and thus to OH in the presence of H2O, i.e., NO2 + hv --> NO2*, NO2* + hv --> NO2**, NO2** --> NO + O(D-1), O(D-1) + H2O --> 2OH. The cross section for the transition NO2** <-- NO2* was found to be similar to that for the NO2* <-- NO2 transition at 435 nm. Al 532 nm, the two-photon process is trot sufficiently energetic to form O('D), and OH is not observed. An upper limit of approximately 10(-5) is found for the reactive quenching of NO2* by water vapor relative to collisional quenching. The atmospheric relevance of OH formation via NO2 excitation is discussed.}, added-at = {2010-06-22T19:38:37.000+0200}, author = {Crowley, JN and Carl, SA}, biburl = {https://www.bibsonomy.org/bibtex/269502522511a7e54ce1876a774990b9c/gsmith}, date-added = {2010-05-14 14:00:33 -0400}, date-modified = {2010-05-14 14:00:48 -0400}, interhash = {7a57b5026ab8f1eb48f4a68504bb94e7}, intrahash = {69502522511a7e54ce1876a774990b9c}, journal = {Journal of Physical Chemistry A}, keywords = {Acid Chambers, Excitation, Nitrogen-Dioxide, Nm, Photodissociation, Photolysis,}, language = {English}, local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Journal%20of%20Physical%20Chemistry%20A/1997/Journal%20of%20Physical%20Chemistry%20A,%20101,%204178-4184%201997.pdf}, month = Jan, number = 23, pages = {4178--4184}, pmid = {A1997XD26300006}, rating = {0}, read = {Yes}, timestamp = {2010-06-22T19:39:22.000+0200}, title = {OH formation in the photoexcitation of NO2 beyond the dissociation threshold in the presence of water vapor}, uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p3850}, url = {http://www.google.com/search?client=safari&rls=en-us&q=OH+formation+in+the+photoexcitation+of+NO2+beyond+the+dissociation+threshold+in+the+presence+of+water+vapor&ie=UTF-8&oe=UTF-8}, volume = 101, year = 1997 }