{"92071":{"#nid":"92071","#data":{"type":"event","title":"(09-1102) AACP Seminar Series - Prof. Marsha Lester","body":[{"value":"\u003Cp\u003EAACP Seminar Series - Prof. Marsha Lester, University of Pennsylvania\n\u003C\/p\u003E\n\u003Cp\u003ECollisional Quenching of OH Radicals: Dynamical Outcomes\n\u003C\/p\u003E\n\u003Cp\u003EThe nascent OH X\u003Csup\u003E2\u003C\/sup\u003E\u00ce\u00a0 product state distributions arising from collisional quenching of electronically excited OH A\u003Csup\u003E2\u003C\/sup\u003E\u00ce\u00a3+ by several molecular partners have been determined using a pump-probe technique.  For H\u003Csub\u003E2\u003C\/sub\u003E and N\u003Csub\u003E2\u003C\/sub\u003E collision partners, the majority of OH X\u003Csup\u003E2\u003C\/sup\u003E\u00ce\u00a0 products are observed in their lowest vibrational level, v\u00e2\u0080\u00b3=0, with significantly less population in v\u00e2\u0080\u00b3=1.  The OH (v\u00e2\u0080\u00b3=0) products are generated with a substantial degree of rotational excitation, peaking around N\u00e2\u0080\u00b3=15 with H\u003Csub\u003E2\u003C\/sub\u003E as the collision partner and N\u00e2\u0080\u00b3=18 with N\u003Csub\u003E2\u003C\/sub\u003E.  Complementary measurements of the branching fraction into OH \u003Csup\u003E2\u003C\/sup\u003E\u00ce\u00a0 product states demonstrate that reaction is the dominant decay pathway for quenching of OH A\u003Csup\u003E2\u003C\/sup\u003E\u00ce\u00a3+ by H\u003Csub\u003E2\u003C\/sub\u003E, while nonreactive quenching is the dominant pathway for N\u003Csub\u003E2\u003C\/sub\u003E.  These observations are discussed in the context of theoretical calculations that examine the topography of the conical intersections which couple the electronically excited and ground state potential energy surfaces.  The experimental observables are interpreted as dynamical signatures of nonadiabatic passage through the conical intersection regions responsible for quenching in both systems.\n\u003C\/p\u003E\n\u003Cp\u003EFor more information contact \u003Ca href=\u0022mailto:christine.payne@chemistry.gatech.edu\u0022\u003EProf. Christine Payne\u003C\/a\u003E (404-385-3125).\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"AACP Seminar Series - Prof. Marsha Lester, University of Pennsylvania\n\nCollisional Quenching of OH Radicals: Dynamical Outcomes","format":"limited_html"}],"field_summary_sentence":[{"value":"AACP Seminar Series - Prof. Marsha Lester"}],"uid":"27275","created_gmt":"2009-03-25 00:00:00","changed_gmt":"2016-10-08 01:57:11","author":"Shirley Tomes","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2009-11-02T18:30:00-05:00","event_time_end":"2009-11-02T20:00:00-05:00","event_time_end_last":"2009-11-02T20:00:00-05:00","gmt_time_start":"2009-11-02 23:30:00","gmt_time_end":"2009-11-03 01:00:00","gmt_time_end_last":"2009-11-03 01:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"related_links":[{"url":"http:\/\/www.chem.upenn.edu\/chem\/research\/faculty.php?id=25","title":"Prof. Marsha Lester, University of Pennsylvania"}],"groups":[{"id":"85951","name":"School of Chemistry and Biochemistry"}],"categories":[],"keywords":[{"id":"89","name":"chemistry"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cstrong\u003EShirley Tomes\u003C\/strong\u003E\u003Cbr \/\u003EChemistry \u0026amp; Biochemistry\u003Cbr \/\u003E\u003Ca href=\u0022http:\/\/www.gatech.edu\/contact\/index.html?id=st81\u0022\u003EContact Shirley Tomes\u003C\/a\u003E\u003Cbr \/\u003E\u003Cstrong\u003E404-894-0591\u003C\/strong\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}