Photodissociation of Formic Acid Isolated in Solid Parahydrogen

Details Photodissociation of Formic Acid Isolated in Solid Parahydrogen Photodissociation of Formic Acid Isolated in Solid Parahydrogen

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confefe02a&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Physics

Matrix/Condensedphase

Scientific paper

The in situ photochemistry of dopant molecules isolated in solid parahydrogen (pH_2) typically differs from analogous studies in rare gas crystals for two main reasons: (1) solid pH_2 has a negligible cage effect so that photodissociation of a precursor molecule can lead efficiently to well-separated fragments, and (2) radical fragments can potentially react with the pH_2 matrix. Our group is currently studying the 193 nm photochemistry of a number of precursor molecules isolated in solid pH_2 via high-resolution FTIR spectroscopy. In this talk I will present results for the 193 nm photolysis of formic acid (FA) in solid pH_2. In rare gas matrices, the analogous FA photochemistry proceeds via the CO+H_2O and CO_2+H_2 photodissociation channels. In solid pH_2, in addition to these channels we observe the production of HCO and HOCO. Further, after the UV laser is turned off, the HOCO concentration continues to increase with a slow first-order rate constant for a period of 10 hours. At this point, we still do not have a full explanation of the chemical mechanism leading to the post-photolysis increase in the HOCO concentration.
J. Lundell, M. Räsänen, J. Mol. Struct. 436-437, 349 (1997).

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