dc.creator Echebiri, Geraldine O. en_US dc.creator Smarte, Matthew en_US dc.creator Walters, Wendell W. en_US dc.creator Cleveland, Jill M. en_US dc.creator McCarl, Christine en_US dc.creator Kunin, Alice en_US dc.creator Mullin, Amy S. en_US dc.date.accessioned 2013-07-16T21:35:26Z dc.date.available 2013-07-16T21:35:26Z dc.date.issued 2013 en_US dc.identifier 2013-RH-10 en_US dc.identifier.uri http://hdl.handle.net/1811/55241 dc.description Author Institution: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742 en_US dc.description.abstract The dynamics of collisional deactivation of highly energized molecules, pyrazine-h$_{4}$ and pyrazine-d$_{4}$, by HCl molecules at 300 K show evidence of a new mechanism for collisional energy transfer. Highly vibrationally excited (E$_{vib}$ = 37,900 $\wn$) pyrazine-h$_{4}$ and pyrazine-d$_{4}$ molecules are produced in separate experiments by pulsed excitation with the fourth harmonic output of a Nd:YAG laser at $\lambda$ = 266 nm. Collisions between the energized isotopes and HCl molecules are monitored by measuring the nascent transient IR absorption of scattered HCl in individual rotational states. The results indicate that HCl molecules are scattered with a gain in rotational and translational energy, but the largest recoil energies are observed for the lowest rotational energy states of HCl. This behavior is opposite to that seen for other bath molecules including DCl and CO$_{2}$. The results point to differences in intermolecular interactions between the energy donor and acceptor molecules as contributing factors to the observed differences in the mechanism of energy transfer. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title OBSERVATION OF NEW DYNAMICS IN THE STATE-RESOLVED COLLISIONAL RELAXATION OF HIGHLY EXCITED MOLECULES en_US dc.type Article en_US
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