Physics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confetg03c&link_type=abstract
"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec
Physics
Electronic
Scientific paper
The origin band of the tilde{A}1B2 - tilde{X}1A1 (π*←π) absorption system in monodeuterated tropolone (TrOD) has been probed with rotational resolution by applying polarization-resolved degenerate four-wave mixing (DFWM) spectroscopy under ambient, bulk-gas conditions. Judicious selection of polarization geometries for incident and detected electromagnetic waves alleviated intrinsic spectral congestion and facilitated dissection of overlapping transitions, thereby enabling refined rotational-tunneling parameters to be extracted for the tilde{A}1B2 (π*π) manifold. A pronounced 2.14(5) wn bifurcation of rovibronic features is measured for the zero-point level of electronically excited TrOD, reflecting the presence of a substantial potential barrier along the O-D\cdotsO longleftrightarrow O\cdotsD-O reaction coordinate and representing nearly a ten-fold decrease in magnitude over the analogous tunneling-induced splitting for the parent (TrOH) isotopolog. The dependence of hydron-migration dynamics on internal degrees of freedom will be discussed in light of donor-acceptor displacements incurred by π*←π electron promotion and structural effects accompanying selective isotopic modification of the tropolone molecular framework.
Estimated to be of 1270.6 wn height at the fully-optimized EOM-CCSD/aug-cc-pVDZ level of theory; L. A. Burns, D. Murdock, and P. H. Vaccaro, J. Chem. Phys. 130, 144304 (2009).
Chew Kathryn
Nemchick Deacon J.
Vaccaro Patrick H.
Wolff John E.
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