dc.creator Reho, J. en_US dc.creator Merker, U. en_US dc.creator Radcliff, Matthew R. en_US dc.creator Lehmann, K. K. en_US dc.creator Scoles, G. en_US dc.date.accessioned 2006-06-15T20:01:02Z dc.date.available 2006-06-15T20:01:02Z dc.date.issued 2000 en_US dc.identifier 2000-TB-05 en_US dc.identifier.uri http://hdl.handle.net/1811/19822 dc.description Author Institution: Dept. of Chemistry, Princeton University en_US dc.description.abstract We have performed the first measurement of the $3 ^{2}D \leftarrow 3 ^{2}P$ transition of A1 atoms in liquid helium, using the helium nanodroplet isolation technique. The LIF excitation spectrum is broadened and blue shifted by amounts comparable to other A1 transitions studied in bulk liquid helium, indicating solvation by the nanodroplet. As in the case of solvated Mg atoms, the A1 transition shows a splitting attributable to quadrupole-like deformations of the cavity formed in the helium droplet. Time-resolved studies of wavelength-selected emission indicate a fast non-radiative quenching from the $3 ^{2}D$ state to the $4 ^{2}S$ state, which involves a transfer of $7000 cm^{-1}$ in less than 50 picoseconds. We have modeled this system using Hartree-Fock Damped Dispersion generated potential energy surfaces and shown that a ring of helium atoms forms around the node of A1 $p_{z}$ orbital. We conclude that as the number of He atoms in the waist of the orbital increases, the mixing of $\Sigma$ character into the A1-He $1 ^{2} \Pi$ state (as predicted by spin-orbit mixing) decreases. The lack of $\Sigma$ character corresponds to less A1 valence electron density in the xy plane, causing an attractive region into which the He atoms can be drawn. This can also be described as a localization of the valence electron in its $p_{z}$ orbital, occurring to a greater extent as the number of helium atoms increases. en_US dc.format.extent 119564 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title SPECTROSCOPY OF A1 ATOMS SOLVATED IN HELIUM NANODROPLETS en_US dc.type article en_US
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