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Phys. Rev. Lett. 94, 153004 (2005) [4 pages]

Isotope Effects in Dipole-Bound Anions of Acetone

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Nathan I. Hammer1,* and Robert N. Compton1,2
1Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, USA
2Department of Physics, The University of Tennessee, Knoxville, Tennessee 37996, USA

Ludwik Adamowicz
Department of Chemistry, University of Arizona, Tuscon, Arizona 85721, USA

Stepan G. Stepanian
Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, Kharkov 310164, Ukraine

Received 1 October 2004; published 22 April 2005

Precision measurements using the Rydberg charge-exchange and electric field-detachment methods find that the dipole-bound electron affinity (EA) of acetone (C3H6O) is 55±10  μeV greater than for deuterated acetone (C3D6O). The result agrees well with a theoretical prediction obtained with high-level electronic-structure and anharmonic vibrational calculations. The dipole moments calculated for the vibrationally averaged structures of C3H6O and C3D6O show that the isotope effect (2% reduction) on the EA of acetone is mainly due to a slight reduction (0.5%) of the average dipole moment upon deuteration.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.153004
DOI:
10.1103/PhysRevLett.94.153004
PACS:
33.15.Ry, 33.60.−q, 34.60.+z

*Present address: Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, CT 06520-8107, USA.

 
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