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APS » Journals » Phys. Rev. A » Volume 77 » Issue 6
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Phys. Rev. A 77, 060702(R) (2008) [4 pages]

Role of combination vibrations in resonant positron annihilation

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J. A. Young1,*, G. F. Gribakin2, C. M. R. Lee2, and C. M. Surko1
1Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319, USA
2Department of Applied Mathematics and Theoretical Physics, Queen’s University, Belfast BT7 INN, Northern Ireland, United Kingdom

Received 15 November 2007; published 27 June 2008

Positrons can attach to molecules via vibrational Feshbach resonances, leading to very large annihilation rates. The predictions of a recent theory for this process are validated for deuterated methyl halides where all modes are dipole coupled to the incident positron. Data and analysis are presented for methanol and ethylene, demonstrating the importance of combination and overtone resonances and the ability of the theory to account for these features. The mechanism for these resonances and criteria for their occurrence as well as outstanding questions are discussed.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.060702
DOI:
10.1103/PhysRevA.77.060702
PACS:
34.80.−i, 34.50.−s, 71.60.+z, 78.70.Bj

*Present address: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.

 
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