Application of the zero-range potential model to positron annihilation on molecules

Details Application of the zero-range potential model to positron annihilation on molecules Application of the zero-range potential model to positron annihilation on molecules

2005-12-19

arxiv.org/abs/physics/0512162v1

Nucl. Instrum. and Methods B 247, 31 (2006)

Physics

Atomic Physics

14 pages, 6 figures, to be published in Nuclear Instruments and Methods B

Scientific paper

10.1016/j.nimb.2006.01.035

In this paper we use a zero-range potential (ZRP) method to model positron interaction with molecules. This allows us to investigate the effect of molecular vibrations on positron-molecule annihilation using the van der Waals dimer Kr2 as an example. We also use the ZRP to explore positron binding to polyatomics and examine the dependence of the binding energy on the size of the molecule for alkanes. We find that a second bound state appears for a molecule with ten carbons, similar to recent experimental evidence for such a state emerging in alkanes with twelve carbons.

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