Applicability of modified effective-range theory to positron-atom and positron-molecule scattering

被引：34
作者：
Idziaszek, Zbigniew [1 ]
Karwasz, Grzegorz
机构：
[1] CNR, INFM, BEC Ctr, I-38050 Povo, Italy
[2] Polish Acad Sci, Ctr Fiz Teoret, PL-02668 Warsaw, Poland
[3] Nicholas Copernicus Univ, Inst Phys, PL-87100 Torun, Poland
来源：
PHYSICAL REVIEW A | 2006年 / 73卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.73.064701
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We analyze low-energy scattering of positrons on Ar atoms and N-2 molecules using the modified effective-range theory (MERT) developed by O'Malley, [J. Math. Phys. 2, 491 (1961)]. We use the formulation of MERT based on exact solutions of the Schrodinger equation with polarization potential rather than low-energy expansions of phase shifts into momentum series. We show that MERT describes the experimental data well, provided that effective-range expansion is performed both for s- and p-wave scattering, which dominate in the considered regime of positron energies (0.4-2 eV). We estimate the values of the s-wave scattering length and the effective range for e(+)-Ar and e(+)-N-2 collisions.
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页数：4
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