期刊
PHYSICAL REVIEW A
卷 100, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.012711
关键词
-
资金
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, Atomic, Molecular, and Optical Sciences [DE-SC0010545]
Low-energy elastic and inelastic scattering in the Ps(1s)-Ps(2s) channel is treated in a four-body hyperspherical coordinate calculation. Adiabatic potentials are calculated for triplet-triplet, singlet-singlet, and singlet-triplet spin symmetries in the spin representation of coupled electrons and coupled positrons, with total angular momentum L = 0 and parity equal to +1. The s-wave scattering lengths for the asymptotic Ps(1s)-Ps(2s) channel are calculated for each spin configuration. Results obtained for the s-wave scattering lengths are a(TT) = 7.3(2)a(0) - i0.02(1)a(0), a(SS) = 13.2(2)a(0) - i0.9(2)a(0), and a(ST) = 9.7(2)a(0) for each spin configuration. Spin recoupling is implemented to extract the scattering lengths for collisions of Ps in different spin configurations through properly symmetrized unitary transformations. Calculations of experimentally relevant scattering lengths and cross sections are carried out for Ps atoms initially prepared in different uncoupled spin states.
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