Collisional effects on the HFS transitions of antiprotonic heliumстатья
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Дата последнего поиска статьи во внешних источниках: 2 мая 2014 г.
Аннотация:Collisions of metastable antiprotonic helium with ordinary He atoms can
induce transitions between hyperfine structure (HFS) sublevels and thus relaxation
of the populations as well as shift and broadening of M1 microwave spectral
lines. Previously we have considered these effects, using quantum close-coupling
method for the collisions and the model interatomic interaction involving tensor term
(Korenman and Yudin, J Phys B At Mol Opt Phys 39:1473–1484, 2006). In this paper
we extend the consideration in two lines: (i) collisional transition rates, shifts and
broadenings of M1-lines are considered in relation to the strength of the tensor
interaction; (ii) time evolution of the density matrix of HFS states is considered
using the generalized master equation with the calculated elementary characteristics.
A good agreement with the recent experimental data on the time dependence of
optimum signal-to-noise ratio and of linewidth is obtained using the strength of
tensor interactions as a free parameter.