Positronium formation in a liquid phase: Influence of intratrack reactions and temperatureстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:This work clarifies some discrepancies between conventional
models, used in positron annihilation lifetime
(PAL) spectroscopy, and experimental data. The importance
of taking into account Ps interactions with primary
intratrack radiolytic products is demonstrated, for example,
for PAL data in water. We examine the applicability
of a nonhomogeneous chemical kinetics approach and of
a well-known expression for the reaction rate constants
to describe intratrack processes, and show that the prescribed
diffusion approximation (PDA) is a reasonable
model for this. Moreover, we have derived an analytical
expression for the time-dependent reaction rate coefficient,
which previously entered PDA as an external parameter.
Preliminary fittings of the PAL spectra in H2O
over a wide temperature range indicate that Ps reactions
in intratrack processes are diffusion controlled.