Rotational Heat Capacity of Diatomic Molecules in Atomic Cryocrystals
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Date
1992-06
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Addis Ababa University
Abstract
A Comparative analysis has been carried out between the
experimental excess heat capacity of solid solutions of"N2 and
''N2 in Ar and Kr due to rotation of the nitrogen molecules, and
the existing theoretical models in the temperature range 0.5 to
6 Kelvin. It is shown that the well known Devonshire-ManzMirsky
(DMM) model can not explain the observed heat capacity
below 2K neither on the basis of the assumption of frozen hightemperature
nor equlibrium concentration of different spin
nuclear modifications of nitrogen. Splitting of the lowest
rotational energy levels of the impurinty molecules is
proposed, so as to provide an agreement between the
experimental observations and theoretical data. It is also
concluded that experimental observations favour the frozen
high-temperature composition of the different spin species of
nitrogen down to 0.5K in temperature, and the equilibrium'
orientation of the molecules is along the <100> directions of
the crystal
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Keywords
Rotational Heat Capacity