Conversion of homonuclear molecules in atomic cryomatrices

A theory of the conversion of homonuclear molecules of the type N2 in inert gases is constructed. Underlying the conversion mechanism is the interaction of the nuclear spins of the rotator molecule with atoms of the crystal environment. Since the energy ε transferred to phonons is small, the characteristic conversion time [which is proportional to (ε/θ)3, where θ is the Debye temperature] is very long. The possibility of conversion being observed experimentally should apparently be associated with the stimulation of the conversion by paramagnetic impurities. According to the the estimates made, the characteristic time of O2-stimulated conversion is no more than 3 · 104 h, which is comparable to the conversion times in solid deuterium. The general aspects of conversion kinetics are considered and so are the most promising ways of detecting conversion in a thermal experiment.

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