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No, the usual description is that of an atom moving in an external magnetic field, i.e., a one-particle description. If you assume that there is no gas, then there is no decoherence but unitary time evolution of the single-particle state only. For a complete treatment, see
http://arxiv.org/abs/quant-ph/0409206
http://arxiv.org/abs/quant-ph/0409206