The validity of the “few-level” approximation in gaseous relaxation phenomena |
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Authors: | D.A. Andrews J.G. Baker C. Bottcher C. Feuillade |
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Affiliation: | Department of Physics, Schuster Laboratory, The University, Manchester M13 9PL, UK;Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA |
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Abstract: | The Bloch equations including damping are formulated for a molecular system excited by incident radiation. In contrast with a previous treatment the present formalism gives an intuitively satisfactory form of relaxation terms. A three-level system irradiated by a single oscillating field is specifically considered, and using this manifold as a model for a two-level system immersed in a heat bath, the problem of “embedding” a pair of levels connected by radiation within a multi-level manifold is treated. A brief discussion of transient solutions to the Bloch equations is included. |
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