M dependence in the analysis of NH3–He microwave double resonance experiments

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Abstract
New close‐coupled calculations of laboratory‐frame, m‐dependent cross sections for rotational excitation in NH3–He collisions are used to examine the validity of using degeneracy averaged values in the analysis of four‐level double resonance experiments. It is found that the proper use of m‐dependent cross sections and absorption probabilities produces only minor changes in the calculated ΔI/I and does not, therefore, resolve the discrepancies between theoretical and experimental values that were noted in previous studies.