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Data are presented which show that it is possible to observe transitions for which =0, m₉=2 or 3 in a molecule characterized by a total angular J. It is also possible to observe transitions for which =0, m₅=2 or 3 in an atom characterized by a total angular momentum F. In each case the process occurs by the absorption or stimulated emission of two or three equienergetic quanta.
P. Kusch (Mon,) studied this question.