In a measurement of emission of Balmer-α flux from atomic hydrogen or deuterium excited by electron impact in a crossed-beam experiment, a longitudinal electric field which enhances the Balmer-α flux by Stark-mixing components of like MJ within the $n=3$ shell, does so asymmetrically depending on whether the field is applied parallel or antiparallel to the electron beam. The effect is attributed to coherent excitation of states of opposite parity.
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Mahan et al. (1977) studied this question.
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