Abstract
We have observed transitions between Rydberg states of He with sub-Doppler resolution, using a novel technique. Ordinary Doppler line shapes, observed at low magnetic fields, are completely altered at high fields by the quadratic Stark effect induced by velocity-dependent electric fields arising from atomic motion transverse to the magnetic field. The high-field line shape has an abrupt cutoff, corresponding to ${v}_{\ensuremath{\perp}}\ensuremath{\simeq}0$ atoms, whose slope is primarily limited by the homogeneous linewidth.
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