Abstract
By Stark tuning the ${\mathrm{N}}^{14}$${\mathrm{H}}_{2}$D molecule into optical resonance with a standing-wave laser field, which is intense and monochromatic, it has been possible to obtain a unique vibration-rotation line assignment and its transition matrix element, and to probe ground- and excited-state Stark splittings with precision. Stark splittings as narrow as 1.5 MHz (within a Doppler width of 82 MHz) are observed for the first time in an optically excited state using the Lamb dip.
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