Abstract
The molecular ion D2H+ is an important species in cold interstellar environments and a key benchmark for ab initio calculations. We have measured 37 transitions in the ν1 fundamental band using the sub-Doppler technique Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy. Using an optical frequency comb for accurate frequency calibration, the uncertainties for most transitions were improved by more than an order of magnitude. These new measurements lead to improved predictions of pure rotational transition frequencies which have not been observed by THz observatories or laboratory spectrometers.
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