The ν1 fundamental band of D2H+ has been observed in absorption between 2640 and 2990 cm−1 using a tunable difference frequency system in conjunction with a multitraversal cell. The D2H+ was generated in a modulated direct current discharge in a mixture of H2 and D2 cooled to 77 K. Thirty-five b-type transition frequencies were fitted to an effective Hamiltonian to determine the rotational constants and the band origin.
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Lubic et al. (1984) studied this question.