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An investigation of the rotational spectrum of the interstellar moleculethioformaldehyde between 110 and 377 GHz through a pyrolysis reaction revealeda multitude of absorption lines assignable to H$_2$CS and H$_2$C$^{34}$S intheir lowest four excited vibrational states besides lines of numerousthioformaldehyde isotopologues in their ground vibrational states reportedearlier as well as lines pertaining to several by-products. Additionaltransitions of H$_2$CS in its lowest four excited vibrational states wererecorded in selected regions between 571 and 1386 GHz. Slight to strongCoriolis interactions occur between all four vibrational states with theexception of the two highest lying states because both are totally symmetricvibrations. We present combined analyses of the ground and the four interactingstates for our rotational data of H$_2$CS and H$_2$C$^{34}$S. The H$_2$CS datawere supplemented with two sets of high-resultion IR data in two separateanalyses. The $v_2 = 1$ state has been included in analyses of Coriolisinteractions of low-lying fundamental states of H$_2$CS for the first time andthis improved the quality of the fits substantially. We extended furthermoreassignments in $J$ of transition frequencies of thioketene in its groundvibrational state.

molecular physics

Rotational spectroscopy of the thioformaldehyde isotopologues H$_2$CS  and H$_2$C$^{34}$S in four interacting excited vibrational states and an  account on the rotational spectrum of thioketene, H$_2$CCS