Search

The submillimeter wave spectrum of the astrochemically relevant hydrocarbon molecule vinylacetylene (butenyne) has been investigated in selected frequency regions between 181 and 789 GHz covering the quantum numbers 19≤J≤87 and 0≤Ka≤23. A set of significantly improved spectroscopic parameters has been obtained which compares favourably with the related cyano compound vinyl cyanide for which a new comprehensive set of molecular parameters is also presented.The present investigation will aid radioastronomers in search for vinylacetylene in space. [Copyright &y& Elsevier]

Abstract: We report the unequivocal identification of the r Q 3 branch of perdeutero oxadisulfane, DSOD, which has been produced in a discharge of D2S together with D2O. By employing the Cologne Terahertz Spectrometer, we have located the band center near 653GHz, in very close agreement with earlier results deduced from the r Q 0 and r Q 2 branches. The A 0, B 0, and C 0 rotational constants have been determined by carrying out an asymmetric rotor least squares fit with all presently available data, including new R- and P-branch lines. Both, b- and c-type transitions have been observed and the relative dipole moment μ c/μ b has been determined from relative line strengths. All results agree very well with quantum chemically calculated values. [Copyright &y& Elsevier]