Millimetre- and submillimetre-wave spectroscopy of 13C and 15N isotopomers of cyanoacetylene, HCCCN, in the ground and vibrationally excited states

Abstract

The pure rotational spectra of the astrophysically important monosubstituted HC₃N-isotopomers HCC¹³CN, HC¹³CCN, H¹³CCCN and HCCC¹⁵N in their ground and various vibrationally excited states, which will be denoted (₄, ₅, ₆, ₇) hereafter, have been studied extensively in the 2 mm region. Transitions of the ground vibrational states and vibrational satellites appendant to the two lowest bending fundamentals ₆ and ₇ have been measured up to 625 GHz. The Fermi resonance system (0,1,0,0)/(0,0,0,3) has been analyzed for the HCC¹³CN and H¹³CCCN isotopomers for the first time. Furthermore, pure rotational transitions of the four doubly substituted isotopomers HC¹³C¹³CN, H¹³CC¹³CN, H¹³C¹³CCN and HCC¹³C¹⁵N could be detected for the first time, not only in the ground but also in vibrationally excited states. This work is to provide accurate the astronomical community.