Propyne, methylacetylene; isotopomer with D on C3
Species tag 041502
Date of EntryApr. 2002
ContributorH. S. P. Müller

The observed lines are from
(1) L. F. Thomas, E. I. Sherrard, and J. Sheridan, 1955, Trans.Faraday Soc. 51, 619;
(2) V. Meyer, Diploma Thesis, Kiel, 1990, kindly provided by H. Mäder
; and from
(3) M. Le Guennec, J. Demaison, G. Wlodarczak, and C. J. Marsden, 1993, J. Mol. Spectrosc. 160, 471. The DK value has been estimated in (3). The dipole moment was taken from the main isotopomer, see The rotation of the inertial axis system with respect to that of the main isotopomer causes a negligible reduction of the a component and a b component of probably less than 0.05 D. Since no b type transitions have been observed, the respective transitions have been omitted from the predictions because of the large uncertainties of their positions.
Note: Non-trivial spin-statistics do not matter for this low symmetry (CS) isotopolog.
The dipole moment was assumed to be the same as for the main isotopomer, see

Lines Listed1892
Frequency / GHz< 1000
Max. J62
log STR0-7.0
log STR1-7.0
Isotope Corr.-3.4766
Egy / (cm-1)0.0
 µa / D0.784
 µb / D 
 µc / D 
detected in ISM/CSMyes

Database maintained by Holger S. P. Müller and Sven Thorwirth, programming by D. Roth and F. Schloeder