CH3C4D
1,3-Pentadiyne, methyldiacetylene, deuterated at C1
Species tag 065521
Version1*
Date of EntryDec. 2025
ContributorH. S. P. Müller

The experimental transition frequencies are from
(1) G. A. Heath, L. F. Thomas, E. I. Sherrard, and J. Sheridan, 1955, Discuss. Faraday Soc. 19, 38;
and from astronomical observations by
(2) C. Cabezas, R. Fuentetaja, E. Roueff, M. Agúndez, B. Tercero, N. Marcelino, J. R. Pardo, P. de Vicente, and J. Cernicharo, 2022, Astron. Astrophys. 657, L5.
B and DJK were fit, several other spectroscopic parameters were estimated from the main species. Transition frequencies with calculated uncertainties exceeding 0.1 MHz should be viewed with great caution. Transition frequencies above 100 GHz should be viewed with caution.
The dipole moment was assumed to agree with that of the main species, see e064507.cat.

Lines Listed684
Frequency / GHz< 200
Max. J51
log STR0-8.5
log STR1-6.0
Isotope Corr. 
Egy / (cm–1)0.0
 µa / D1.207
 µb / D 
 µc / D 
 A159140.
 B1929.778
 C = B
 Q(300.0)48029.5388
 Q(225.0)31189.5333
 Q(150.0)16974.4307
 Q(75.00)6001.1892
 Q(37.50)2127.2011
 Q(18.75)776.3636
 Q(9.375)301.1362
 Q(5.000)132.4685
 Q(2.725)63.1267
detected in ISM/CSMyes


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