Guelin et al. 1978

Guelin, M., S. Green, and P. Thaddeus, 1978: Detection of the C₄H radical towards IRC+10216. Astrophys. J., 224, L27-L30, doi:10.1086/182751.

Four emission doublets in the millimeter-wave spectrum of IRC+10216 have been identified as the N = 9→8, 10→9, 11→10, and 12→11 rotational transitions of the C₄H radical. The rotation and spin-doubling constants of C₄H derived from the astronomical data are B₀ = 4758.48±0.10 MHz and |γ| = 38.7±1.0 MHz. The lines of C₄H in IRC+10216 are about as strong as those of the similar radical C₃N, but because of its smaller dipole moment, C₄H may be more abundant than C₃N by a factor of 4, with a column density in the range of 4×10¹⁴ to 3×10¹⁵ cm^-2.

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Guelin, M., Green, S., and Thaddeus, P.: Detection of the C₄H radical towards IRC+10216, Astrophys. J., 224, L27-L30, doi:10.1086/182751, 1978.

Guelin, M., S. Green, and P. Thaddeus (1978), Detection of the C₄H radical towards IRC+10216, Astrophys. J., 224, L27-L30, doi:10.1086/182751.

Guelin, M., S. Green, and P. Thaddeus, 1978: Detection of the C₄H radical towards IRC+10216. Astrophys. J., 224, L27-L30, doi:10.1086/182751.

Guelin, M., Green, S., & Thaddeus, P. 1978, Astrophys. J., 224, L27, doi:10.1086/182751.

Guelin M, Green S, Thaddeus P. Detection of the C₄H radical towards IRC+10216, Astrophys J 1978;224:L27-L30. doi:10.1086/182751.

M. Guelin, S. Green, P. Thaddeus, Astrophys. J. 224, L27-L30, doi:10.1086/182751 (1978).