Laboratory and astrophysical detection of the hyperfine structure of the = 1-0 rotational transition of HCO+
Dipartimento di Chimica "G. Ciamician", Università di Bologna, via Selmi 2, 40126 Bologna, Italy
2 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
Corresponding author: L. Dore, firstname.lastname@example.org
Accepted: 7 December 2000
The three hyperfine components of the rotational transition of have been resolved in laboratory leading to a value of the quadrupole coupling constant eQq of 4.595 MHz, which is far below the previous estimate of an upper limit of 12 MHz by Guélin et al. [CITE]. The (1-0) spectrum has been observed toward the "molecular peak"of L1544 and analyzed on the basis of the laboratory hyperfine frequencies.
Key words: molecular data / methods: laboratory / ISM: individual(L1544), molecules / radio lines: ISM
© ESO, 2001