EDP Sciences
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Volume 368, Number 2, March III 2001
Page(s) 712 - 715
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20000544

A&A 368, 712-715 (2001)
DOI: 10.1051/0004-6361:20000544

Laboratory and astrophysical detection of the hyperfine structure of the ${\vec J}$ = 1-0 rotational transition of HC17O+

L. Dore1, G. Cazzoli1 and P. Caselli2

1  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

(Received 13 June 2000 / Accepted 7 December 2000)

The three hyperfine components of the $J=1\leftarrow 0$ rotational transition of ${\rm HC^{17}O}^+$ 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. (1982a). The ${\rm HC^{17}O}^+$ (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

Offprint request: L. Dore, dore@ciam.unibo.it

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