Detection of the quadrupole hyperfine structure in HCNH(+)

Details Detection of the quadrupole hyperfine structure in HCNH(+) Detection of the quadrupole hyperfine structure in HCNH(+)

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l.123z&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 2, p. L123-L126.

Astronomy and Astrophysics

Astrophysics

10

Abundance, Hyperfine Structure, Interstellar Matter, Molecular Ions, Nitrogen Compounds, Quadrupoles, Interstellar Chemistry, Ion Recombination

Scientific paper

We report the first measurement of the electric quadrupole hyperfine structure of HCNH(+). The J = 1-0 transition of this interstellar molecular ion was observed toward the cold, dark cloud TMC-1, using the NRAO 12 m telescope at 74 GHz. The three hyperfine components of this transition were clearly detected and resolved, enabling the first experimental determination of the quadrupole coupling constant eqQ of HCNH(+). The value of this constant is calculated to be eqQ = -0.49 +/- 0.07 MHz. The column density of HCNH(+) toward TMC-1 was found to be N(tot) about 2.8 x 10 exp 13/sq cm, corresponding to a fractional abundance relative to H2 of f about 3 x 10 exp -9. This abundance is at least one order of magnitude higher than the predictions of ion-molecule chemistry. Detection of the hyperfine structure clearly establishes the presence of HCNH(+) in interstellar space.

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