Submillimeter/THz rotational spectroscopy of SH{sup +} (X{sup 3}Σ{sup −}): The complete N = 1←0 transition
- Department of Chemistry, Department of Astronomy, Arizona Radio Observatory, and Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721 (United States)
The N = 1 ← 0 transition of SH{sup +} (X{sup 3}Σ{sup −}) in its complete fine structure multiplet (J = 0 ← 1, 2 ← 1, and 1 ← 1) has been measured using submillimeter/THz direct absorption spectroscopy in the frequency range near 346–683 GHz. This work is the first direct laboratory measurement of the J = 0 ← 1 and 1 ← 1 spin components. This molecular ion was created in the gas phase from a mixture of H{sub 2}S and argon in an AC discharge. Hyperfine components, arising from the nuclear spin of H (I = 1/2), were resolved in every fine structure multiplet. The data have been analyzed using a Hund’s case b{sub βJ} Hamiltonian, resulting in further improvement in the accuracy of the rotational, spin–rotation, spin–spin, and magnetic hyperfine constants for SH{sup +}. From these new data, frequency predictions have been made for the N = 2 → 1 and 3 → 2 transitions, with an estimated uncertainty of less than 1 MHz. These data also confirm the recent detection of the two hyperfine components of the N = 1 → 0, J = 0 → 1 transition of SH{sup +} in the Orion Bar, as well as the J = 1 → 1 component of this molecular ion near 683 GHz toward Sgr B2.
- OSTI ID:
- 22882386
- Journal Information:
- Astrophysical Journal, Vol. 814, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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