Precise THz Measurements of HCO+, N2H+ and CF+ for Astrophysical Observations

Year: 2012

Authors: Cazzoli G., Cludi L., Buffa G., Puzzarini C.

Autors Affiliation: Dipartimento di Chimica \”G. Ciamician,\” Università di Bologna, Via Selmi 2, I-40126 Bologna, Italy; Dipartimento di Fisica \”E. Fermi\” and INO-CNR, Università di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy

Abstract: Ground-state rotational spectra of HCO+, N2H+, and CF+ (both C-12- and C-13- containing isotopologues) have been recorded in the 1.0-1.6 THz frequency range. Present measurements allowed us to improve the spectroscopic parameters, which in turn enabled the prediction of rotational transitions up to 2.0-2.5 THz with good accuracy. We therefore consider the present results to be of great value in view of the extended spectral coverage made available by the Herschel Space Observatory, Stratospheric Observatory for Infrared Astronomy, and the Atacama Large Millimeter Array. Furthermore, we re- investigated the ground-state rotational spectrum of N2H+ in the 93-750 GHz frequency range, thus addressing the open issue of the frequency of the J = 1 <- 0 transition as well as resolving the hyperfine structure of the J = 1 <- J transitions with J = 1, 2, and 3 for the first time. Journal/Review: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

Volume: 203 (1)      Pages from: 11  to: 11

More Information: This work has been supported in Bologna by \”PRIN 2009\” funds and by the University of Bologna (RFO funds).
KeyWords: ISM: molecules; line: identification; methods: data analysis; methods: laboratory; molecular data
DOI: 10.1088/0067-0049/203/1/11

Citations: 36
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