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Title: An observational investigation of the identity of B11244 (l-C{sub 3}H{sup +}/C{sub 3}H{sup -})

Pety et al. have reported the detection of eight transitions of a closed-shell, linear molecule (B11244) in observations toward the Horsehead photodissociation region (PDR), which they attribute to the l-C{sub 3}H{sup +} cation. Recent high-level ab initio calculations have called this assignment into question; the anionic C{sub 3}H{sup –} molecule has been suggested as a more likely candidate. Here, we examine observations of the Horsehead PDR, Sgr B2(N), TMC-1, and IRC+10216 in the context of both l-C{sub 3}H{sup +} and C{sub 3}H{sup –}. We find no observational evidence of K{sub a} = 1 lines, which should be present were the carrier indeed C{sub 3}H{sup –}. Additionally, we find a strong anticorrelation between the presence of known molecular anions and B11244 in these regions. Finally, we discuss the formation and destruction chemistry of C{sub 3}H{sup –} in the context of the physical conditions in the regions. Based on these results, we conclude there is little evidence to support the claim that the carrier is C{sub 3}H{sup –}.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. IRAM, 300 rue de la Piscine, F-38406 Saint Martin d'Hères (France)
  3. LUTH, UMR 8102, CNRS and Observatoire de Paris, Place J. Janssen, F-92195 Meudon Cedex (France)
  4. LERMA, UMR 8112, CNRS and Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris (France)
  5. Division of Chemistry and Chemical Engineering and Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
  6. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
Publication Date:
OSTI Identifier:
22351358
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ALLOCATIONS; CARRIERS; CHEMISTRY; DETECTION; DISSOCIATION; MOLECULES; PHOTOLYSIS