The submillimeter spectrum of CrH and CrD (X6Σ +)

D. T. Halfen, Lucy M Ziurys

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The N = 0 → 1 rotational transition of CrH and the N = 1 → 2 transition of CrD have been recorded in their X6L+ ground electronic states using submillimeter direct absorption spectroscopy. Both species were created in a DC discharge by the reaction of chromium metal, vaporized in a Broida-type oven, with H2 or D2. Because of the presence of five unpaired electrons, as well as the proton or deuterium nuclear spin, these transitions exhibit complicated fine structure and hyperfine splittings. The five strongest hyperfine transitions were measured for CrH and are split over a 60 GHz region because of spin-spin and spin-rotation interactions. Seven lines have also been recorded for CrD arising from four spin components. The data have been analyzed with a Hund's case b Hamiltonian, resulting in improved constants for both species. These data are crucial for submillimeter searches for CrH toward interstellar and circumstellar gas. Electronic transitions of CrH have been routinely observed in L dwarf and brown dwarf atmospheres, suggesting its presence in other astronomical regions.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume611
Issue number1 II
DOIs
StatePublished - Aug 10 2004

Fingerprint

deuterium
atomic absorption spectroscopy
chromium
electron
atmosphere
metal
interstellar gas
gas
ovens
electronics
nuclear spin
absorption spectroscopy
direct current
fine structure
atmospheres
protons
gases
metals
electrons
oven

Keywords

  • Astrochemistry
  • ISM: molecules
  • Line: identification
  • Methods: laboratory
  • Molecular data
  • Stars: AGB and post-AGB

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The submillimeter spectrum of CrH and CrD (X6Σ +). / Halfen, D. T.; Ziurys, Lucy M.

In: Astrophysical Journal, Vol. 611, No. 1 II, 10.08.2004.

Research output: Contribution to journalArticle

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abstract = "The N = 0 → 1 rotational transition of CrH and the N = 1 → 2 transition of CrD have been recorded in their X6L+ ground electronic states using submillimeter direct absorption spectroscopy. Both species were created in a DC discharge by the reaction of chromium metal, vaporized in a Broida-type oven, with H2 or D2. Because of the presence of five unpaired electrons, as well as the proton or deuterium nuclear spin, these transitions exhibit complicated fine structure and hyperfine splittings. The five strongest hyperfine transitions were measured for CrH and are split over a 60 GHz region because of spin-spin and spin-rotation interactions. Seven lines have also been recorded for CrD arising from four spin components. The data have been analyzed with a Hund's case b Hamiltonian, resulting in improved constants for both species. These data are crucial for submillimeter searches for CrH toward interstellar and circumstellar gas. Electronic transitions of CrH have been routinely observed in L dwarf and brown dwarf atmospheres, suggesting its presence in other astronomical regions.",
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N2 - The N = 0 → 1 rotational transition of CrH and the N = 1 → 2 transition of CrD have been recorded in their X6L+ ground electronic states using submillimeter direct absorption spectroscopy. Both species were created in a DC discharge by the reaction of chromium metal, vaporized in a Broida-type oven, with H2 or D2. Because of the presence of five unpaired electrons, as well as the proton or deuterium nuclear spin, these transitions exhibit complicated fine structure and hyperfine splittings. The five strongest hyperfine transitions were measured for CrH and are split over a 60 GHz region because of spin-spin and spin-rotation interactions. Seven lines have also been recorded for CrD arising from four spin components. The data have been analyzed with a Hund's case b Hamiltonian, resulting in improved constants for both species. These data are crucial for submillimeter searches for CrH toward interstellar and circumstellar gas. Electronic transitions of CrH have been routinely observed in L dwarf and brown dwarf atmospheres, suggesting its presence in other astronomical regions.

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