Details
| Original language | English |
|---|---|
| Pages (from-to) | 5433-5438 |
| Number of pages | 6 |
| Journal | Journal of Chemical Physics |
| Volume | 109 |
| Issue number | 13 |
| Publication status | Published - 1998 |
Abstract
The four carbon chain radicals C10H, C12H, C13H, and C14H have been observed in a pulsed supersonic molecular beam with a Fourier transform microwave spectrometer. The radicals were produced in a discharge through a dilute diacetylene/neon mixture in the throat of a supersonic nozzle. All are linear with 2Π electronic ground states, and all except C14H have resolved lambda-type doubling. For each species at least ten rotational transitions, between 6 and 16 GHz, were measured in the lowest spin component, which is 2Π3/2 for C10H, C12H, and C14H, and 2Π1/2 for C13H. Only three spectroscopic constants in the standard Hamiltonian for a molecule in a 2Π state were required to reproduce the spectra to a few parts in 107: an effective rotational constant, a centrifugal distortion constant, and a lambda-type doubling constant. All of the chains here have abundances in the most intense part of the supersonic molecular beam of ≥5×109 per gas pulse, which suggests that optical transitions of all four may be detectable with present laser techniques. For the carbon chain radicals with an even number of carbon atoms, there is very little change in relative abundance from C6H to C14H.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Chemical Physics, Vol. 109, No. 13, 1998, p. 5433-5438.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rotational spectra of the carbon chain free radicals C10H, C12H, C13H, and C14H
AU - Gottlieb, C. A.
AU - McCarthy, M. C.
AU - Travers, M. J.
AU - Grabow, J. U.
AU - Thaddeus, P.
PY - 1998
Y1 - 1998
N2 - The four carbon chain radicals C10H, C12H, C13H, and C14H have been observed in a pulsed supersonic molecular beam with a Fourier transform microwave spectrometer. The radicals were produced in a discharge through a dilute diacetylene/neon mixture in the throat of a supersonic nozzle. All are linear with 2Π electronic ground states, and all except C14H have resolved lambda-type doubling. For each species at least ten rotational transitions, between 6 and 16 GHz, were measured in the lowest spin component, which is 2Π3/2 for C10H, C12H, and C14H, and 2Π1/2 for C13H. Only three spectroscopic constants in the standard Hamiltonian for a molecule in a 2Π state were required to reproduce the spectra to a few parts in 107: an effective rotational constant, a centrifugal distortion constant, and a lambda-type doubling constant. All of the chains here have abundances in the most intense part of the supersonic molecular beam of ≥5×109 per gas pulse, which suggests that optical transitions of all four may be detectable with present laser techniques. For the carbon chain radicals with an even number of carbon atoms, there is very little change in relative abundance from C6H to C14H.
AB - The four carbon chain radicals C10H, C12H, C13H, and C14H have been observed in a pulsed supersonic molecular beam with a Fourier transform microwave spectrometer. The radicals were produced in a discharge through a dilute diacetylene/neon mixture in the throat of a supersonic nozzle. All are linear with 2Π electronic ground states, and all except C14H have resolved lambda-type doubling. For each species at least ten rotational transitions, between 6 and 16 GHz, were measured in the lowest spin component, which is 2Π3/2 for C10H, C12H, and C14H, and 2Π1/2 for C13H. Only three spectroscopic constants in the standard Hamiltonian for a molecule in a 2Π state were required to reproduce the spectra to a few parts in 107: an effective rotational constant, a centrifugal distortion constant, and a lambda-type doubling constant. All of the chains here have abundances in the most intense part of the supersonic molecular beam of ≥5×109 per gas pulse, which suggests that optical transitions of all four may be detectable with present laser techniques. For the carbon chain radicals with an even number of carbon atoms, there is very little change in relative abundance from C6H to C14H.
UR - http://www.scopus.com/inward/record.url?scp=0001383988&partnerID=8YFLogxK
U2 - 10.1063/1.477161
DO - 10.1063/1.477161
M3 - Article
AN - SCOPUS:0001383988
VL - 109
SP - 5433
EP - 5438
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 13
ER -