Details
| Original language | English |
|---|---|
| Pages (from-to) | 12-16 |
| Number of pages | 5 |
| Journal | Journal of molecular spectroscopy |
| Volume | 192 |
| Issue number | 1 |
| Publication status | Published - Nov 1998 |
| Externally published | Yes |
Abstract
Following the laboratory detection by Fourier transform microwave spectroscopy of the four new methylcyanopolyynes described in the accompanying paper by W. Chen et al. (J. Mol. Spectrosc. 1998), we detected two new methylpolyynes, CH3(C≡C)4H and CH3(C≡C)5H. The strongest lines of both molecules, obtained in a discharge with a dilute mixture of methylacetylene and diacetylene in neon, were quite intense: after 4 min of integration, a signal to noise of about 300 for the strongest lines of CH3(C≡C)4H and 30 for those of CH3(C≡C)5H. Enough rotational transitions from the K = 0 and 1 ladders were detected in either molecule to be confident of the identification and to determine the rotational and leading centrifugal distortion constants to high accuracy. Like other carbon chains, the two here may be important in combustion processes and may be detectable in the interstellar gas, where the two shortest methylpolyynes have already been observed,
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Chemistry(all)
- Spectroscopy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of molecular spectroscopy, Vol. 192, No. 1, 11.1998, p. 12-16.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microwave spectra of the methylpolyynes CH3(C≡C)4H and CH3(C≡C)5H
AU - Travers, M. J.
AU - Chen, W.
AU - Grabow, J. U.
AU - McCarthy, M. C.
AU - Thaddeus, P.
PY - 1998/11
Y1 - 1998/11
N2 - Following the laboratory detection by Fourier transform microwave spectroscopy of the four new methylcyanopolyynes described in the accompanying paper by W. Chen et al. (J. Mol. Spectrosc. 1998), we detected two new methylpolyynes, CH3(C≡C)4H and CH3(C≡C)5H. The strongest lines of both molecules, obtained in a discharge with a dilute mixture of methylacetylene and diacetylene in neon, were quite intense: after 4 min of integration, a signal to noise of about 300 for the strongest lines of CH3(C≡C)4H and 30 for those of CH3(C≡C)5H. Enough rotational transitions from the K = 0 and 1 ladders were detected in either molecule to be confident of the identification and to determine the rotational and leading centrifugal distortion constants to high accuracy. Like other carbon chains, the two here may be important in combustion processes and may be detectable in the interstellar gas, where the two shortest methylpolyynes have already been observed,
AB - Following the laboratory detection by Fourier transform microwave spectroscopy of the four new methylcyanopolyynes described in the accompanying paper by W. Chen et al. (J. Mol. Spectrosc. 1998), we detected two new methylpolyynes, CH3(C≡C)4H and CH3(C≡C)5H. The strongest lines of both molecules, obtained in a discharge with a dilute mixture of methylacetylene and diacetylene in neon, were quite intense: after 4 min of integration, a signal to noise of about 300 for the strongest lines of CH3(C≡C)4H and 30 for those of CH3(C≡C)5H. Enough rotational transitions from the K = 0 and 1 ladders were detected in either molecule to be confident of the identification and to determine the rotational and leading centrifugal distortion constants to high accuracy. Like other carbon chains, the two here may be important in combustion processes and may be detectable in the interstellar gas, where the two shortest methylpolyynes have already been observed,
UR - http://www.scopus.com/inward/record.url?scp=0041072622&partnerID=8YFLogxK
U2 - 10.1006/jmsp.1998.7666
DO - 10.1006/jmsp.1998.7666
M3 - Article
AN - SCOPUS:0041072622
VL - 192
SP - 12
EP - 16
JO - Journal of molecular spectroscopy
JF - Journal of molecular spectroscopy
SN - 0022-2852
IS - 1
ER -