Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | L231-L234 |
| Fachzeitschrift | Astrophysical Journal |
| Jahrgang | 494 |
| Ausgabenummer | 2 PART II |
| Publikationsstatus | Veröffentlicht - 29 Jan. 1998 |
| Extern publiziert | Ja |
Abstract
The linear cyanopolyynes HC15N and HC17N were detected in the laboratory by Fourier transform microwave spectroscopy. Enough rotational lines of each species were measured in the 5-11 GHz frequency range so that precise values for the rotational and centrifugal distortion constants can be determined and the entire rotational spectra of both molecules predicted to better than 1 km s-1 in equivalent radial velocity over the range of interest to radio astronomy. Although there is a nearly constant decrement in line intensity from HC3N to HC9N of about seven, the decrement decreases by at least a factor of 2 on reaching HC17N, and as a result the lines of HC17N are nearly an order of magnitude stronger than predicted by extrapolation from the shorter cyanopolyynes. With a molecular weight of 219 amu and a rotational constant of slightly more than 50 MHz, HC17N is the longest carbon chain identified to date by high-resolution spectroscopy.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Astronomie und Astrophysik
- Erdkunde und Planetologie (insg.)
- Astronomie und Planetologie
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in: Astrophysical Journal, Jahrgang 494, Nr. 2 PART II, 29.01.1998, S. L231-L234.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Laboratory detection of the carbon chains HC15N and HC17N
AU - Mccarthy, M. C.
AU - Grabow, J. U.
AU - Travers, M. J.
AU - Chen, W.
AU - Gottlieb, C. A.
AU - Thaddeus, P.
PY - 1998/1/29
Y1 - 1998/1/29
N2 - The linear cyanopolyynes HC15N and HC17N were detected in the laboratory by Fourier transform microwave spectroscopy. Enough rotational lines of each species were measured in the 5-11 GHz frequency range so that precise values for the rotational and centrifugal distortion constants can be determined and the entire rotational spectra of both molecules predicted to better than 1 km s-1 in equivalent radial velocity over the range of interest to radio astronomy. Although there is a nearly constant decrement in line intensity from HC3N to HC9N of about seven, the decrement decreases by at least a factor of 2 on reaching HC17N, and as a result the lines of HC17N are nearly an order of magnitude stronger than predicted by extrapolation from the shorter cyanopolyynes. With a molecular weight of 219 amu and a rotational constant of slightly more than 50 MHz, HC17N is the longest carbon chain identified to date by high-resolution spectroscopy.
AB - The linear cyanopolyynes HC15N and HC17N were detected in the laboratory by Fourier transform microwave spectroscopy. Enough rotational lines of each species were measured in the 5-11 GHz frequency range so that precise values for the rotational and centrifugal distortion constants can be determined and the entire rotational spectra of both molecules predicted to better than 1 km s-1 in equivalent radial velocity over the range of interest to radio astronomy. Although there is a nearly constant decrement in line intensity from HC3N to HC9N of about seven, the decrement decreases by at least a factor of 2 on reaching HC17N, and as a result the lines of HC17N are nearly an order of magnitude stronger than predicted by extrapolation from the shorter cyanopolyynes. With a molecular weight of 219 amu and a rotational constant of slightly more than 50 MHz, HC17N is the longest carbon chain identified to date by high-resolution spectroscopy.
KW - ISM: molecules
KW - Line: identification
KW - Molecular data
KW - Molecular processes
KW - Radio lines: ISM
UR - http://www.scopus.com/inward/record.url?scp=0347273694&partnerID=8YFLogxK
U2 - 10.1086/311188
DO - 10.1086/311188
M3 - Article
AN - SCOPUS:0347273694
VL - 494
SP - L231-L234
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 PART II
ER -