Details
| Original language | English |
|---|---|
| Pages (from-to) | L201-L204 |
| Journal | Astrophysical Journal |
| Volume | 455 |
| Issue number | 2 |
| Publication status | Published - 20 Dec 1995 |
Abstract
A number of low-J rotational transitions have been measured for two conformations of the simplest amino acid, glycine, providing precise hyperfine transition frequencies and electric dipole moments for radioastronomy searches for glycine in interstellar clouds. Measurements were made between 12 and 25 GHz with a pulsed-nozzle, Fabry-Perot-cavity, Fourier transform microwave spectrometer equipped with either a heated nozzle or laser ablation-nozzle for vaporization of solid phase glycine. Nuclear quadrupole coupling constants were determined for both conformers from measurements of the hyperfine-split rotational transitions. The quadrupole coupling constants for conformer I are eQqaa = -1.208(9) MHz and eQqbb = -0.343(8) MHz and for conformer II are eQqaa = 1.773(2) MHz and eQqbb = -3.194(4) MHz. The dipole moment components of both conformers were determined to higher precision. We obtain µa = 3.039(10) X 10-30 C m [0.911(3)D] and ixb = 2.025(17) X 10-30 C m [0.607(5) D] for conformer I, and /xa = 17.92(11) X 10-30 C m [5.372(34)D] and /xb = 3.10(3) X 10-30 C m [0.93(1)D] for conformer II, where the uncertainties shown are 1 standard deviation.
Keywords
- ISM: molecules, Line: identification, Molecular data
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Astronomy and Astrophysics
- Earth and Planetary Sciences(all)
- Space and Planetary Science
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Astrophysical Journal, Vol. 455, No. 2, 20.12.1995, p. L201-L204.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microwave spectra, hyperfine structure, and electric dipole moments for conformers i and ii of glycine
AU - Lovas, F. J.
AU - Kawashima, Y.
AU - Grabow, J. U.
AU - Suenram, R. D.
AU - Fraser, G. T.
AU - Hirota, E.
N1 - Funding Information: The present study was supported in part by Grant-in-Aid (No. 05044045) from the Japanese Ministry of Education, Science, and Culture International Scientific Research Program and a grant (GR 1344/1) from the Deutsche Forschun-gsyemeinschaft.
PY - 1995/12/20
Y1 - 1995/12/20
N2 - A number of low-J rotational transitions have been measured for two conformations of the simplest amino acid, glycine, providing precise hyperfine transition frequencies and electric dipole moments for radioastronomy searches for glycine in interstellar clouds. Measurements were made between 12 and 25 GHz with a pulsed-nozzle, Fabry-Perot-cavity, Fourier transform microwave spectrometer equipped with either a heated nozzle or laser ablation-nozzle for vaporization of solid phase glycine. Nuclear quadrupole coupling constants were determined for both conformers from measurements of the hyperfine-split rotational transitions. The quadrupole coupling constants for conformer I are eQqaa = -1.208(9) MHz and eQqbb = -0.343(8) MHz and for conformer II are eQqaa = 1.773(2) MHz and eQqbb = -3.194(4) MHz. The dipole moment components of both conformers were determined to higher precision. We obtain µa = 3.039(10) X 10-30 C m [0.911(3)D] and ixb = 2.025(17) X 10-30 C m [0.607(5) D] for conformer I, and /xa = 17.92(11) X 10-30 C m [5.372(34)D] and /xb = 3.10(3) X 10-30 C m [0.93(1)D] for conformer II, where the uncertainties shown are 1 standard deviation.
AB - A number of low-J rotational transitions have been measured for two conformations of the simplest amino acid, glycine, providing precise hyperfine transition frequencies and electric dipole moments for radioastronomy searches for glycine in interstellar clouds. Measurements were made between 12 and 25 GHz with a pulsed-nozzle, Fabry-Perot-cavity, Fourier transform microwave spectrometer equipped with either a heated nozzle or laser ablation-nozzle for vaporization of solid phase glycine. Nuclear quadrupole coupling constants were determined for both conformers from measurements of the hyperfine-split rotational transitions. The quadrupole coupling constants for conformer I are eQqaa = -1.208(9) MHz and eQqbb = -0.343(8) MHz and for conformer II are eQqaa = 1.773(2) MHz and eQqbb = -3.194(4) MHz. The dipole moment components of both conformers were determined to higher precision. We obtain µa = 3.039(10) X 10-30 C m [0.911(3)D] and ixb = 2.025(17) X 10-30 C m [0.607(5) D] for conformer I, and /xa = 17.92(11) X 10-30 C m [5.372(34)D] and /xb = 3.10(3) X 10-30 C m [0.93(1)D] for conformer II, where the uncertainties shown are 1 standard deviation.
KW - ISM: molecules
KW - Line: identification
KW - Molecular data
UR - http://www.scopus.com/inward/record.url?scp=0029471702&partnerID=8YFLogxK
U2 - 10.1086/309844
DO - 10.1086/309844
M3 - Article
AN - SCOPUS:0029471702
VL - 455
SP - L201-L204
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -