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Displaying 26 - 50 of 320

Microwave Spectrum of 1,2-Propanediol

September 1, 2009
Author(s)
Francis J. Lovas, David F. Plusquellic, Brooks Pate, Justin L. Neill, Matt T. Muckle, Anthony J. Remijan
The microwave spectrum of the sugar alcohol 1,2-propanediol (CH3CHOHCH2OH) has been measured over the frequency range 6.5 GHz to 25.0 GHz with several pulsed-beam Fourier-transform microwave spectrometers. Seven conformers of 1,2-propanediol have been

Reinvestigation of the Microwave Spectrum of 2-Methylmalonaldehyde

January 11, 2008
Author(s)
Vadim V. Ilyushin, E A. Alekseev, Y C. Chou, Y-C Hsu, Jon T. Hougen, Francis J. Lovas, L B. Picaux
The molecule 2-methylmalonaldehyde (2-MMA) exists in the gas phase as a six-membered hydrogen-bonded ring [HO-CH=C(CH3)-CH=O] and exhibits two large-amplitude motions, an intramolecular hydrogen transfer and a methyl torsion. The former motion is

Detection of Interstellar Cyanoformaldehyde (CNCHO)

December 31, 2007
Author(s)
Francis J. Lovas, Anthony J. Remijan, Jan M. Hollis, Wilmer D. Stork, Phil R. Jewell, D Meier
Cyanoformaldehyde (CNCHO) has been detected toward the star-forming region Sagittarius B2(N) with the 100 m Green Bank Telescope (GBT) by means of four P-branch rotational transitions in emission, the 7(0, 7) 6(1, 6) at 8.6GHz, the 8(0, 8) 7(1, 7) at 19.4

Microwave Spectra of Molecules of Astrophysical Interest: XXV. Methylamine

September 5, 2007
Author(s)
Vadim V. Ilyushin, Francis J. Lovas
The microwave spectrum of methylamine in its ground vibrational state is critically reviewed and supplemented with spectral frequency calculations derived from rotation-internal rotation-inversion analysis. The review covers frequency range from 1 GHz to

Detection of C 8 H - and Comparison With C 8 H Toward IRC+10216 With the Green Bank Telescope

June 27, 2007
Author(s)
A Remijan, J M. Hollis, Francis J. Lovas, M A. Cordiner, J Millar, A J. Markwick-Kemper, P R. Jewell
We report the detection of new transitions of octatetraynyl(C8H) toward the circumstellar envelopeIRC+10216 using data taken with the RobertC.Byrd 100m Green Bank Telescope(GBT). In addition, we report 5 transitions from Ku-, K- and Q-band that have been

Nonthermal continuum toward Sagittarius B2(N-LMH)

April 11, 2007
Author(s)
J M. Hollis, P R. Jewell, A Remijan, Francis J. Lovas
An analysis of continuum antenna temperatures observed in theGBTspectrometer bandpasses is presented for observations toward Sgr B2(N-LMH). Since 2004, we have identified four new prebiotic molecules toward this source by means of rotational transitions

The Microwave Spectrum of a Two-Top Peptide Mimetic: The N-Acetyl Alanine Methyl Ester Molecule

September 14, 2006
Author(s)
I Kleiner, J Demaison, David F. Plusquellic, R D. Suenram, R J. Lavrich, Francis J. Lovas, Gerald T. Fraser, Vadim V. Ilyushin
Rotational spectra of the ground torsional state of the N-acetyl alanine methyl ester molecule, a derivative of the alanine dipeptide biomimetic molecule, have been measured using a mini Fourier transform spectrometer between 10 and 20 GHz as part of a

Microwave Spectrum and Structure of Furfural

September 8, 2006
Author(s)
R A. Motiyenkoa, E A. Alekseev, S F. Dyubkoa, Francis J. Lovas
The microwave spectrum of furfural was investigated in the frequency range 7 GHz to 21 GHz and 49 GHz to 330 GHz. The ground and first torsional state of trans-furfural and ground state of cis-furfural were assigned and analyzed. A total of 1720 rotational

Microwave Spectrum of the Heterodimers: CH 3 OH-CO 2 and CH 3 OH-H 2 CO

September 1, 2006
Author(s)
Vadim V. Ilyushin, Francis J. Lovas, David F. Plusquellic
Molecular complexes, dimers and heterodimers, often show interesting structures, large amplitude internal motions and orientations for reaction coordinates. These properties were the motivations for the current study of the rotational spectra of the

Detection Of Ketenimine (CH 2 CNH) in SGRB2(N) Hot Cores

June 28, 2006
Author(s)
Francis J. Lovas, J M. Hollis, A Remijan, P R. Jewell
Ketenimine (CH2CNH) has been detected in absorption toward the star-forming region Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT) by means of three rotational transitions: 716-808 at 41.5 GHz, 819-909, at 23.2 GHz, and 918-100,10 at 4.9 GHz