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Author: jon hougen

Displaying records 11 to 20 of 85 records.
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11. Analysis and fit of the high-resolution spectrum of the A 1A u X 1A g LIF spectrum of the two-equivalent-top molecule biacetyl
Published: 4/23/2009
Author: Jon Torger Hougen
Abstract: Abstract The laser-induced visible fluorescence excitation spectrum of the à 1Au (S1) - X̃ 1Ag (S0) transition in biacetyl (CH3-C(=O)-C(=O)-CH3) exhibits a long progression in the torsional vibrations of the two equivalent methyl tops in this ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901390

12. Assignment, Fit, and Theoretical Discussion of the nu-10 Band of Acetaldehyde Near 509 cm^u-1^
Published: 9/4/2008
Authors: I Kleiner, N Moazzen-Ahmadi, A RW McKellar, Thomas A Blake, G Moruzzi, Jon Torger Hougen
Abstract: The lowest small-amplitude vibration in acetaldehyde (CH3CHO) is the in-plane aldehyde scissors mode ?10 at 509 cm?1. This mode lies about 100 cm?1 above the top of the barrier to internal rotation of the methyl group and is relatively well separate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841027

13. Torsion rotation global analysis of the first three torsional states (mt = 0, 1, 2) and terahertz database for methanol
Published: 3/30/2008
Authors: Jon Torger Hougen, Li-Hong Xu, Jonathan M. Fisher, H. Y. Shi, J C Pearson, B J Drouin, G A Blake, R. Braakman
Abstract: Stimulated by recent THz measurements of the methanol spectrum in one of our laboratories, undertaken in support of NASA programs related to the Herschel Space Observatory (HSO) and the Atacama Large Millimeter Array (ALMA), we have carried out a g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904934

14. Reinvestigation of the Microwave Spectrum of 2-Methylmalonaldehyde
Published: 1/11/2008
Authors: Vadim V Ilyushin, E A Alekseev, Y C Chou, Y-C Hsu, Jon Torger Hougen, Francis John Lovas, L B Picaux
Abstract: 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 in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841130

15. Towards the Complete Analysis of the Rotational Spectrum of (CH^d3^)^d3^SnCl
Published: 1/7/2008
Authors: Melanie Schnell, Jon Torger Hougen, J U Grabow
Abstract: The rotational spectrum of the symmetric top trimethyl tin chloride (CH3)3SnCl has been studied using a pulsed molecular beam Fourier transform microwave spectrometer in the frequency range from 3 to 24 GHz. The spectrum is exceedingly complicated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841131

16. Reanalysis of the Microwave Absorption Spectrum of Dimethyl Methylphosphonate and Its Internal Rotation Problem
Published: 1/10/2007
Authors: Nobukimi Ohashia, Jon Torger Hougen
Abstract: The Fourier transform microwave spectrum of dimethyl methylphosphonate studied by us previously is reanalyzed here to obtain more physically reasonable parameters describing the various Coriolis-like couplings between overall rotation and internal ro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841062

17. Two-Dimensional Tunneling Hamiltonian Treatment of the Microwave Spectrum of 2-Methylmalonaldehyde
Published: 10/26/2006
Authors: Yung-Ching Chou, Jon Torger Hougen
Abstract: 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 in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840973

18. Internal Rotation and Spin Conversion of CH^d3^OH in Solid Para-Hydrogen
Published: 1/20/2006
Authors: Y J Wu, R M Lees, L H Xu, Jon Torger Hougen, Yuan-Pern Lee
Abstract: The quantum solid para-hydrogen (p-H2) has recently emerged as a novel host for matrix-isolation spectroscopy; species isolated in p-H2 exhibit spectral lines with widths much smaller than for samples in other inert-gas matrices, and several species ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840991

19. Electronic Spectra of Molecules with Two C^d3v^ Internal Rotors: Torsional Analysis of the A^u1^A^du-^X^u1^A^dg^ Spectrum of Biacetyl
Published: 9/1/2005
Authors: Cheng-Liang Huang, Chen-Lin Liu, Chi-Kung Ni, Jon Torger Hougen
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841858

20. The Rotational Spectrum of the Ground State of Methylamine
Published: 2/1/2005
Authors: Vadim V Ilyushin, E A Alekseev, S F Dyubkoa, R A Motiyenkoa, Jon Torger Hougen
Abstract: Recent progress is reported in measuring, assigning and fitting the rotational spectrum of the ground vibrational state of methylamine, CH3NH2, a spectrum complicated both by internal rotation of the methyl top and by inversion of the amino group. N ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841817