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1. A Microwave Study of Hydrogen-Transfer-Triggered Methyl-Group Rotation in 5-Methyltropolone
Published: 11/10/2010
Authors: Vadim V. Ilyushin, Emily A. Cloessner, Yung-Ching Chou, Laura B. Picraux, Jon Torger Hougen, Richard Lavrich
Abstract: We present here the first experimental and theoretical study of the microwave spectrum of 5-methyltropolone, which can be visualized as a 7-membered aromatic carbon ring with a five-membered hydrogen-bonded cyclic structure at the top and a methyl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903562

2. A New Torsion-Rotation Fitting Program for Molecules with a Six-Fold Barrier: Application to the Toluene Microwave Spectrum
Published: 10/29/2009
Authors: Vadim V Ilyushin, Zbigniew Kisiel, Lech Pszczolkowski, Heinrich Maeder, Jon Torger Hougen
Abstract: A new program is described for fitting rotation-torsion energy levels in the molecules like toluene, in which the frame (C6H5) has C2v symmetry and the methyl top has C3v symmetry, i.e., for molecules where the internal rotation barrier is expanded i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903188

3. A fitting program for molecules with two inequivalent methyl tops and a plane of symmetry at equilibrium. Application to new microwave and millimeter-wave measurements in methyl acetate
Published: 7/25/2011
Authors: Marcela Tudorie, Isabelle Kleiner, Jon Torger Hougen, Sonia Melandri, Lilian Sutikdja, Wolfgang Stahl
Abstract: A program for fitting the high-resolution torsion-rotation spectra of molecules having two inequivalent methyl rotors and a plane of symmetry at equilibrium is described and then applied to methyl acetate [CH3-O-C(=O)-CH3]. The G18 permutation-inver ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907503

4. Analysis and Fit of the Fourier Transform Microwave Spectrum of the Two-Top Molecule N-Methylacetamide
Published: 1/1/2004
Authors: N Ohashi, Jon Torger Hougen, R D. Suenram, Francis John Lovas, Y Kawashima, M Fujitake, J Pyka
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104065

5. Analysis and Fit of the Fourier-Transform Microwave Spectrum of the Two-Top Molecule N-methylacetamide
Published: 9/1/2004
Authors: N Ohashi, Jon Torger Hougen, R D. Suenram, Francis John Lovas, Y Kawashima, M Fujitake (Japan), J Pyka
Abstract: The jet-cooled Fourier-transform microwave spectrum of N-methylacetamide (CH3-NH-C(=O)-CH3), a molecule containing two methyl tops with relatively low barriers to internal rotation, has been recorded and fit to nearly experimental measurement uncerta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841790

6. Analysis and Global Fit of Tunneling Splittings in the K=0 A-Type Microwave Spectrum of the Methanol Dimer
Published: 1/1/1995
Authors: N Ohashi, Jon Torger Hougen
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104071

7. 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

8. Anomalous Splittings of Torsional Sublevels Induced by the Aldehyde Inversion Motion in the S^d1^ State of Acetaldehyde
Published: 1/1/2004
Authors: Y Chou, I Chen, Jon Torger Hougen
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103695

9. Anomalous Transitions in Two-Level Systems Driven by the AC Stark Effect
Published: 1/1/2001
Authors: W L Meerts, I Ozier, Jon Torger Hougen
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104027

10. Anomalous Transitions in Two-Level Systems Driven by the AC Stark Effect
Published: 10/1/2001
Authors: W L Meerts, I Ozier, Jon Torger Hougen
Abstract: An unusual type of non-resonant absorption signal produced by the ac Stark effect has been observed in a two-level avoided-crossing system. The theory for these anomalous transitions has been developed. The non-resonant signals have been shown to b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841475