Torsional, rotational, and torsional-rotational energy levels of arbitrary molecules with a single internal rotation axis

1999 ◽  
Vol 42 (1) ◽  
pp. 82-91
Author(s):  
V. N. Vinogradova ◽  
A. A. Vinogradov ◽  
E. A. Kukhtina
Keyword(s):  
Internal Rotation ◽  
Rotation Axis ◽  
Energy Levels ◽  
Rotational Energy

Internal methyl rotation and molecular structure of trifluorotoluenes: microwave rotational spectra of 2,3,4- and 2,4,5-trifluorotoluene

2020 ◽  
Vol 98 (6) ◽  
pp. 543-550 ◽  
Author(s):  
K.P. Rajappan Nair ◽  
Sven Herbers ◽  
Daniel A. Obenchain ◽  
Jens-Uwe Grabow
Keyword(s):  
Internal Rotation ◽  
Rotation Axis ◽  
Molecular Constants ◽  
Methyl Carbon ◽  
Rotational Spectra ◽  
Pulsed Jet ◽  
Principal Axes ◽  
The Moment ◽  
Centrifugal Distortion Constants ◽  
Methyl Rotation

The microwave rotational spectra of 2,3,4- and 2,4,5-trifluorotoluenes, along with all 13C isotopic species in natural abundance, have been recorded in the frequency range 8–27 GHz employing pulsed-jet Fourier transform microwave spectroscopy. The analysis of the spectra in the lowest torsional state has yielded the rotational constants, centrifugal distortion constants, three-fold barrier to methyl rotation, and the direction of the internal rotation axis in the moment of inertia principal axes systems of these trifluorotoluenes. For both molecules, the molecular constants of their eight isotopologues have been used to obtain the substitution rs structures of the ring and the methyl-carbon. The potential barriers hindering the internal rotation of the methyl top in 2,3,4- and 2,4,5-trifluorotluene are 2.5878(80) and 2.2809(23) kJ/mol, respectively.

Methane as Carrier Gas for Molecular Beam Microwave Spectroscopy to Observe Transitions of Higher Rotational Energy Levels

1996 ◽  
Vol 51 (10-11) ◽  
pp. 1091-1095 ◽  
Author(s):  
F. Lorenzo ◽  
J.-U. Grabow ◽  
H. Dreizler
Keyword(s):  
Molecular Beam ◽  
Energy Levels ◽  
Rotational Energy ◽  
Microwave Spectroscopy ◽  
Rotational Spectroscopy ◽  
Rare Gases ◽  
Carrier Gas

Abstract We report on an observation in molecular beam rotational spectroscopy: using Methane rather than rare gases as carrier extends the range of observable transitions towards levels of higher rotational energy.

Stark Perturbed Rotational Energy Levels of the Rigid Linear Top Rotor

1970 ◽  
Vol 52 (11) ◽  
pp. 5964-5965 ◽  
Author(s):  
P. J. Bertoncini ◽  
R. H. Land ◽  
S. A. Marshall
Keyword(s):  
Energy Levels ◽  
Rotational Energy
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