30 research outputs found
A simple approach to the correlation of rotovibrational states in four-atomic molecules
Full text linkThe problem of correlation between quantum states of four-atomic molecules in
different geometrical configurations is reviewed in detail. A general, still
simple rule is obtained which allows one to correlate states of a linear
four-atomic molecule with those of any kind of non-linear four-atomic molecule.Comment: 16 pages (+8 figures), Postscript (ready to print!
Torsion–rotation global analysis of the first three torsional states (νt=0, 1, 2) and terahertz database for methanol
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Vibration-Rotation Spectroscopy of the Hydrated Hydronium Ions H{sub 5}O{sub 2}{sup +} and H{sub 9}O{sub 4}{sup +}
No full textInternal Rotation and Intensity Calculation in Acetaldehyde
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Selection rules and intensity calculations for a Cs asymmetric to molecule containing a methyl group internal rotor
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Energy levels of Acetaldehyde above the barrier top: Infrared and microwave spectra
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Recommended conventions for defining transition moments and intensity factors in diatomic molecular spectra
No full textTwo recommendations are made that can eliminate persistent confusion in the study of diatomic spectroscopy by providing uniform and consistent definitions of the electronic transition moments and the rotational line intensity factors. First, it is recommended that the equation for the line strength of a single rotational line be adopted to specify the relationship between the electronic transition moment and the rotational line intensity factor. Second, it is recommended that the electronic transition moment operator for perpendicular transitions be defined by (1/21/2)(μx ± iμy). The adoption of these conventions results in a value of (2S + 1)(2J + 1) for the sum rule of the rotational line intensity factor for Σ± ↔ Σ± transitions and a value of 2(2S + 1)(2J + 1) for the sum rule for all other spin-allowed transitions
