Publication

Intramolecular energy transfer in highly vibrationally excited methanol. III. Rotational and torsional analysis

Thomas Rizzo, Oleg Boyarkine
1999
Journal Articles

Abstract

We report here torsional analysis of rotationally resolved spectra of the 3 nu(1), 5 nu(1), and 6 nu(1) (OH stretch) bands of jet-cooled methanol. The upper states are reached by a double resonance excitation scheme involving the selection of single rotational states in the n1 fundamental band. Detection of the overtone transitions (n nu(1)

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https://infoscience.epfl.ch/entities/publication/35b03942-e31c-4071-a4a6-ebde04211ae7

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Thomas Rizzo, Oleg Boyarkine
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/35b03942-e31c-4071-a4a6-ebde04211ae7

About this result

Related concepts (32)

Rotational–vibrational spectroscopy

Rotational–vibrational spectroscopy is a branch of molecular spectroscopy concerned with infrared and Raman spectra of molecules in the gas phase. Transitions involving changes in both vibrational and rotational states can be abbreviated as rovibrational (or ro-vibrational) transitions. When such transitions emit or absorb photons (electromagnetic radiation), the frequency is proportional to the difference in energy levels and can be detected by certain kinds of spectroscopy.

Rotational spectroscopy

Rotational spectroscopy is concerned with the measurement of the energies of transitions between quantized rotational states of molecules in the gas phase. The spectra of polar molecules can be measured in absorption or emission by microwave spectroscopy or by far infrared spectroscopy. The rotational spectra of non-polar molecules cannot be observed by those methods, but can be observed and measured by Raman spectroscopy.

Molecular vibration

A molecular vibration is a periodic motion of the atoms of a molecule relative to each other, such that the center of mass of the molecule remains unchanged. The typical vibrational frequencies range from less than 1013 Hz to approximately 1014 Hz, corresponding to wavenumbers of approximately 300 to 3000 cm−1 and wavelengths of approximately 30 to 3 μm. For a diatomic molecule A−B, the vibrational frequency in s−1 is given by , where k is the force constant in dyne/cm or erg/cm2 and μ is the reduced mass given by .

Related publications (10)

Intramolecular energy transfer in highly vibrationally excited methanol. III. Rotational and torsional analysis

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