Infrared cavity ringdown spectroscopy of methanol clusters: Single donor hydrogen bonding
| Autor: | Henry F. Schaefer, R. A. Provencal, J. B. Paul, Gregory S. Tschumper, C. Chapo, K. Roth, R. Casaes, Richard J. Saykally |
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| Rok vydání: | 1999 |
| Předmět: |
Absorption spectroscopy
Chemistry Infrared Dimer Analytical chemistry General Physics and Astronomy Infrared spectroscopy Trimer Rotational–vibrational spectroscopy chemistry.chemical_compound Physics::Atomic and Molecular Clusters Physics::Chemical Physics Physical and Theoretical Chemistry Spectroscopy Absorption (electromagnetic radiation) Astrophysics::Galaxy Astrophysics |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.478309 |
| Popis: | Infrared cavity ringdown laser absorption spectroscopy has been used to study the O–H stretching vibrations of jet-cooled methanol clusters in direct absorption. Rovibrational bands for (CH3OH)2, (CH3OH)3, and (CH3OH)4 have been measured. Both bonded and free O–H stretches were measured for the dimer, indicating that its structure is linear. Five bands were assigned to the methanol trimer, indicating the presence of a second cyclic isomer in the molecular beam. A detailed study of the free O–H stretching region shows that methanol clusters larger than dimer must exist in cyclic ring configurations. In order to facilitate spectral assignment, harmonic frequencies and infrared intensities were calculated for the methanol monomer, dimer, and trimer with second order Mo/ller–Plesset perturbation theory. Using the theoretical infrared intensities and measured vibrational band absorptions, absolute cluster concentrations were calculated. Results agree with previous experimental and theoretical work. |
| Databáze: | OpenAIRE |
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