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| Dokumentenart: | Artikel | ||||
|---|---|---|---|---|---|
| Titel eines Journals oder einer Zeitschrift: | Physical Chemistry Chemical Physics | ||||
| Band: | 3 | ||||
| Nummer des Zeitschriftenheftes oder des Kapitels: | 24 | ||||
| Seitenbereich: | S. 5373-5382 | ||||
| Datum: | 2001 | ||||
| Zusätzliche Informationen (Öffentlich): | CAN 136:191010 73-5 Optical, Electron, and Mass Spectroscopy and Other Related Properties 2443-46-1 (1,6-Methano[10]annulene) Role: PRP (Properties) (monomer and van der Waals dimer; fluorescence excitation and UV-UV double-resonance spectroscopy of S0 S1(Lb) transition of methano[10]annulene cooled in supersonic jet - dedicated to professor F. Doerr on occasion of his 80th birthday) | ||||
| Institutionen: | Chemie und Pharmazie > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick | ||||
| Identifikationsnummer: |
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| Stichwörter / Keywords: | Fluorescence (IR, fluorescence excitation and UV-UV double-resonance spectroscopy of S0 S1(Lb) transition of methano[10]annulene cooled in supersonic jet - dedicated to professor F. Doerr on occasion of his 80th birthday); Optical double resonance (UV-UV, fluorescence excitation and UV-UV double-resonance spectroscopy of S0 S1(Lb) transition of methano[10]annulene cooled in supersonic jet - dedicated to professor F. Doerr on occasion of his 80th birthday); UV and visible spectra (fluorescence excitation and UV-UV double-resonance spectroscopy of S0 S1(Lb) transition of methano[10]annulene cooled in supersonic jet - dedicated to professor F. Doerr on occasion of his 80th birthday); Van der Waals complexes, Role: PRP (Properties) (fluorescence excitation and UV-UV double-resonance spectroscopy of S0 S1(Lb) transition of methano[10]annulene cooled in supersonic jet - dedicated to professor F. Doerr on occasion of his 80th birthday); annulene methano UV ODR fluorescence van der Waals dimer | ||||
| Dewey-Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik > 540 Chemie | ||||
| Status: | Veröffentlicht | ||||
| Begutachtet: | Ja, diese Version wurde begutachtet | ||||
| An der Universität Regensburg entstanden: | Ja | ||||
| Dokumenten-ID: | 5577 |
Zusammenfassung
The 1st electronic singlet transition S0 -> S1 of the 10p-arom. compd. 1,6-methano[10]annulene (MA) cooled in a supersonic jet was studied up to an excess energy of 4000 cm-1. The strongest line at 25,154 cm-1 is assigned as the electronic origin. Anal. of the rotational envelope of this line proved that the transition dipole is parallel to the long axis of the mol. Optical-optical double ...
Zusammenfassung
The 1st electronic singlet transition S0 -> S1 of the 10p-arom. compd. 1,6-methano[10]annulene (MA) cooled in a supersonic jet was studied up to an excess energy of 4000 cm-1. The strongest line at 25,154 cm-1 is assigned as the electronic origin. Anal. of the rotational envelope of this line proved that the transition dipole is parallel to the long axis of the mol. Optical-optical double resonance was used to identify the lines which share the same ground state with the origin transition. These lines occur all at higher energies. A few weaker lines which are always present but do not lead to double resonances are tentatively attributed to a van-der-Waals dimer of MA. The rich vibrational structure is interpreted in terms of 13 fundamental vibrations of a1 symmetry and 11 of a2 symmetry, based on the anal. of the rotational contours. The fundamental vibrational frequencies of the excited state are in very good agreement with ab initio calcns. Based on these calcns. 8 further lines which are not combination bands are tentatively assigned to double quantum transitions in b1 and b2 modes. These results strongly support the assignment of a delocalized structure without bond length alternation to the electronic ground state as well as to the 1st electronically excited singlet state.
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