Progress on inner-shell excitations of molecular van der Waals clusters
Autor(en): | Ruhl, E Flesch, R Tappe, W Pavlychev, AA |
Stichwörter: | CARBON; clusters; CO; ENERGIES; FREE ARGON CLUSTERS; Instruments & Instrumentation; molecules; N-2; near-edge spectra; Optics; Physics; Physics, Applied; quasi-atomic approach; SIZE; SPECTROSCOPY; X-RAY-ABSORPTION | Erscheinungsdatum: | 2001 | Herausgeber: | INT UNION CRYSTALLOGRAPHY | Journal: | JOURNAL OF SYNCHROTRON RADIATION | Volumen: | 8 | Ausgabe: | 2 | Startseite: | 154 | Seitenende: | 157 | Zusammenfassung: | Recent progress on core-level excitation of molecular van der Waals clusters is reported. Resonant excitation near element K edges of isolated and clustered molecules gives rise to small spectral shifts that can only be detected with high spectral resolution. This requires the use of state-of-the-art storage-ring facilities along with insertion devices and high-resolution soft X-ray monochromators. Selected experimental results on carbon monoxide clusters are reported. For the vibrationally resolved C 1s --> pi* (nu = 0) band of clustered CO, these indicate characteristic line broadening as well as a small red shift of 2 /- 1 meV compared with the isolated molecule. The results are discussed within the framework of the quasi-atomic approach with respect to intermolecular interactions, freezing of molecular rotations in clusters, and dynamic localization of resonant core-to-valence excitations. |
Beschreibung: | 11th International Conference on X-ray Absorption Fine Structure (XAFS XI), AKO, JAPAN, JUL 26-31, 2000 |
ISSN: | 16005775 | DOI: | 10.1107/S0909049500018525 |
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