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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