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Soft and hard x-ray Raman scattering by oriented symmetrical molecules: Selection rules, interference, and dephasing mechanisms
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-1763-9383
1998 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 109, no 12, 5060-5069 p.Article in journal (Refereed) Published
Abstract [en]

Resonant x-ray Raman scattering in chaotical, partial, and fixed oriented symmetric molecules is analyzed for x-ray photon excitation frequencies in both the soft and the hard x-ray regions. Different dephasing mechanisms and their connection with channel interference and the observation of selection rules are investigated. It is predicted that for harder x-ray energies the scattering cross sections become strongly anisotropic and oscillatory due to channel interference. The orientational dephasing is predicted to be an important coherence-blocking mechanism and can be introduced even by zero-point vibrational or librational motions. The connections between selection rules, symmetry and phase factors of the photon wave function, Bragg conditions and the channel interference show that the selection rules may operate for oriented, surface adsorbed, molecules even in the hard x-ray region. The possibility of using the interference effect for structure determination of adsorbates is discussed.

Place, publisher, year, edition, pages
1998. Vol. 109, no 12, 5060-5069 p.
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-13637ISI: 000076054500041OAI: oai:DiVA.org:kth-13637DiVA: diva2:326270
Note
QC 20100622Available from: 2010-06-22 Created: 2010-06-22 Last updated: 2010-06-29Bibliographically approved
In thesis
1. X-ray scattering by molecules, surface-adsorbates and solids with a coupling to the nuclear motion
Open this publication in new window or tab >>X-ray scattering by molecules, surface-adsorbates and solids with a coupling to the nuclear motion
2000 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2000. vi, 36 p.
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-1120 (URN)91-7170-556-2 (ISBN)
Note
QC 20100622Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-06-22Bibliographically approved
2. Electronic and nuclear dynamics of X-ray processes
Open this publication in new window or tab >>Electronic and nuclear dynamics of X-ray processes
2001 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2001. viii, 68 p.
Keyword
resonant X-ray Raman scattering, nuclear dynamics, relaxation
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:kth:diva-3189 (URN)91-7283-095-6 (ISBN)
Public defence
2001-06-12, 00:00
Note
QC 20100628Available from: 2001-06-08 Created: 2001-06-08 Last updated: 2010-06-29Bibliographically approved

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