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Collapse of vibrational structure in spectra of resonant x-ray Raman scattering
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-1763-9383
1997 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 56, no 1, 256-264 p.Article in journal (Refereed) Published
Abstract [en]

Extreme narrowing, or collapse, of electron-vibrational bands is predicted as a new phenomenon in resonant radiative and nonradiative x-ray scattering (RXS) spectra. It is shown that in the inelastic scattering case, that is, when the potential surfaces of ground and final slates are different, a considerable narrowing of the vibronic RXS band results from detuning the excitation Photon frequency omega away from the absorption resonance. By fine tuning the frequency, this may under special circumstances also occur in the region of strong photoabsorption. In the case of elastic Rayleigh scattering, that is, when the potential surfaces of ground and final states are identical, the narrowing results in a total collapse to a single resonance by detuning the frequency. The theory predicts how the differencies in vibrational structure of resonant and nonresonant photoemission spectra depends on the excitation frequency. The effect of frequency detuning on complex spectral multilevel structures due to multiplet: and spin-orbit splittings is discussed qualitatively. It is shown that the notion of: duration time for the x-ray scattering process plays a crucial role in the understanding of RXS spectra.

Place, publisher, year, edition, pages
1997. Vol. 56, no 1, 256-264 p.
Keyword [en]
AUGER-SPECTRA, EXCITATION, EMISSION, INTERFERENCE, SYMMETRY, STATES, DECAY
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-13635ISI: A1997XL64500030OAI: oai:DiVA.org:kth-13635DiVA: diva2:326277
Note
QC 20100622Available from: 2010-06-22 Created: 2010-06-22 Last updated: 2017-12-12Bibliographically 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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Ågren, Hans

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