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Duration of x-ray Raman scattering
KTH, Superseded Departments, Biotechnology.
KTH, Superseded Departments, Biotechnology.
KTH, Superseded Departments, Biotechnology.
KTH, Superseded Departments, Biotechnology.ORCID iD: 0000-0002-1763-9383
1999 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 59, no 1, 380-389 p.Article in journal (Refereed) Published
Abstract [en]

There has recently been much interest in using the notion of a duration time to analyze resonant x-ray Raman scattering (RXS) of atoms, molecules, and solids. This notion implies a selection of processes with different time scales responsible for the formation x-ray Raman spectra, and has been useful for actual predictions of various phenomena associated with RXS and that subsequently have been experimentally verified. However, the notion of a duration time for the x-ray scattering event can also have some paradoxical consequences, as when comparing the RXS duration with the relaxation time of the wave packet evolution in the case when the inverse detuning of the excitation energy is shorter than the time of flight or the lifetime of the core excited state. We present here a solution of this contradiction and give a detailed analysis of the notion of the duration time for RXS. It is shown that this time is complex and consists of two qualitatively different contributions. The first originates in the irreversible decay of the core excited state, while the imaginary part is caused by a reversible dephasing in the time domain. We investigate also the evolution of the wave packets of bound and dissociative states to stationary distributions. The theoretical analysis is accompanied by numerical examples of the time evolution of the wave packet in bound and dissociative core excited states of the N2 and HCl molecules.

Place, publisher, year, edition, pages
1999. Vol. 59, no 1, 380-389 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-13608DOI: 10.1103/PhysRevA.59.380OAI: oai:DiVA.org:kth-13608DiVA: diva2:326177
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
3. Wave packet theory of resonant X-ray scattering
Open this publication in new window or tab >>Wave packet theory of resonant X-ray scattering
2001 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2001. x, 43 p.
Keyword
RXS, x-ray scattering, wave packets
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-3188 (URN)91-7283-111-1 (ISBN)
Public defence
2001-06-11, 00:00
Note
QC 20100629Available from: 2001-06-08 Created: 2001-06-08 Last updated: 2010-06-30Bibliographically approved

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Ågren, Hans

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