English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  An unexpectedly low oscillator strength as the origin of the Fe xvii emission problem.

Bernitt, S., Brown, G. V., Rudolph, J. K., Steinbrügge, R., Graf, A., Leutenegger, M., et al. (2012). An unexpectedly low oscillator strength as the origin of the Fe xvii emission problem. Nature, 492(7428), 225-228. doi:10.1038/nature11627.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B91E-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-84E5-8
Genre: Journal Article

Files

show Files
hide Files
:
1677292.pdf (Publisher version), 671KB
Name:
1677292.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Bernitt, S., Author
Brown, G. V., Author
Rudolph, J. K., Author
Steinbrügge, R., Author
Graf, A., Author
Leutenegger, M., Author
Epp, S. W., Author
Eberle, S., Author
Kubicek, K.1, Author              
Mäckel, V., Author
Simon, M. C., Author
Träbert, E., Author
Magee, E. W., Author
Beilmann, C., Author
Hell, N., Author
Schippers, S., Author
Müller, A., Author
Kahn, S. M., Author
Surzhykov, A., Author
Harman, Z., Author
Keitel, C. H., AuthorClementson, J., AuthorPorter, F. S., AuthorSchlotter, W., AuthorTurner, J. J., AuthorUllrich, J., AuthorBeiersdorfer, P., AuthorLópez-Urrutia, & J. R. Crespo, Author more..
Affiliations:
1Research Group of Structural Dynamics of (Bio)chemical Systems, MPI for biophysical chemistry, Max Planck Society, ou_578564              

Content

show
hide
Free keywords: -
 Abstract: Highly charged iron (Fe161, here referred to as Fe XVII) produces some of the brightest X-ray emission lines from hot astrophysical objects1, including galaxy clusters and stellar coronae, and it dominates the emission of the Sun at wavelengths near 15 a˚ngstro¨ms. The Fe XVII spectrum is, however, poorly fitted by even the best astrophysical models. A particular problem has been that the intensity of the strongest Fe XVII line is generally weaker than predicted2,3. This has affected the interpretation of observations by the Chandra and XMM-Newton orbiting X-ray missions1, fuelling a continuing controversy over whether this discrepancy is caused by incomplete modelling of the plasma environment in these objects or by shortcomings in the treatment of the underlying atomic physics. Here we report the results of an experiment in which a target of iron ions was induced to fluoresce by subjecting it to femtosecond X-ray pulses from a free-electron laser4; our aim was to isolate a key aspect of the quantum mechanical description of the line emission. Surprisingly, we find a relative oscillator strength that is unexpectedly low, differing by 3.6s from the best quantum mechanical calculations. Our measurements suggest that the poor agreement is rooted in the quality of the underlying atomic wavefunctions rather than in insufficient modelling of collisional processes.

Details

show
hide
Language(s): eng - English
 Dates: 2012-12-12
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/nature11627
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Nature
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 492 (7428) Sequence Number: - Start / End Page: 225 - 228 Identifier: -