Tuning of X-ray phase retarder for magnetic EXAFS spectroscopy in helicitymodulation mode

Citation
M. Suzuki et al., Tuning of X-ray phase retarder for magnetic EXAFS spectroscopy in helicitymodulation mode, J SYNCHROTR, 8, 2001, pp. 357-359
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SYNCHROTRON RADIATION
ISSN journal
0909-0495 → ACNP
Volume
8
Year of publication
2001
Part
2
Pages
357 - 359
Database
ISI
SICI code
0909-0495(200103)8:<357:TOXPRF>2.0.ZU;2-#
Abstract
A technique for polarization tuning over a wide energy range has been devel oped for magnetic EXAFS spectroscopies using a diamond x-ray phase retarder in helicity modulation mode. A quick rocking scan using a piezo stage enab led us to tune the angle of retarder crystal with the precision of +/-2 arc second within 1 s. Available energy range of circular dichroism measurement s has been extended to 6-16 keV by adopting not only undulator gap scan but also the present tuning technique. This technique has been applied to magn etic EXAFS measurements in pure iron at the Fe K-edge. Higher signal-to-noi se ratio was obtained in reduced data acquisition time.