Circular dichroism measurement of soft X-ray absorption using helicity modulation of helical undulator radiation

T. Muro, T. Nakamura, T. Matsushita, H. Kimura, T. Nakatani, T. Hirono, T. Kudo, K. Kobayashi, Y. Saitoh, M. Takeuchi, T. Hara, K. Shirasawa, H. Kitamura

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The measurement of circular dichroism (CD) in soft X-ray absorption at BL25SU of SPring-8 has been developed into a phase-sensitive detection using helicity modulation (HM) of circularly polarized light. The HM is performed by the light source, "twin helical undulators". A lock-in amplifier is used for the phase-sensitive detection to extract small CD signals buried in noises. The noise level of a measured magnetic CD has been reduced to less than 1/10 by using this method in comparison with a normal integration measurement.

Original languageEnglish
Pages (from-to)1101-1103
Number of pages3
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume144-147
DOIs
Publication statusPublished - 2005 Jun
Externally publishedYes

Keywords

  • Circular dichroism
  • Helical undulator radiation
  • Helicity modulation
  • Soft X-ray absorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Circular dichroism measurement of soft X-ray absorption using helicity modulation of helical undulator radiation'. Together they form a unique fingerprint.

Cite this