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 language | English |
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Pages (from-to) | 1101-1103 |
Number of pages | 3 |
Journal | Journal of Electron Spectroscopy and Related Phenomena |
Volume | 144-147 |
DOIs | |
Publication status | Published - 2005 Jun |
Externally published | Yes |
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