title: First observation of natural circular dichroism spectra in the extreme ultraviolet region using a polarizing undulator-based optical system and its polarization characteristics.
abstract: Natural circular dichroism (CD) spectra in the extreme ultraviolet (EUV) region down to a wavelength of 80 nm have been observed for the first time, using an alanine thin film deposited on sodium salicylate coated glass as a sample. Calibrated EUV-CD spectra of L-alanine exhibited a large negative peak at around 120 nm and a positive CD signal below 90 nm, which were roughly predicted by theoretical calculations. A CD measurement system with an Onuki-type polarizing undulator was used to obtain the EUV-CD spectra. This CD system, the development of which took five years, can be used to observe even weak natural CD spectra. The polarization characteristics of this system were also evaluated in order to calibrate the recorded CD spectra.
authors.affiliation: Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, Central 2, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan. masahito-tanaka@aist.go.jp
authors.forename: Masahito
authors.initials: M
authors.lastname: Tanaka
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Yagi-Watanabe
authors.forename: Fusae
authors.initials: F
authors.lastname: Kaneko
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Nakagawa
mesh_terms: D000409:Alanine; D002138:Calibration; D002942:Circular Dichroism / Q000295:instrumentation / Q000379:methods*; D014466:Ultraviolet Rays
chemical_list: D000409:Alanine