Natural Circular Dichroism Spectra of Alanine and Valine Films in Vacuum Ultraviolet Region

Abstract

Natural circular dichroism (CD) of alanine (Ala) and valine (Val) films were measured in vacuum ultraviolet region using a polarizing undulator as a circularly polarized light source. Compared with absorption spectra, CD spectra showed clear differences between Ala and Val films. In order to explain these differences, a time-dependent density functional theory was applied to calculated CD spectra. The calculated CD spectra showed good agreement with the experimental CD spectra.