Circular dichroism in the photoelectron angular distribution from randomly oriented enantiomers of camphor

摘要

Cicualr dichroism in the angular distribution of valence photoelectrons emitted from randomly oriented chiral molecules has been observed in experiments that tuse circualrly polarized UVV synchrotron radiation.photoionization of the outermost carbonyl oxygen lone pair electrons from pure enantiomers of the prototype chiral molecule camphor is shown to have an asymmetry in the forward-backward scattering os phtotoelectrons (relative to the propagation direction of the light beam) of magnitude approaching 3% at 9.2eV photon energy.The asymmetry reverses on exchange of either the helicity of the radiation or of the molecualr enantiomer,confirming theoretical predictions of an effect that arises in the pure electric-dipole approximation.