Circular dichroism in photoelectron spectroscopy of free chiral molecules: Experiment and theory on methyl-oxirane

We report a joint experimental and theoretical study of circular dichroism in the valence photoelectron spectra of a free chiral molecule. The circular dichroism in photoelectron spectroscopy is measured at the magic angle for various valence states of $R(+)$ and $S(-)$ methyl-oxirane enantiomers in the vapor phase. The maximum dichroism measured is about $5\times {10}^{-2}$. Experimental and theoretical results are in agreement. The ab initio calculation employs a multicentric basis set of B-spline functions and a Kohn-Sham Hamiltonian.