Home > Types > Articles > Emitter-site-selective photoelectron circular dichroism of trifluoromethyloxirane
Emitter-site-selective photoelectron circular dichroism of trifluoromethyloxirane
Hartmann, G.
Rupprecht, P.
Artemyev, A. N.
Coffee, R. N.
Li, Z.
Ohldag, H.
Ogasawara, H.
Osipov, T.
Ray, D.
Schmidt, Ph.
Wolf, T. J. A.
Ehresmann, A.
Moeller, S.
Knie, A.
Demekhin, Ph. V.
Ilchen, M.
EuXFEL staff, Other
Instrument SQS
Scientific area:
The angle-resolved inner-shell photoionization of R-trifluoromethyloxirane, ${\mathrm{C}}_{3}{\mathrm{H}}_{3}{\mathrm{F}}_{3}\mathrm{O}$, is studied experimentally and theoretically. Thereby, we investigate the photoelectron circular dichroism (PECD) for nearly symmetric O $1s$ and F $1s$ electronic orbitals, which are localized on different molecular sites. The respective dichroic $\beta_{1}$ and angular distribution $\beta_{2}$ parameters are measured at the photoelectron kinetic energies from 1 to 16 eV by using variably polarized synchrotron radiation and velocity map imaging spectroscopy. The present experimental results are in good agreement with the outcome of ab initio electronic structure calculations. We report a sizable chiral asymmetry $\beta_{1}$ of up to about 9% for the $K$-shell photoionization of oxygen atom. For the individual fluorine atoms, the present calculations predict asymmetries of similar size. However, being averaged over all fluorine atoms, it drops down to about 2%, as also observed in the present experiment. Our study demonstrates a strong emitter and site sensitivity of PECD in the one-photon inner-shell ionization of this chiral molecule.
Physical Review A: Atomic, Molecular, and Optical Physics, 95, 053423 (2017)
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.95.053423
Fulltext: PhysRevA.95.053423 - PDF;