Coincident measurement of photo-ion circular dichroism and photo-electron circular dichroism in 1-phenylethylamine

Abstract

Here, we report the coincident measurement of PICD and PECD effects in 1-phenylethylamine upon multiphoton ionization. Both photo-ion circular dichroism (PICD) and photo-electron circular dichroism (PECD) are methods to distinguish enantiomers. In PICD, a difference in total ion yields upon multiphoton ionization with circular polarized light is measured, whereas, in PECD, circular dichroism is observed in the angular distribution of the photoelectrons. Here, we report on our continuous effort to measure the PICD and PECD effects in coincidence, i.e. simultaneously under the same measurement conditions using a home-built photoion–photoelectron coincidence spectrometer. Pure samples of R-(+)-1-phenylethylamine and S-(−)-1-phenylethylamine have been photo-ionized using a femtosecond laser operated at 394 nm.