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Single ionization of noble gas atoms by linearly polarized synchrotronradiation has been studied by employing angle- and energy-resolvedphotoelectron spectroscopy. The measurements were carried out in the planedefined by the momentum and polarization vectors of the photon. Parametersdescribing the left-right asymmetry (LRA) (relative to the photon propagationdirection) of the photoelectron angular distribution were determinedexperimentally for the $s$-shells of He, Ne, Ar, Kr and Xe atoms and H$_2$molecules and for the $p$-shells of Ne, Ar, Kr and Xe atoms. The values of theleft-right asymmetry differ significantly from zero for both subshells. Thephoton and photoelectron energy dependence of the LRA parameters are presentedalso. Possible experimental and instrumental sources that could generateasymmetry are discussed and excluded as well.

Experimental investigation of left-right asymmetry in photon-atom interaction