Nondipole asymmetries of Kr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>s</mml:mi></mml:math>photoelectrons

Nondipole asymmetries of Kr $1s$ photoelectrons were measured over the 11--8000 eV kinetic-energy range. Symmetry properties of angular distributions were exploited to eliminate the dependence of the measurements on the dipole anisotropy and the polarization properties of the photon beam. The measured asymmetries agree well with both full multipole relativistic and nonrelativistic first-order retardation calculations within the independent-particle approximation. Deviations of the measured asymmetries from predictions of the point-Coulomb retardation correction confirm the importance of screening on the continuum-wave normalizations and phase shifts.