Photoelectron angular distributions from laser-excited aligned Yb atoms ionized by vacuum ultraviolet radiation

Using linearly polarized Ar I line radiation for ionization, the energy- and angle-resolved photoemission from CW-laser-excited aligned Yb atoms in the (6s6p) 3 P 1 state is studied. Photoelectron angular distributions have been measured for different orientations of the laser polarization vector relative to the polarization vector of the ionizing radiation. From polynomial fit coefficients for these distributions the ratio of reduced dipole matrix elements and the phaseshift difference for the transitions 6p to in s and 6p to in d have been obtained at a photoelectron energy of 7.8 eV.