Electron scattering by ytterbium: II. Excitation of the 4f14(6s6p 3P1, 5d6s 1D2 and 6s7p 1P1) and 4f135d6s2 (7/2, 5/2)1 states

Differential cross sections (DCSs) for electron-impact excitation of the 4f146s6p3P1 (2.231 eV) state of ytterbium have been determined experimentally at incident electron energies, E0 = 10, 20 and 40 eV, and scattering angles (θ) from 2 deg. to 150 deg. (at 10 eV from 10 deg.). Also, DCSs for the 4f145d6s 1D2 (3.432 eV) and 4f135d6s2 (7/2, 5/2)1 (3.578 eV) states at E0 = 10 and 20 eV, and the 4f146s7p 1P1 (5.029 eV) state at 20 and 40 eV have been measured. These measurements were performed at θ between 100 and 1500 for the 4f145d6s 1D2 and 4f135d6s2 (7/2, 5/2)1 states, and between 2 deg. and 150 deg. for the 4f146s7p 1P1 state. The inelastic-to-reference inelastic (the 4f146s6p 1P1 resonance state) intensity ratios were obtained from energy-loss spectra recorded with overall energy resolution of 65 meV (FWHM) and angular resolution of 1.50. Using these ratios and DCSs for the reference state (Predojevic et al 2005 J. Phys. B: At. Mol. Opt. Phys. 38 1329) the absolute inelastic DCSs were determined. In this way the obtained DCSs were extrapolated to 0 deg. and 180 deg. and numerically integrated to yield integral, momentum transfer and viscosity cross sections. Our results are compared with available calculated values and experimental data