Orientation in the 3P-3S transition in sodium induced by electron impact

Evolution of molecular states studied in collisions of ions with laser excited atoms by a crossed beam experiment

“…been illustrated in a recent paper by Hermann and Hertel [23] which is based on the methods derived by Fano and Macek [24] for the evaluation of particle-photon coincidences and by Macek and Hertel [25] for electron scattering by laser excited atoms. We cannot repeat here in detail the discussion given in [23]. So we will only summarise the main aspects of the concepts used there together with the formulas necessary for evaluation of our experimental data.…”

Alignment and orientation of the hyperfine levels of a laser excited Na-atom beam

“…Atom beam density 7 x 109/cm 3 orientation effects. Fortunately, for the study of collisionally induced orientation parameters a combination of a 0 and o 0 enters into the evaluation of the scattering data which is less sensitive [35]. On the other hand, in some experiments it may be desirable to study scattering from a completely isotropic distribution of excited states.…”

Applications of Lasers to Collision Studies

“…The initial experiments of Hertel and Stoll (1974) were performed on e--Na atom collisions, over the energy range 5· 1 eV to 22· 1 eV and with the laser beam incident in the scattering plane. Later measurements by this group (Hermann et al 1980) were performed with the laser beam incident from out of the plane.…”

“…Later measurements by this group (Hermann et al 1980) were performed with the laser beam incident from out of the plane. Other superelastic scattering experiments on sodium have been performed by Scholten et al (1988) andFarrell et al (1989) using a laser beam perpendicular to the scattering plane.…”

“…Measurements were made by Hertel and Stoll (1974) of the differential cross sections for the 3 2 P-4 2 S and 3 2 P-3 2 0 transitions, where the initial 3 2 P state was prepared by laser excitation. Hermann et al (1977) showed how angular correlation parameters could be obtained for these transitions using type II stepwise techniques.…”