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Angle- and Spin-Resolved Photoelectron Spectroscopy

1985; Springer Nature; Linguagem: Inglês

10.1007/978-1-4613-2125-5_10

0258-1221

U. Heinzmann,

Photochemistry and Electron Transfer Studies

Experimental analysis of the photoelectron-spin polarization vector in photoionization using circularly polarized light (Fano effect1) was up to 1984 restricted to angle-integrated measurements2 without resolution of the kinetic energy of the photoelectrons corresponding to different ionic states. With the development of the new German dedicated electron storage ring for synchrotron radiation BESSY in Berlin, a light source of circularly polarized vacuum ultraviolet (vuv) radiation with sufficiently high intensity has become available, which makes angle- and energy-resolved spinpolarization transfer studies from circularly polarized radiation onto photoelectrons feasible. These measurements could be performed with free atoms,3,4 atoms adsorbed on solid surfaces5,6 as well as with a solid state system7 even in a photon energy range ≧ 10 eV, where conventional methods for producing circularly polarized radiation break down because no transparent or even double refracting material exists. These studies using circularly polarized radiation complement recent photoelectron spectroscopy measurements with free randomly oriented8 as well as free oriented molecules9. One of the reasons why these experiments have been done is to find a set of parameters measured in the experiments which characterize the photoemission process quantummechanically completely.