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Abstract:
The spin-polarisation parameters for photoelectrons from lead atoms (6s26p2)J = 0 were measured in the wavelength range between the second threshold [Pb+ (6s26p) 2P3/2] and 100 nm in an angle-resolving experiment using circularly polarised vuv-radiation from the storage ring BESSY. Beyond this threshold (λ = 135.3 nm), the photoionisation cross section is strongly perturbed by autoionisation resonances. Especially, a strong enhancement of the generally weak Pb+ (6s26p) 2P3/2 photoionisation cross section occurs. Theoretical calculations by Radojevic [15] attribute these resonances to the 6s6p3-configuration of lead. By use of the measured spin-polarisation parameters A, ξ and α which show pronounced variations in the region investigated for both final ionic states 2P1/2 and 2P3/2 a detailed discussion of the resonances is performed.
