Electric-Dipole–Quadrupole Interference of Overlapping Autoionizing Levels in Photoelectron Energy Spectra
N. L. S. MartinDepartment of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055David B. ThompsonDepartment of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055Robert P. BaumanDepartment of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055C. D. CaldwellDepartment of Physics, University of Central Florida, Orlando, Florida 32816Manfred O. KrauseDepartment of Physics, University of Central Florida, Orlando, Florida 32816S. P. FrigoDepartment of Physics, University of Central Florida, Orlando, Florida 32816M WilsonPhysics Department, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
1998en
ABI
Аннотация
We have measured the photon energy dependence of electric-dipole--quadrupole interference in cadmium between the odd parity ${4d}^{9}{5s}^{2}5p$ $J\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ and even parity $5p6p{}^{3}{P}_{2}$ autoionizing levels. The resonant interference structure is isolated by taking the difference between constant ionic state spectra at $45\ifmmode^\circ\else\textdegree\fi{}$ with respect to the photon beam in the forward and backward directions. We find interference effects that are approximately 0.5% of the dipole cross section for photon energies of 13 eV, in good agreement with theory. We compare the results with those from $(e,2e)$ experiments.
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