Two-photon excitation and relaxation of the 3d-4d resonance in atomic Kr
Meyer, M. and Cubaynes, D. and Richardson, Vincent and Costello, John T. and Radcliffe, P. and Li, W. B. and Düsterer, S. and Fritzsche, S. and Mihelic, A. and Papamihail, K. G. and Lambropoulos, P. (2010) Two-photon excitation and relaxation of the 3d-4d resonance in atomic Kr. Physical Review Letters, 104 (21). pp. 213001-1. ISSN 0031-9007
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Two-photon excitation of a single-photon forbidden Auger resonance has been observed and investigated using the intense extreme ultraviolet radiation from the free electron laser in Hamburg. At the wavelength 26.9 nm (46 eV) two photons promoted a 3d core electron to the outer 4d shell. The subsequent Auger decay, as well as several nonlinear above threshold ionization processes, were studied by electron spectroscopy. The experimental data are in excellent agreement with theoretical predictions and analysis of the underlying multiphoton processes.
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