Div. of Synchrotron Radiation Research


A. Baev, R. Feifel, F. Gelmukhanov, H. Agren, M. N. Piancastelli, M. Bassler, C. Miron, S. L. Sorensen, A. Naves de Brito, O. Bjorneholm, L. Karlsson and S. Svensson
Geometrical information on core-excited states obtained from interference quenching of vibrational states in resonant x-ray photoemission
Phys. Rev. A 67, 022713 (2003)

An interference quenching of the m=1 final state vibrational in in the resonant Auger decay of N 1s-p* core-excited N2 is observed and analyzer. The intensity ratio between the m=1 and M=0 vibrational levels of the X 2Sigma_g^+ final state shows a surprising nonmonotonic variation as a function of frequency detuning, going through a minimum wiht a complete supression of m=1. We have developed a simple model which indicates a linear relation between the value of the detuning frequency for this minimum and the equilibrium bond distances for the core-excited states to a high degree of accuracy. Simultaneously with the simple model we present a strict theory of the studied effect.

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