Dynamical orbital collapse drives super x-ray emission

Abstract
Experimental studies of the characteristics of Xe(M) emission ( - 19 Å) produced by multiphoton excitation of Xe clusters indicate that the nonlinear interaction automatically acts as a template leading to the preparation of the maximally radiating configurations for that spectral range. The new mechanism deduced is a general multiphoton multi-electron process which dynamically combines rapid multiphoton ionization, 4f-orbital collapse, and correlated electron motion.