Ab. Borisov et al., DYNAMICAL ORBITAL COLLAPSE DRIVES SUPER X-RAY-EMISSION, Journal of physics. B, Atomic molecular and optical physics, 29(2), 1996, pp. 247-255
Experimental studies of the characteristics of Xe(M) emission (similar
to 12-19 Angstrom) produced by multiphoton excitation of Xe clusters
indicate that the nonlinear interaction automatically acts as a templa
te leading to the preparation of the maximally radiating configuration
s for that spectral range. The new mechanism deduced is a general mult
iphoton multi-electron process which dynamically combines rapid multip
hoton ionization, 4f-orbital collapse, and correlated electron motion.