A. Mcpherson et al., MULTIPHOTON INDUCED X-RAY-EMISSION FROM KR CLUSTERS ON M-SHELL (SIMILAR-TO-100-ANGSTROM) AND L-SHELL (SIMILAR-TO-6-ANGSTROM) TRANSITIONS, Physical review letters, 72(12), 1994, pp. 1810-1813
Experiments demonstrating the role of cluster formation on multiphoton
-induced x-ray emission and the scaling of this phenomenon into the ki
lovolt range have been performed on Kr. For the Kr M shell, augmentati
on of Kr(n) formation leads to a large increase in Kr9+ (4p --> 3d) em
ission (approximately 100 angstrom) and the appearance of a strong ban
d at approximately 90 angstrom. The observation of L-shell transitions
(approximately 5-7.5 angstrom) demonstrates the scaling of this pheno
menon into the kilovolt region and leads to the conclusion that the in
teraction produces direct inner-shell excitation with the emission of
prompt x rays.