L. Quaglia et C. Cornaggia, Experimental evidence of excited multicharged atomic fragments coming fromlaser-induced Coulomb explosion of molecules, PHYS REV L, 84(20), 2000, pp. 4565-4568
Direct experimental evidence is presented for the production of excited mul
ticharged atomic fragments in the laser-induced Coulomb explosion of molecu
les. The comparison of the fluorescence signals of several atomic and molec
ular species shows that the excited fragments come from transient excited m
ulticharged molecules. The atomic fluorescence spectra recorded with NH3, N
-2, and N2O, in the 50-120 nm wavelength range, show that the excitation in
creases noticeably from NH3 to N2O. This effect is interpreted in terms of
the initial electronic configuration, which favors a stronger excitation wh
en the electronic density is more delocalized on the molecular nuclear stru
cture.