
April 25, 2014 15:23 PSP Book - 9in x 6in 07-Rashid-A.-Ganeev-c07
Ablation of Nanoparticles and Efficient Harmonic Generation Using 1 kHz Laser 273
note that the appearance of ionic lines in these spectra is related
with the presence of relatively large amount of free electrons in the
plasma plume.
Their role in worsening of the conditions of HHG has been a
topics of studies during long time both for gas harmonics and plasma
harmonics. It has been reported [4] that strong harmonic emission
from monoparticle plasmas was obtained when no plasma lines
from excited ions appear in the XUV spectra. The simultaneous
appearance of strong harmonics and spectral ...