
April 25, 2014 11:1 PSP Book - 9in x 6in 06-Rashid-A.-Ganeev-c06
236 Characterization of Plasma Harmonics
growth of crystalline deposits as observed by SEM (Fig. 6.16) [102,
103]. In addition, the higher degree of atomization in the thymine
plume (appearing as atomic ions) will lead to a higher density of
plasma-free electrons. Free electrons will contribute abundantly in
the case of thymine to phase mismatch, which is known to have a
clear detrimental effect upon HHG efficiency [104].
Summarizing this section, we have discussed the first studies
of the HHG of laser radiation from laser ablation plumes of the
RNA nucleobase uracil. Harmonics were observed ...