
April 25, 2014 11:1 PSP Book - 9in x 6in 06-Rashid-A.-Ganeev-c06
Calculations of Plasma Formation for Harmonics Generation 221
that, for graphite, the reflection coefficient is relatively small and
decreases with the increase of surface irregularity. So, it can safely be
assumed as 0. The Brown module was considered as α = 0.01
˚
A
−1
.
Sample surface depth was obtained from one-dimensional density
estimate during each time-step. The positions and velocities of all
carbon atoms were fixed every 50 fs. The velocity distribution was
analyzed by counting the number of particles, which have the veloc-
ities sufficient to be in a given region (∼200 μm above the ablated ...