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Fig.
7.
Variation
of
extinction
coecient
and
optical
thickness
with
seeding
temperature.
and optical thickness with seeding temperature is presented in Fig. 7. These
curves are prepared from the scattering intensities at 30 . As expected,
the curves for both the parameters have three peaks at
21 C, close
8 C. A plot for extinction coecient and the ratio of
scattering intensity at 30 to extinction coecient against time counted
from the instant of seeding is presented in Fig. 8. Time variation of
extinction coecient from the instant of seeding is also presented in the
same figure. The curve becomes almost flat only 15 s after seeding. During
the later period, the actual intensity shows some fluctuations though the
above-mentioned ratio remains more flat. This result confirms an earlier
observation made by Saunders et al. 34
14 C, and
to
4.7 . Growth and decay of crystals
The growth and decay of scattering intensity with time, and the
corresponding fall and rise of direct intensity are presented in Fig. 9. This
is only a representative curve, and only two scattering angles of 30 and
36 are presented. Time is again counted from the instant of seeding. The
diagram clearly reveals growth and subsequent fall of the crystals. From the
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