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where I = Intensity of the direct beam after scattering,
I 0 = Initial intensity of the direct beam,
σ
= extinction coecient,
= thickness (here, it is the diameter of the vessel).
So, the extinction coecient,
T
σ
=(1
/T
)ln(
I 0 /I
), and the optical thickness
is
τ
=
σT
=ln(
I 0 /I
).
4. Experimental Results and Discussion
4.1 . Variation of crystal count and dimension
with seeding temperature in case of DMSO
The variation of crystal count with seeding temperature is represented in
Fig. 2. At each value of seeding temperature, the seeding was done four
times, the range of which was at best within 0.4 C. The seeding temperature
presented in the figure was actually the mean of the four temperature
values. There were two slides, and in each slide, 10 random observations
were made by the microscope. The modal value of the dimension of all
crystals measured in 80 fields of view of the microscope at a particular
seeding temperature is also presented in the same figure. The variation
Fig. 2. Crystal count and modal value of crystal dimension against seeding temperature
when DMSO is seeded.
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