chosen to give the widest choice of popular values. There are many reference
books available that state the refractive indices of materials.
Instrument First
character
Relative
particle
refractive
index (real)
Second
character
Relative
refractive
index
(imaginary)
Third
character
Dispersant
refractive
index
Fourth
characte
r
Mastersizer X 2 0.5 A 0 A 1 A
Mastersizer S 3 0.75 B 0.0001 B 1.2 B
1.001 C 0.0003 C 1.3 C
1.002 D 0.001 D 1.33 D
1.003 E 0.003 E 1.4 E
1.005 F 0.01 F 1.5 F
1.007 G 0.03 G 1.6 G
1.01 H 0.1 H 1.7 H
1.015 I 0.3 I
1.02 J 1 J
1.03 K 3 K
1.045 L
1.065 M
1.095 N
1.15 O
1.2 P
1.3 Q
1.45 R
1.65 S
1.95 T
2.35 U
3V
The third character represents the imaginary refractive index of the sample, (this
is effectively its absorption). If the particle has an imaginary refractive index of
0.003 then the third character will be E, if it has a value of 0.1 then the third
character will be H etc. Choosing the value for the imaginary refractive index can
be difficult as the value has to be calculated by performing an experiment.
CHAPTER 5
Getting Started
Page 5.4
MAN 0101
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