Interaction Parameter - Micromeritics TriStar II 3020 Operator's Manual

TriStar II 3020

Interaction Parameter

The interaction parameter (IP) results from the following calculations:
The Kirkwood-Muller dispersion coefficients -

6 MC
---------------------------------------------- -
=
A

S
S
----- -

S

3 MC
---------------------------------------------- -
=
A
A
where
2
MC =

=
S

=
A

=
S

=
A

=
IP N
A
where:
N =
A
N =
S
Refer to Interaction Parameter Components later in this Appendix for recommended values.
302-42828-01 - Dec 2012
2
   
S A

A
------
+

A
2
   
A A
2
kinetic energy of electron (0.8183 x 10
polarizability of sample atoms (cm
polarizability of gas molecule (cm
diamagnetic susceptibility of sample atom (cm
diamagnetic susceptibility of gas molecule (cm
    
+
A N A
S S
A
number of gas molecules/cm
cal Properties dialog
number of sample atoms/cm
dialog 
-6
erg)
3
)
3
)
3
)
3
)
2
at monolayer from the Horvath-Kawazoe Physi-
2
from the Horvath-Kawazoe Physical Properties
Appendix C
C-23