Micromeritics ASAP 2460 - Interaction Parameter

Appendix C ASAP 2460 Operator’s Manual
C-30 246-42800-01 - Aug 2013
Interaction Parameter
The interaction parameter (IP) results from the following calculations:
The Kirkwood-Muller dispersion coefficients
where

A
= polarizability of gas molecule (cm
3
)

S
= polarizability of sample atoms (cm
3
)
mc
2
= kinetic energy of electron (0.8183 × 10
-6
erg)

A
= diamagnetic susceptibility of gas molecule (cm
3
)
where:
N
A
= number of gas molecules/cm
2
at monolayer from the Horvath-Kawa-
zoe Physical Properties window
N
S
= number of sample atoms/cm
2
from the Horvath-Kawazoe Physical
Properties window

S
= diamagnetic susceptibility of sample atom (cm
3
)
Refer to Interaction Parameter Components, page C-32 for recommended values.
A
S
6mc
2
a
S
a
A

S

S
------

A

A
-------
+
--------------------------
=
A
A
3mc
2

A

A
2
---------------------------
=
IP N
A
A
A
N
S
A
S
+=