I read some article about Rayleigh scattering. There is a constant, dielectric function of bulk material. For Ar, it is 1.68. I want to know the number of other materials. Is there any method to calculate it ? Or any information about bulk dielectric constant.
Measurement of the average size and density of clusters in a gas jet
K. Y. Kim, V. Kumarappan, and H. M. Milchberg