How to get/count refractive index in gasses?

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Frank T. Edelmann

Dear Stepan Jirman thank you for the interesting question. For some general information about this topic please see this article entitled

Refractive Index of Gases (Rayleigh-Loewe-Interferometer)

https://home.uni-leipzig.de/prakphys/pdf/VersucheIPSP/Optics/O-08e-AUF.pdf

Dear Stepan Jirman The following article might also be useful for your purposes. The paper is entitled

Accurate measurement of refractive index of gases using a laser interferometer

https://iopscience.iop.org/article/10.1088/0150-536X/22/3/006/pdf

The article is freely available as public full text on the general internet.

Dear Stepan Jirman you're welcome! great to hear that my answer was helpful.

By the way, many years ago we had a fruitful collaboration with colleagues from the University of Pardubice. Please see e.g. this joint paper which resulted from that collaboration:

Article [(Dimethylamino)methyl]ferrocene as an Amine Ligand: Study o...

The article is freely available as public full text on RG.

Ishfaq Chohan

In a same type of problem, I m struggling to find/calculate the refractive indexes of some suspensions... Any suggestion for me please???

Dear Ishfaq Chohan "I m struggling to find/calculate the refractive indexes of some suspensions...": I just came across a potentially useful reference which is entitled

Refractive-index and density matching in concentrated particle suspensions: A review

Article Refractive-index and density matching in concentrated partic...

This article is freely available as public full text on RG. I hope it helps. As being a review article it should also contain a good number of further references which you could chechk.