How Accurate Are Calculated Diffusion Coefficients of H2 and He into Air?

[Clausius2]

I have calculated the coefficient of diffusion of H2 into Air and He into Air as Hirschfelder do so based on Lennard Jones Potential in his book about "Molecular Theory of Gases and Liquids". My figures are:

$$D_{H_2-Air}=7,78 \cdot 10^{-5} m^2/s$$

$$D_{He-Air}=7,17 \cdot 10^{-5} m^2/s$$

both of them for $$T=300K$$ and $$P=1atm$$. I am looking for experimental validation. I have searched in the web for tables, and in my library for handbooks, but I have not found any interesting. Do you have some experimental table which can confirm my calculated coefficients?

Thanks.

 

[Chestermiller]

From the Engineering Toolbox, H2 = 0.756 cm^2/sec and He = 0.697 cm^2/sec at room temperature.