Is P_Rb formula valid for large magnetic field?

[ahrendsen]

Our rubidium polarization formula has somewhat mysterious origins. I believe I used the formula that was in Munir's thesis. I am only aware of one paper that lists a formula for the polarization, which is Ueno - 1987 (attached).

Ueno et al - 1987 - Faraday Rotation of Optically Pumped Sodium Vapour in a Weak Magnetic Field.pdf

The paper specifically notes that it's for a weak magnetic field, which for sodium was less than 600 G. We are well under 600 G, so up until now I assumed that we were fine with Rubidium, but it would be good to explicitly verify this. The paper describes how to find the critical field, but my Google skills weren't good enough for me to find the g-factor of the sodium atom in less than 5 minutes, so I'm adding this as a project to figure out later. I was attempting to first verify that I get 600 G for sodium using their formula, then would also calculate it for Rubidium.