XeF2 is a linear molecule with vibrational frequencies of 515 cm–1 (symmetric

Question

stretch), 555 cm–1 (antisymmetric stretch) and 213 cm–1 (bend). A vibrational
Raman spectrum is acquired using radiation at 488 nm from an argon-ion
laser. Predict, with justification, which fundamental modes will be observed
and calculate the wavelengths of the associated Stokes and anti-Stokes lines.

I think the 515cm-1 mode will be the only Raman active one. I'm not sure how to calculate the wavelengths associated with the Stokes and anti-Stokes lines. What equation should I use?