Abstract : The collisional dynamics of the 5(2)P levels in rubidium has been examined using steady-state laser absorption nd spectrally-resolved laser induced fluorescence techniques. State-to-state cross-sections for energy transfer between Zeeman split levels ranged from 16-248 A2 for collisions with nitrogen and rare gases. These energy transfer cross-sections exhibit a significant dependence on (J,mj) state and certain symmetry relationships are demonstrated. A sub-Doppler spectrum of the Zeeman split levels indicating the isotopic shift in the D1 line of 106 plus or minus 35 was obtained using laser saturation spectroscopy.