1. The problem statement, all variables and given/known data Hi I have a question - it is not homework, but something I have thought about for a long time. I really can't come up with a solution to the problem, and it is driving me crazy. Here is the problem: Say I have a linearly polarized monochromatic wave incident on an atom. The k-vector and the E-vector of the light form a right angle. Now say I apply a magnetic field, but such that it is perpendicular to both k and E. My problem is that I don't know what transition will be driven in the atom. The B-field defines the quantization axis. But somehow I need to decompose the E-field such that it points along B. What is the strategy for doing this? I would be very happy to get some feedback/hints. Best, Niles.