Relativistic resonances in combined magnetic and laser fields

We propose a mechanism for experimental investigation of relativistic effec ts in the laser-atom interaction with moderate (nonrelativistic) laser inte nsities that involves placing the system in a static magnetic field paralle l to the laser's magnetic-field component. The resonantly included relativi stic motion of the atomic electron leads to a variety of novel phenomena: a relativistic dephasing leading to a ringlike spatial probability density, a counterintuitive window of relativistically enhanced. motion, and a seque nce of sawtooth-shaped resonances that may increase the harmonic generation .