Photoionization microscopy of hydrogen in magnetic and quadrupolar electric fields

摘要

The photoionization microscopy of hydrogen in magnetic and quadrupolar electric fields is studied on the basis of the semiclassical theory. Potential for the studied system possesses saddle points lying in the rho-direction, rather than the z-direction in the common case, such as atom in the electric field. We find the electron current recorded by cylindrical surface detector shows symmetric interference patterns along z-direction, and predict that the interference pattern presents the list structure, instead of the cyclic structure observed in the electric field. Besides, the interference structures are assigned to different types of trajectories. As the scaled energy increases, the structure of the interference pattern evolves smoothly and more types of trajectories emerge.