Angular splitting in half Kapitza-Dirac effect of H-2(+) molecules

摘要

The half Kapitza-Dirac effect following photoionization of molecules in intense standing-wave laser fields is studied. Photoelectron angular distributions (PADs) of molecules split towards the laser propagation and exhibit multiple splitting, which manifests the integer property of the ponderomotive parameter, as the laser intensity increases. The PADs are asymmetric about the laser polarization plane and vary with the molecular alignment as well as the kinetic energy of photoelectrons.