2-PARTICLE STATES IN DENSE HYDROGEN PLASMAS WITH EXTERNAL ELECTRIC-FIELDS

Atomic bound state energies are drastically changed by many-particle e ffects such as dynamical self-energy, dynamical screening and Pauli bl ocking (phase space occupation). The continuum edge is changed, too, s o that the effective ionization energy may tend to zero with increasin g density and bound states do not exist (Mott effect). Another possibi lity to influence the energy spectrum is the application of external e lectrical fields (Stark effect). Both the many-particle effects and th e external field lead to a level broadening, i.e., to finite lifetimes of the two-particle states. In this paper, an effective Schrodinger e quation is solved which takes into account both influences on the two- particle spectrum and wave functions. Real and imaginary parts of the spectrum are determined using the complex scaling method. The interrel ation between external fields and many-particle effects is investigate d. The work is of interest for kinetic properties of plasmas with ioni zation and recombination processes, where there is a competition of th e influences mentioned.