Theoretical Atomic Collisions Laboratory

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We have made a first investigation on the resonances in two electron systems in various model plasma environments. The 2s2 1Se autoionization resonance state in the helium atom is determined by calculating the density of resonance states using the stabilization method. A screened Coulomb potential obtained from the Debye model is used to represent the interaction between the charged particles. A correlated wave function has been used to represent the correlation effect between the three charge particles. The calculated resonance energies and widths for various Debye parameters ranging from infinity to a small value along with the ground state energies are reported.

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The effect of Debye plasmas on the dispersion coefficient \{C6\} for interactions among H and He atoms has been investigated for the first time using highly correlated exponential basis functions. The \{C6\} coefficient for the interactions among H and He are reported for various Debye lengths.

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