Theoretical Atomic Collisions Laboratory

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The effects of hot-dense plasmas on the bound states and the dipole polarizability of the ground state of Coulomb three-body molecular ion H+2 have been investigated using highly correlated basis functions and by considering the Debye shielding approach of plasma modeling. The ground S state and the first excited P state energies along with the dipole polarizability for different shielding parameters 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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The recent theoretical studies of atomic resonances involving positrons are reviewed. The topics under discussions are the doubly-excited states of the positronium negative ion and resonance scattering in e+–H, e+–He+, Ps–H, e+–He, e+–Li, e+–Na and e+–K.

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We have investigated the effect of weakly coupled hot plasmas on the dipole polarizabilities of positronium negative ion and hydrogen negative ion. The plasma effect is taken care of by employing a screened Coulomb (Yukawa) potential of Debye type, and highly correlated exponential wave functions are used. Dipole polarizabilities for various screening parameters are reported.

The Van der Waals two-body dispersion coefficients for interactions between the positronium (Ps) atom and light atoms have been investigated using highly correlated exponential basis functions in the framework of both pure Coulomb and screened Coulomb potentials. The C6, \{C8\} and \{C10\} coefficients for Ps–Ps and Ps–H interactions, and the \{C6\} coefficients for Ps–He interactions for both the screened and unscreened cases, are reported.

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