Ho, YK.
2008.
Atomic resonances involving positrons. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:516-521., Number 3
AbstractThe 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.
Kar, S, Ho YK.
2008.
Dipole polarizabilities of plasma-embedded Ps− and H− ions. Physics Letters A. 372:4253-4256., Number 23
AbstractWe 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.
Kar, S, Ho YK.
2008.
Dispersion coefficients for interactions between positronium and light atoms with pure Coulomb and screened Coulomb potentials. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:526-529., Number 3
AbstractThe 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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