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The modified static exchange model (MSEM) recently introduced by Ray [1] tostudy two-atomic collision processes at low and cold-energies, is used fordetailed analysis of the long-range effects due to induced dipole-dipole vander Waals interaction between Ps and H atoms. The MSEM includes thenon-adiabatic short-range effect due to electron-exchange and the long-rangeeffect due to induced dynamic dipole polarisabilities of the atoms. Theeffective interatomic potential is highly sensitive to the minimum distancebetween the atoms ( ). The s-, p- and d- wave elastic phase shifts,corresponding partial cross sections, the scattering length and effectiveranges are calculated and studied with the variation of the chosen leastinteratomic distance between them. It is found that the scattering length ishighly sensitive to the effective interatomic potential that depends on theleast interatomic distance. In addition the studies are made in search ofFeshbach resonances. The observed interesting feature with the variation of inthe triplet channel invites more accurate investigations if new physics.

The Effect of van der Waals interaction in Elastic Collision between Ps(1s) and H(1s)