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    • Two atoms scattering at low and cold energies

      Hasi Ray

      Research Articles Volume 83 Issue 6 December 2014 pp 907-914

    • Fulltext

       

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      https://www.ias.ac.in/article/fulltext/pram/083/06/0907-0914

    • Keywords

       

      Coulomb interaction; elastic scattering; interatomic potential; dipole–dipole; long range; scattering length; four-centre; ab-initio.

    • Abstract

       

      A modified static-exchange model is developed to study the collision of an atom with another atom. It includes the effect of long-range dipole–dipole van der Waals interaction between two atoms in addition to the exact effect of short-range force due to Coulomb exchange between two system electrons. Both these interactions dominate at colder energies. The system is treated as a four-centre problem in the centre-of-mass frame. The present ab-initio model is useful to study the two-atomic collisions at low energies, as well as cold energies. The new code is applied to study the scattering of positronium (Ps) by hydrogen (H), both in their ground states.

    • Author Affiliations

       

      Hasi Ray1 2 3

      1. National Institute of Technical Teachers’ Training and Research Kolkata, Salt Lake City, Kolkata 700 106, India
      2. New Alipore College, New Alipore, Kolkata 700 053, India
      3. Study Centre, S-1/407/6, B. P. Township, Kolkata 700 032, India

    • Dates

       
      Published
      December 2014
      Manuscript received
      27 June 2013
      Manuscript revised
      5 March 2014
      Accepted
      13 March 2014
      Early published
      14 September 2014

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