• The dependence of scattering length on van derWaals interaction and reduced mass of the system in two-atomic collision at cold energies

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      The static exchange model (SEM) and the modified static exchange model (MSEM) recently introduced by Ray in {\it Pramana – J. Phys.} 83, 907 (2014) are used to study the elastic collision between two hydrogen-like atoms when both are in ground states by considering the system as a four-body Coulomb system in the centre of mass frame, in which all the Coulomb interaction terms in direct and exchange channels are treated exactly. The SEM includes the non-adiabatic short-range effect due to electron exchange. The MSEM added init, the long-range effect due to induced dynamic dipole polarizabilities between the atoms e.g., the van der Waals interaction. Applying the SEM code in different H-like two-atomic systems, a reduced mass $(\mu)$ dependence on the scattering length is observed. Again, applying the MSEM code on H(1s)–H(1s) elastic scattering and varying the minimum values of interatomic distance $R_0$, the dependence of scattering length on the effective interatomic potential consistent with the existing physics is observed. Both these basic findings in low and cold energy atomic collision physics are quite useful and are being reported for the first time.

    • Author Affiliations


      RAY HASI1 2 3 4

      1. Study Centre, S-1/407/6, B.P. Township, Kolkata 700 094, India
      2. Department of Physics, New Alipore College, New Alipore, Kolkata 700 053, India
      3. Department of Science, NITTTR-K, Salt Lake, Kolkata 700 106, India
      4. Code 671, Heliophysics Division, GSFC, NASA, Greenbelt, Maryland 20771, USA
    • Dates

  • Pramana – Journal of Physics | News

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