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Modified Shepard interpolation method applied to trapping mediated adsorption dynamics.

P N Abufager1, C Crespos, H F Busnengo

  • 1Instituto de Física Rosario, IFIR, (CONICET-UNR) and Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Av. Pellegrini 250, 2000 Rosario, Argentina.

Physical Chemistry Chemical Physics : PCCP
|May 10, 2007
PubMed
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The modified Shepard (MS) method accurately models H(2)/Pd(111) adsorption dynamics, including complex trapping mechanisms. This confirms MS as a valuable tool for studying low-energy molecular adsorption.

Area of Science:

  • Surface Science
  • Computational Chemistry
  • Chemical Physics

Background:

  • Dissociative adsorption of molecules on surfaces is crucial in catalysis and materials science.
  • Understanding adsorption mechanisms, including direct and indirect pathways (dynamic trapping), is essential.
  • Accurate potential energy surfaces (PES) are vital for simulating adsorption dynamics.

Purpose of the Study:

  • To evaluate the performance of the modified Shepard (MS) interpolation method for adsorption dynamics.
  • To investigate the H(2)/Pd(111) system, known to exhibit both direct and dynamic trapping adsorption mechanisms.
  • To compare MS-based calculations with results from a highly accurate, pre-existing PES.

Main Methods:

  • Utilized the modified Shepard (MS) interpolation method.

Related Experiment Videos

  • Employed classical trajectory calculations.
  • Input data derived from a corrugation reducing procedure (CRP) interpolated potential energy surface (PES).

    • Main Results:

    • Dissociation probabilities calculated using the MS-PES closely matched those from the CRP-PES.
    • The MS method effectively captured adsorption dynamics, including indirect trapping mechanisms.
    • High agreement was observed between MS-PES and CRP-PES results.

    Conclusions:

    • The modified Shepard (MS) method is a reliable and promising tool for simulating low-energy adsorption dynamics.
    • MS method accurately models systems with complex adsorption mechanisms like dynamic trapping.
    • Confirms the utility of MS interpolation for polyatomic molecule adsorption studies.