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Computational P hysics

Computational P hysics

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Computational P hysics

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  1. Computational Physics Computer Simulations in Physics

  2. Computational physics • Computational physics is the study and implementation of numerical algorithms to solve problems in Physics for which a quantitative theory already exists. • Computational physicsis the intermediate branch between theoretical and experimental physics

  3. Quantitative Theory + +Experiment Conception ++Computer = =Numerical Experiment==Computer Experiment==Computational Experiment

  4. Applications of computational physics Computation now represents an essential component of modern research in: • accelerator physics • Astrophysics • fluid mechanics • lattice field theory/lattice gauge theory (especially lattice quantum chromodynamics), • plasma physics (see plasma modeling) • solid state physics

  5. Molecular Dynamics Simulations F = ma miai = Fi1 + Fi2 + Fi3 + … + FiN, where i = 1, 2, …, N; N>100

  6. Ion Formation from Charged Nanodropletsin Electrospray Ionization

  7. Simulate the solvatochromism ofbetaine-30 in BMIM[PF6] • Solvatochromism is the ability of a chemical substance to change color due to a change in solvent polarity. A water molecule, a commonly-used example of polarity. The two charges are present with a negative charge in the middle (red shade), and a positive charge at the ends (blue shade).

  8. betaine-30

  9. Time-Dependence ofThe Spectral Shift

  10. Direction between positions of ion center in basic and excited state

  11. Electrical Field

  12. Znamenskiy, V. S.; Green, M. E. Topological Changes of Hydrogen Bonding of Water with Acetic Acid: AIM and NBO Studies. J. Phys. Chem. A.; 2004; 108(31); 6543-6553.

  13. Quantum Calculations on Hydrogen Bonds in Certain Water Clusters Show Cooperative Effects

  14. E(D) =C1D +C2D2 2