Molecular Mechanics Molecular Dynamics A Classical Mechanics A
- Slides: 21
• • Molecular Mechanics Molecular Dynamics
• A Classical Mechanics • A I. Classical mechanics and molecules • A II. Molecular mechanics (MM) and molecular dynamics (MD) A III. Alternative formulations of Newton’s laws, Lagrange equations, Hamiltonan •
Isaaca Newton (1642 -1727) F V Molecules: Central Importance of Energy
Boltzmann distribution Partition function
Energy derivatives … molecular properties
Energy in MD Lennard Jones Potential
QB Charles-Augustin de Coulomb RAB 1785 Coulomb (electrostatic) forces QA
(Covalent) bond
Bond Angle
Torsion (dihedral) angle
Out of plane wagging
MD Molecular Energy
“Anharmonic terms” “cross/mixed terms”
(MM) Minimization
(MM) Minimization -Closest minimum to initial geometry - cannot overcome barriers
MD • Motion: whole energy landscape (potential energy surface)
MD
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