CPMD
Q1: Can CPMD generate Free energy surface? With MetaD or Umbrella sampling?
Q2: What is meaning of collective variables? fictitious mass? fictitious energy?
Is it a function of coordinate R (nuclear position)?
Q3: what is the meaning of 1/2(s_i(R)-s_i)^2? Is the deviation of original s_i?
Q4: V(t,s) potential = integration along trajectories.
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