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\section{First Question}
I think your answer with regard to the probability distribution of potential energy is correct. There is indeed an expression
in term of ensemble average for this probability distribution, which is given below.

For a system with N particles, the potential energy is , so the configuration partition function is

,

where . So for an ensemble average of function is given by



Then the  probability distribution of potential energy P(U) can be written as



For most systems, there is no analytical way  of calculating P(U), but one could just sample P(U) in simulations,
which can be done very easily. In general the P(U) obtained from sampling is not perfectly Gaussian, but one could fit
it to Gaussian.

\section{Second Question}
From the figure you showed, one could see that the mean value of potential energy increases as temperature increases.
Also, the width of the potential energy distribution (i.e. fluctuations) also increases as temperature increases. This is a natural
result from thermodynamics and statistical mechanics. First, the derivative of mean potential energy with respect to temperature
is just the heat capacity (here it means the non-ideal part of the heat capacity).



Apparently the heat capacity is greater than zero (because of the convexity of free energy function), so the mean potential
energy increases with temperature.

On the other hand, one could easily find the relation between fluctuation of energy (the width of potential energy distribution)
and temperature in a standard stat mech  textbook.



So the fluctuation increases as temperature increases.

So, to answer your question, I would say that in canonical (NVT) ensemble, molecules would always prefer configurations
that minimizes free energy. Since free energy comprises parts both from energy and entropy, molecules have to choose
configurations that find a balance between energy and entropy (i.e. minimize energy but also maximize entropy).

\section{Last Question}
The last question is much easier to answer. Suppose to get sufficient statistics, you need to sample at least 100 ps in
the region of stable configuration. However, since you're using REMD, you spend 50 ps of your 100 ps exploring other
parts of the phase space, then you have to spend more time totally in order to obtain as good statistics as your previous
simulations for your stable configuration.
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\section{First Question}
I think your answer with regard to the probability distribution of potential energy is correct. There is indeed an expressi ...

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