ESTOP

ESTOP = [real] 

Default: ESTOP

= 0.05

Description: ESTOP specifies the stop condition for stochastic MP2.

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ESTOP defines the energy accuracy in units of eV for each individual tau-point of the two individual MP2 energy contributions (direct MP2 term + exchange MP2 term). Since the statistical errors of each contribution is independent, the standard deviation of the MP2 energy can be estimated as

$\sigma ={\texttt {ESTOP}}*{\sqrt {2\cdot {\texttt {NOMEGA}}}}\;.$

According to our experience, the error of the resulting MP2 energy can then be safely estimated by $\pm 2\sigma$.

Thus, if you require an MP2 energy with a maximum error of $\Delta$, you should set

${\texttt {ESTOP}}={\frac {\Delta }{2\cdot {\sqrt {2\cdot {\texttt {NOMEGA}}}}}}\;.$

See this tutorial for more Information about Laplace transformed MP2.

Related Tags and Sections

ALGO, LMP2LT, LSMP2LT, NOMEGA, NSTORB

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