FBIAS_R0

FBIAS_R0 = [real (array)] 

Description: Defines the half-step position ($\xi_{0\mu}$) for the Fermi-like step-shaped bias potential of the following form:

$\tilde{V}(\xi_1,\dots,\xi_{M_4}) = \sum_{\mu=1}^{M_4}\frac{A_{\mu}}{1+\text{exp}\left [-D_{\mu}(\frac{\xi(q)}{\xi_{0\mu}} -1) \right ]}, \;$

where the sum runs over all ($M_4$) coordinates the potential acts upon, which are defined in the ICONST file by setting the status to 4. The units of $\xi_{0\mu}$ correspond to units of the coordinate the potential acts upon (e.g., ${\AA}$ for coordinates with flag R, $rad.$ for coordinates with flag A, dimensionless for coordinates with flag W, etc...). The number of items defined via FBIAS_R0 must be equal to $M_4$, otherwise the calculation terminates with an error message.

Related tags and articles

FBIAS_A, FBIAS_D, ICONST, Biased molecular dynamics