qspec.sigma_v  (  m ,  t  )[source]

The standard deviation of a normal distribution of particle velocities in thermal equilibrium $$ \sigma_v = \sqrt{\frac{k_\mathrm{B}T}{m}}. $$

Parameters:

marray_like

The mass $m$ of the particle (u).

tarray_like

The temperature $T$ of the environment (K).

Returns:

outndarray

The standard deviation $\sigma_v$ (m/s).