qspec.p_el  (  u ,  q ,  m ,  p0 = 0 ,  relativistic = True  )[source]

The momentum $p = \frac{1}{c}\sqrt{(qU)^2 + (p_0 c)^2 + 2qU\sqrt{(p_0 c)^2 + (mc^2)^2}}$.

Parameters:

uarray_like

The electric potential difference $U$ added to the kinetic energy of a body with momentum p0 (V).

qarray_like

The electric charge $q$ of the body (e).

marray_like

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

p0array_like

The initial momentum of the body (u m/s).

relativisticbool

The calculation is performed either relativistically (True) or classically (False). The default is True.

Returns:

outndarray

The momentum $p$ of a body with electric charge q, mass m and starting momentum p0 after the addition of the energy e (u m/s).