qspec.f_0  (  i ,  j_l ,  f_l ,  j_u ,  f_u ,  theta_l ,  as_sympy = False  )[source]

The $f$ function, parameterizing the classical part of the perturbative differential scattering rate, as described in [R. C. Brown et al., Phys. Rev. A 87, 032504 (2013)].

Parameters:

isympy_quant

The nuclear spin quantum number $I$.

j_lsympy_quant

The electronic total angular momentum quantum number $J_l$ of the lower state.

f_lsympy_quant

The total angular momentum quantum number $F_l$ of the lower state.

j_usympy_quant

The electronic total angular momentum quantum number $J_u$ of the upper state.

f_usympy_quant

The total angular momentum quantum number $F_u$ of the upper state.

theta_lsympy_like

The angle $\theta_\mathrm{L}$ between the electric field of the linearly polarized incoming photon and the direction of detection.

as_sympybool

Return the result as a symbol (True) or as a float (False).

Returns:

fsympy_core | float

The value of the $f$ function.