# arc.calculations_atom_single.AtomSurfaceVdW.getStateC3#

AtomSurfaceVdW.getStateC3(n, l, j, coupledStatesList, s=0.5, debugOutput=False)[source]#

Van der Waals atom-surface interaction coefficient for a given state ($$C_3$$ in units of $$\mathrm{J}\cdot\mathrm{m}^3$$ )

Parameters
• n (int) – principal quantum number of the state

• l (int) – orbital angular momentum of the state

• j (int) – total angular momentum of state

• coupledStatesList (array) – array of states that are strongly dipole-coupled to the initial state, whose contribution to $$C_3$$ will be take into account. Format [[n1,l1,j1],…]

• s (float, optional) – total spin angular momentum for the considered state. Default value of 0.5 is correct for AlkaliAtoms, but it has to be explicitly specifiied for DivalentAtom.

• debugOutput (bool, optional) – prints additional output information, False by default.

Returns

$$C_3$$ (in units of $${\rm J}\cdot {\rm m}^3$$ ), estimated error $$\delta C_3$$

Return type