arc.alkali_atom_functions.AlkaliAtom.getTransitionRate#
- AlkaliAtom.getTransitionRate(n1, l1, j1, n2, l2, j2, temperature=0.0, s=0.5)[source]#
Transition rate due to coupling to vacuum modes (black body included)
Calculates transition rate from the first given state to the second given state \(|n_1,l_1,j_1\rangle \rightarrow |n_2,j_2,j_2\rangle\) at given temperature due to interaction with the vacuum field. For zero temperature this returns Einstein A coefficient. For details of calculation see Ref. 1 and Ref. 2. See Black-body induced population transfer example snippet.
- Parameters
n1 (int) – principal quantum number
l1 (int) – orbital angular momentum
j1 (float) – total angular momentum
n2 (int) – principal quantum number
l2 (int) – orbital angular momentum
j2 (float) – total angular momentum
[temperature] (float) – temperature in K
s (float) – optional, total spin angular momentum of state. By default 0.5 for Alkali atoms.
- Returns
transition rate in s \({}^{-1}\) (SI)
- Return type
References
- 1
C. E. Theodosiou, PRA 30, 2881 (1984) https://doi.org/10.1103/PhysRevA.30.2881
- 2
I. I. Beterov, I. I. Ryabtsev, D. B. Tretyakov, and V. M. Entin, PRA 79, 052504 (2009) https://doi.org/10.1103/PhysRevA.79.052504