Timeline for Can a photon's angular momentum couple to an electron spin, to cause a spin-flip (thus allowing intersystem crossings)?
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| Oct 2, 2020 at 16:51 | comment | added | tomtom1-4 | Obviously, but the electric-dipole transition is by far the most dominant of those transitions. A prominent example of spin-flip transitions is the 21-centimeter line, though it does not have anything to do with singlet and triplet states, as it only involves one electron. The transition is so unlikely, that it can be observed mainly in outer space in regions with low density and low temperature. | |
| Oct 1, 2020 at 12:18 | comment | added | Emilio Pisanty | This is correct in the electric-dipole approximation -- but light-matter interaction includes a much wider hierarchy of interaction operators. | |
| Oct 1, 2020 at 10:58 | history | answered | tomtom1-4 | CC BY-SA 4.0 |