This perturbation is responsible for the frequency of the 21-centimeter line because it produces a triplet and a singlet state in the ground state of hydrogen.
This perturbation is responsible for the frequency of the 21-centimeter line because it produces a triplet and a singlet state in the ground state of hydrogen. Arising from the magnetic dipoles of both the orbital electron and nucleic proton, it is the result of spin-spin coupling. FTP, what is this energy perturbation that is about ten to the negative fourth times smaller than that of the fine splitting?
This perturbation is responsible for the frequency of the 21-centimeter line because it produces a triplet and a singlet state in the ground state of hydrogen.
Hyperfine splitting