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Sep
15
awarded  Teacher
Sep
14
answered Jumping sewer lid - WHY?
Sep
14
comment Stimulated emission and coherence
Daniel, yes, I am quite familiar with quantum mechanics and the Dirac notation. Also, thanks for the link! That's a really great introduction to the Second quantization!
Sep
14
awarded  Supporter
Sep
13
asked Stimulated emission and coherence
Aug
19
comment Spontaneous emission in a system with multiple sublevels
Thank you for the reply! This is however not the case of magnetic dipole transitions. The transition between the two levels g and e is electric dipole transition (for example, e and g can be fine structure levels of an atom). I have updated the post to avoid further confusion.
Aug
19
revised Spontaneous emission in a system with multiple sublevels
Clarified, that here the transition $g-e$ is electric dipole transition.
Aug
19
asked Spontaneous emission in a system with multiple sublevels
Jan
11
revised Alkali atom in oscilating electromagnetic field
short answer added
Jan
11
awarded  Scholar
Jan
11
accepted Alkali atom in oscilating electromagnetic field
Jan
11
comment Alkali atom in oscilating electromagnetic field
Thank you for the nice explanation! The rotating wave approximation (when applicable) indeed helps to get rid of the counter-rotating terms. Having looked into books that deal with linearly polarized almost-resonant light, I didn't expect to find counter-rotating terms as separate matrix elements, and this eventually led me to the faulty assumption that these terms should not appear in the Hamiltonian at all.
Jan
10
awarded  Editor
Jan
10
revised Alkali atom in oscilating electromagnetic field
added 220 characters in body
Jan
10
comment Alkali atom in oscilating electromagnetic field
Thank you for your input, Emilio! I am quite convinced that I am calculating 3j symbols correctly. Values of reduced matrix elements $\langle \eta^\prime\parallel d\parallel\eta\rangle$ should be real. Initial matrix elements would be real only if the corresponding electric dipole operator matrix elements were real, which I believe is not the case. The Wigner-Eckart theorem tells us that for $\Delta m=\pm 1$ transition the only nonzero component of $\hat{\mathbf{d}}$ is for either $q=+1$ or $-1$. And this corresponds to complex $x,y$ components in the Cartesian basis.
Jan
8
awarded  Student
Jan
8
asked Alkali atom in oscilating electromagnetic field