Why the magnetic dipole transition are more allowed when the Eu3+ ions are at site having inversion symmetry? How the symmetry of crystal decides the certain transitions to occur and others to forbidden?
Specifically, in case of monazite type monoclinic LaVO4: Eu3+ system, magnetic dipole transitions of Eu3+ ions are more allowed compare to their zircon type tetragonal counterpart even though the structure of former is more asymmetric.
it's difficult to answer this question in a few sentences. you can see the paper of Judd and Ofelt. in f-f transition, the electrical dipole radiation are forbidden transitions in atom physics by the parity theory and angular momentum theory in quantum. but, the magnetic dipole transition is allowed. in fact , rare earth emission mainly come from the electrical dipole radiation due to the crystal field. in inversion symmetry, the electrical dipole radiation is not allowed, only magnetic dipole transition is allowed.
Dear Chandresh Kumar Rastogi
you can this book:
W. T. Carnal!
Chemistry Division
Argonne National Laboratory
Read the article G. Blasse, A. Bril, Philips Techn. Rev. 31 (1970) 304–334.
I am very surprised to hear that intensity of magnetic dipole transitions are dependent on site symmetry of ions. I believe only ED transitions are environment sensitive.
However, it is still not clear that why the electric dipole transition are more allowed in tetragonal LaVO4 compare to monoclinic LaVO4 though the later being more disordered structure?
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