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Dear all,
I have a question about one of the values presented in a paper, which is crucial in calculating energy transfer probability between two Yb3+ ions.
This is the paper:
T. Kushida, "Energy Transfer and Cooperative Optical Transitions in Rare-Earth Doped Inorganic Materials. I. Transition Probability Calculation", J. Phys. Soc. Jpn. 1973, 34, 1318-1326. DOI: http://dx.doi.org/10.1143/JPSJ.34.1318
The summary of this paper is that it uses similar approach to Judd-Ofelt theory (spherical harmonics with Coulomb interaction operator and extensive use of reduced matrix elements) to derive equations for dipole-dipole, dipole-quadrupole, quadrupole-quadrupole interactions. For the calculation of the actual values of these rates, one needs reduced matrix elements of the electronic transition.
In line 27 and 36-37 of page 1323, the author presents the reduced matrix element values for 2F5/2→2F7/2 transition of Yb3+ ions, namely <f13 2F5/2||U(2)||f13 2F7/2> = 6/49, <f13 2F5/2||U(4)||f13 2F7/2> = 20/49, and <f13 2F5/2||U(6)||f13 2F7/2> = 6/7. However, there is no reference to where these values came from. If it is a theoretical value, it still wouldn't make sense because Judd-Ofelt calculations for Yb3+ is impossible considering that it only has one excited state level (Judd-Ofelt analysis requires several to make sense).
How do you get these parameters?
Actually, there is another paper by O.L. Malta:
O. L. Malta, "Mechanisms of non-radiative energy transfer involving lanthanide ions revisited", J. non-Cryst. Solids 2008, 354, 4770-4776. DOI: http://dx.doi.org/10.1016/j.jnoncrysol.2008.04.023
In page 4775, there is a calculation of energy transfer rate, but also provides no values they used for the calculation. They provide ΣΩk<f13 2F5/2||U(k)||f13 2F7/2>, but that is only enough to calculate dipole-dipole, and every other multipole calculation requires reduced matrix element of each tensor rank.
Am I missing something in the theoretical or experimental aspect?
Thank you,
HAYAO
I have a question about one of the values presented in a paper, which is crucial in calculating energy transfer probability between two Yb3+ ions.
This is the paper:
T. Kushida, "Energy Transfer and Cooperative Optical Transitions in Rare-Earth Doped Inorganic Materials. I. Transition Probability Calculation", J. Phys. Soc. Jpn. 1973, 34, 1318-1326. DOI: http://dx.doi.org/10.1143/JPSJ.34.1318
The summary of this paper is that it uses similar approach to Judd-Ofelt theory (spherical harmonics with Coulomb interaction operator and extensive use of reduced matrix elements) to derive equations for dipole-dipole, dipole-quadrupole, quadrupole-quadrupole interactions. For the calculation of the actual values of these rates, one needs reduced matrix elements of the electronic transition.
In line 27 and 36-37 of page 1323, the author presents the reduced matrix element values for 2F5/2→2F7/2 transition of Yb3+ ions, namely <f13 2F5/2||U(2)||f13 2F7/2> = 6/49, <f13 2F5/2||U(4)||f13 2F7/2> = 20/49, and <f13 2F5/2||U(6)||f13 2F7/2> = 6/7. However, there is no reference to where these values came from. If it is a theoretical value, it still wouldn't make sense because Judd-Ofelt calculations for Yb3+ is impossible considering that it only has one excited state level (Judd-Ofelt analysis requires several to make sense).
How do you get these parameters?
Actually, there is another paper by O.L. Malta:
O. L. Malta, "Mechanisms of non-radiative energy transfer involving lanthanide ions revisited", J. non-Cryst. Solids 2008, 354, 4770-4776. DOI: http://dx.doi.org/10.1016/j.jnoncrysol.2008.04.023
In page 4775, there is a calculation of energy transfer rate, but also provides no values they used for the calculation. They provide ΣΩk<f13 2F5/2||U(k)||f13 2F7/2>, but that is only enough to calculate dipole-dipole, and every other multipole calculation requires reduced matrix element of each tensor rank.
Am I missing something in the theoretical or experimental aspect?
Thank you,
HAYAO