Zobrazeno 1 - 10
of 117
pro vyhledávání: '"Brian G. Wybourne"'
Autor:
Brian G. Wybourne
Publikováno v:
International Journal of Quantum Chemistry. 7:35-43
The difficulties associated with the application of group theory to problems in physics and chemistry, and current attempts to overcome them, are reviewed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::905ada35366c6e11ca4bce7621e3d0a3
https://doi.org/10.1002/qua.560070706
https://doi.org/10.1002/qua.560070706
Autor:
Andrzej Kȩdziorski, Brian G. Wybourne
Publikováno v:
Journal of Alloys and Compounds. 451:18-34
Following Wybourne’s concept of the so-called intensity borrowing mechanism contributions that are due to the magnetic dipole transitions are described. The approach is based on double perturbation theory, within which the perturbative effect of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f217f01c1dbb0dbd46852083e6fb160
https://doi.org/10.1016/j.jallcom.2007.04.070
https://doi.org/10.1016/j.jallcom.2007.04.070
Publikováno v:
Collection of Czechoslovak Chemical Communications. 70:905-922
A theoretical model of magnetic dipole transitions in crystals doped by the lanthanide ions is based on the fourth-order perturbation theory applied for the Hamiltonian in which two perturbing mechanisms are taken into account. Namely, the impact due
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a44c511dfec496fbabe11c5c8beadca6
https://doi.org/10.1135/cccc20050905
https://doi.org/10.1135/cccc20050905
Publikováno v:
Journal of Alloys and Compounds. 380:151-155
The relativistic crystal field theory in case of the rare earth ion doped materials is presented. In order to calculate the values of crystal field splittings the effectively relativistic crystal field operators are applied. The matrix elements of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a6c8baed35cc1455e998f978ae19856
https://doi.org/10.1016/j.jallcom.2004.03.018
https://doi.org/10.1016/j.jallcom.2004.03.018
Autor:
Brian G. Wybourne
Publikováno v:
Journal of Alloys and Compounds. 380:96-100
The rare earths have long been a subject of fascination to chemists and physicists. Herein, I comment on some of the prehistory leading up to the advent of the Judd–Ofelt theory of the intensities of their remarkable spectra, the origins of the Jud
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0dab824ae6187c320c499c1bd972deee
https://doi.org/10.1016/j.jallcom.2004.03.034
https://doi.org/10.1016/j.jallcom.2004.03.034
Publikováno v:
Molecular Physics. 102:1105-1111
The magnetic dipole transitions in rare earth ions in crystals are described in terms of a model based on the fourth order perturbation theory. An analysis of the perturbing influence of crystal field potential and spin-orbit interaction is made. In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77e164e766f48f9a405b7945e84f141a
https://doi.org/10.1080/00268970410001728834
https://doi.org/10.1080/00268970410001728834
Publikováno v:
Journal of Alloys and Compounds. 341:67-70
The theory of energy transfer in rare earth-doped materials is developed in relativistic language that is formulated within the concept of L − S coupled states. The approach is defined by means of Sandars and Beck’s transformation of inter-shell
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::598473ecae9e50362b6af18f35fced5b
https://doi.org/10.1016/s0925-8388(02)00064-6
https://doi.org/10.1016/s0925-8388(02)00064-6
Autor:
Lidia Smentek, Brian G. Wybourne
Publikováno v:
Journal of Alloys and Compounds. 341:71-75
The Judd–Ofelt theory of f↔f transitions was originally developed as a non-relativistic theory nearly 40 years ago. Modifications to include the effects of spin–orbit effects have been developed by various researchers. The inclusion of relativi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d262f5e58849363ee18a38a6c53ab4c5
https://doi.org/10.1016/s0925-8388(02)00066-x
https://doi.org/10.1016/s0925-8388(02)00066-x
Autor:
Ronald C. King, Brian G. Wybourne
Publikováno v:
Journal of Physics A: Mathematical and General. 35:3489-3513
For each of the exceptional Lie groups, a complete determination is given of those pairs of finite-dimensional irreducible representations whose tensor products (or squares) may be resolved into irreducible representations that are multiplicity free,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66d7d1c74fe1d145c52af51ca40c6269
https://doi.org/10.1088/0305-4470/35/15/310
https://doi.org/10.1088/0305-4470/35/15/310
Autor:
Brian G. Wybourne
Publikováno v:
International Journal of Quantum Chemistry. 90:1249-1252
The symmetry properties of bosons and fermions in a one-dimensional harmonic oscillator are explored. It is shown that there is a one-to-one correspondence between the counts of the maximal spin states states formed by N-noninteracting bosons and fer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::847295e7e4ce26fbf3791c7dd371f875
https://doi.org/10.1002/qua.10224
https://doi.org/10.1002/qua.10224