Zobrazeno 1 - 10
of 117
pro vyhledávání: '"W.T. Carnall"'
Publikováno v:
The Journal of Chemical Physics. 101:8277-8289
We report a systematic analysis of the crystal‐field spectra of four fluoride compounds containing tetravalent actinide ions. The first part of this work [J. Chem. Phys. 95, 7194 (1991)] provided interpretation of the absorption spectra of UF4, NpF
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ef6d42bd09260e1b9a67fbe5c67d0a0
https://doi.org/10.1063/1.468093
https://doi.org/10.1063/1.468093
Publikováno v:
Journal of the Less Common Metals. 169:1-8
[N(CH3)4]2BkCl6 was synthesized from cold, concentrated HCl(aq) using 249Bk ( t 1 2 = 320 days ) separated from 249Cf on the milligram scale. For comparison [N(CH3)4]2ZrCl6 was also synthesized and single crystals were grown. Both compounds were stud
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e5e7d2b117cd45bd6254128de6d0366
https://doi.org/10.1016/0022-5088(91)90229-w
https://doi.org/10.1016/0022-5088(91)90229-w
Publikováno v:
The Journal of Chemical Physics. 90:3443-3457
The optical spectra of the lanthanides doped into single crystal LaF3 have been interpreted in terms of transitions within 4f N configurations. Energy matrices combining free‐ion terms with a crystal field for an approximate model which assumes C2v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67d5a57ab1ad9b7d4856adbb395f85b9
https://doi.org/10.1063/1.455853
https://doi.org/10.1063/1.455853
Publikováno v:
Journal of the Less Common Metals. 126:283-289
Previous successful analyses of the observed crystal-field structure in Tm3+:LaF3 and Ho3+:LaF3 in an approximate C2v site symmetry have depended on a crystal-field model derived in an analysis of the spectrum of Er3+:LaF3. In the present investigati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ac49dd59acdfdf1918020288c3b2942
https://doi.org/10.1016/0022-5088(86)90294-8
https://doi.org/10.1016/0022-5088(86)90294-8
Autor:
W.T. Carnall
Publikováno v:
Journal of the Less Common Metals. 156:221-235
A crystal field analysis of the energy level structure deduced in LaCl3: Am3+ and in the isostructural compound AmCl3 from spectroscopic measurements has been carried out using an effective operator Hamiltonian. Both free-ion and crystal field parame
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::73a818761d8b024daf4af7e7df38873a
https://doi.org/10.1016/0022-5088(89)90421-9
https://doi.org/10.1016/0022-5088(89)90421-9
Autor:
W.T. Carnall, J. C. Hindman, R. Kugel, John G. Malm, M. Fred, L. S. Goodman, C.W. Williams, W. J. Childs
Publikováno v:
The Journal of Chemical Physics. 65:3486-3492
The first evidence for an isotope shift in the near infrared region of the spectrum of an actinide molecule, PuF6, is reported. Using samples of 239PuF6 and 242PuF6, isotope shifts were found in the absorption region near 8000 A. Shifts of 0.3 to 1.2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d9af509d8049430188b10195424d03a
https://doi.org/10.1063/1.433575
https://doi.org/10.1063/1.433575
Autor:
W.T. Carnall, H. Crosswhite
Publikováno v:
Journal of the Less Common Metals. 93:127-135
The results of model crystal field calculations in C 2 v symmetry for Pr 3+ -LaF 3 and Tm 3+ -LaF 3 are compared with experimental data for the nearly complete f 2 (f 12 ) configurations. It is shown that the method used results in computed levels th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5bac62e308b009151ee2d573ff4cde7
https://doi.org/10.1016/0022-5088(83)90457-5
https://doi.org/10.1016/0022-5088(83)90457-5
Publikováno v:
Journal of the Less Common Metals. 126:271-276
The electronic transition intensities of the LiYF4Eu3+ matrix are explained by mainly two mechanisms: the induced electric dipole and the magnetic dipole mechanism. The induced electric dipole transition intensities are simulated by means of a set of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6643fcf9fa1bc08ef4917eafc34c8345
https://doi.org/10.1016/0022-5088(86)90292-4
https://doi.org/10.1016/0022-5088(86)90292-4
Publikováno v:
Journal of the Less Common Metals. 115:79-89
The optical absorption spectra of polycrystalline samples of both α- and β-UF5 have been measured in the range 2700 - 500 nm at 4, 77 and about 293 K using a recording spectrophotometer. It was assumed that the crystal field in both cases was domin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc72ffbb6f35fe8067175a87d996e654
https://doi.org/10.1016/0022-5088(86)90373-5
https://doi.org/10.1016/0022-5088(86)90373-5
Publikováno v:
Journal of the Less Common Metals. 148:201-205
An unsolved problem in actinide spectroscopy is the lack of a consistent systematic interpretation of tetravalent actinide ion spectra. We are addressing this problem by modelling the spectra of AnF4 and An4+:CeF4. This family exhibits a single cryst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71aa20f27480d4d57a5fb88a3d3fc728
https://doi.org/10.1016/0022-5088(89)90028-3
https://doi.org/10.1016/0022-5088(89)90028-3