Zobrazeno 1 - 10 of 27 pro vyhledávání: '"J. P. Colpa"'
1
Symmetry substructures for MQ-NMR of [A]20 spin clusters of dodecahedranes, [13CH]20 or [13CD]20, metallic M @M20 and [H2O]+ @[H2O]20 exo-cage cluster molecules and their higher-n SO(3) �l n spin algebras, within the context of mapping,l n -ITP algebras and number partitions
Autor: J. P. Colpa, F. P. Temme
Publikováno v: Zeitschrift f�r Physik D Atoms, Molecules and Clusters. 25:275-284
For both highern andI i ≧1 spin clusters, combinatorics provides powerful arguments with which to investigate the substructural forms of cluster spin algebras; this is especially so for SO(3) ×l n symmetries for 12≦n≦60 wherex (.) [λ] charact
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ef968213fefa80d0d0222ef6b9c57cf
https://doi.org/10.1007/bf01426891
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2
Demonstration of the origins of cooperativity within SU2�L 6 mapping over $$\left\{ {I\tilde H_\upsilon } \right\}$$ Liouvillian carrier subspaces characterising the MQ-NMR cluster [A]6(L 6) and its $$\{ |kq\upsilon :[\tilde \lambda ] > > \} $$ tensorial bases
Autor: J. P. Colpa, F. P. Temme
Publikováno v: Zeitschrift f�r Physik B Condensed Matter. 89:335-342
The fundamental mappings over carrier subspace and substructures associated with $$\{ |kq\upsilon > > \} $$ augmented spin algebras of Liouville space, and their mapping onto a subduced symmetry, are derived for [A]6(L 6) spin clusters within the com
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1d68ec45e5e708633f078a3fe3a37b63
https://doi.org/10.1007/bf01318165
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3
Spin symmetry and gel'fand patterns of higher SU2�? n groups
Autor: F. P. Temme, J. P. Colpa
Publikováno v: Zeitschrift f�r Physik D Atoms, Molecules and Clusters. 23:187-193
The nature ofl5 spin algebra is considered together withl5↓l5↓C4v mapping in order to specify the dual spin symmetry for MQ-NMR ofnido-11B5H9. The forms of Gel'fand shapes forl5 spin symmetry are presented to show how they specify thefull range o
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https://doi.org/10.1007/bf01436743
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4
Summary ofS n mapping properties of some lexicalp-tuples, or wordlengths, over (M 1-M 2) fields of Rota-Cayley algebra in generating Hilbert space SO(3) xS n irreps of higherI i identical spin clusters, [A] n (S n ), forn ? 7
Autor: F. P. Temme, J. P. Colpa
Publikováno v: Journal of Mathematical Chemistry. 11:341-352
Subdomain partitioning of n-fold fields associated withS n -scalar invariants of Rota-Cayley algebra and enumerative combinatorias are shown to provide direct access to the hierarchical substructure (inventory) of higher identical spin clusters. Such
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::379cbce0df03a962810e68d94c5977ac
https://doi.org/10.1007/bf01164213
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6
Aspects Of SU2 × ϕn Liouvillian Duality and SU2/SO(3) × (ϕ12 ↓ A5) Symmetry Over Spin (Spin-Isomorphic) Spaces Of MO-NMR and Ouantum-Rotational Tunnelling Problems
Autor: F. P. Temme, J. P. Colpa
Publikováno v: 25th Congress Ampere on Magnetic Resonance and Related Phenomena ISBN: 9783540531364
Multiple quantum NMR spin cluster problems are best understood in terms of their dual Liouvillian bases which for Ii=1/2 clusters may be realised over a simply-reducible carrier space H, spanning Hv subsets, of the irreducible representations of SU2
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f81f496472d460dfcc8907effcf446f
https://doi.org/10.1007/978-3-642-76072-3_328
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7
Vibrationally induced nuclear spin relaxation of quadrupolar nuclei
Autor: J. P. Colpa, R. J. C. Brown
Publikováno v: The Journal of Chemical Physics. 77:1501-1504
Nuclear spin relaxation times are calculated for quadrupolar nuclei situated at the center of octahedral and tetrahedral molecules. Vibrational distortion of such a molecule generates an electric field gradient at the center, which does not average t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3040c3f7645df9378fa29527b33c3852
https://doi.org/10.1063/1.443978
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8
The inequality formulation of Hund’s rule and a reinterpretation of singlet–triplet energy differences, generalized for molecules at equilibrium geometry
Autor: R. E. Brown, J. P. Colpa
Publikováno v: The Journal of Chemical Physics. 68:4248-4251
An inequality formulation in the open‐shell Hartree–Fock approximation for Hund’s multiplicity rule for atoms has been generalized for the energy differences between a singlet and a triplet state of a molecule with different geometries for the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc328a8974f2692284b3c6548b78d80e
https://doi.org/10.1063/1.436292
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9
Identification of the lowest energy nuclear fluctuation modes promoting the photochemical H‐transfer tunneling reaction in doped fluorene single crystals
Autor: J. P. Colpa, B. Prass, Dietmar Stehlik
Publikováno v: The Journal of Chemical Physics. 88:191-197
Data with improved accuracy are presented for the low temperature reaction rates k(T) of the H‐tunneling reaction between one specific host neighbor molecule in fluorene single crystals and a photoexcited acridine guest. The constant low temperatur
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https://doi.org/10.1063/1.454635
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10
Transannular interactions in [2.2] phanes as studied by luminescence and optical detection of magnetic resonance
Autor: Heinz A. Staab, Karl H. Hausser, Matthias Haenel, Dieter Schweitzer, J. P. Colpa
Publikováno v: Journal of Luminescence
Emission spectra of different types of [2.2] naphthalenophanes were measured at 1.25 K in glasses as well as in small single crystals. In addition, the D and E values of the excited triplet states were studied by optical detection of magnetic resonan
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40abf5eb767dcec66e4a5e260ac0e3b1
https://doi.org/10.1016/0022-2313(76)90107-1
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