Perturbation theory for the ground singlet state of the Heisenberg spin 1/2 antiferromagnetic chain

1998 ◽  
Vol 88 (2) ◽  
pp. 116-129
Author(s):  
I. V. Abarenkov
Keyword(s):  
Perturbation Theory ◽  
Singlet State ◽  
Heisenberg Spin ◽  
Ground Singlet State

scholarly journals Entanglement Perturbation Theory for Antiferromagnetic Heisenberg Spin Chains

2012 ◽  
Vol 81 (11) ◽  
pp. 114712 ◽  
Author(s):  
Lihua Wang ◽  
Sung Gong Chung
Keyword(s):  
Perturbation Theory ◽  
Spin Chains ◽  
Heisenberg Spin ◽  
Heisenberg Spin Chains

Small-dilution perturbation theory for quasi-low-dimensional Heisenberg spin systems atT=0

1978 ◽  
Vol 17 (5) ◽  
pp. 2316-2323 ◽  
Author(s):  
Arthur R. McGurn ◽  
Raza A. Tahir-Kheli
Keyword(s):  
Perturbation Theory ◽  
Spin Systems ◽  
Heisenberg Spin ◽  
Low Dimensional

Low-lying activated states of chloroiridium phthalocyanine aggregates in glassy solution at low temperatures

1988 ◽  
Vol 66 (1) ◽  
pp. 86-92 ◽  
Author(s):  
W.-H. Chen ◽  
K. E. Rieckhoff ◽  
E.-M. Voigt
Keyword(s):  
Singlet State ◽  
Torsional Oscillation ◽  
Zero Point ◽  
Triplet States ◽  
Excited Singlet ◽  
Glassy Solution ◽  
Ground Singlet State ◽  
Modes Of Vibration ◽  
State Formula ◽  
Singlet And Triplet States

Studies of phosphorescence intensities and lifetimes of two chloroiridium phthalocyanine aggregates in α-chloronaphthalene between 5 and 80 K have revealed the existence of low-lying activated states only a few tens of cm−1 above the zero-point vibration in both lowest singlet and triplet states. From the data, activation energies of intersystem crossings between the two multiplicities associated with these states have been obtained as follows: for crossing from the first excited singlet to the lowest triplet state, Ea = 42 ± 10 and 29 ± 10 cm−1, respectively, for the two aggregates; for crossing from the lowest triplet to the ground singlet state, [Formula: see text] and 23 ± 5 cm−1, respectively. These activated states are tentatively attributed to certain intermolecular modes of vibration in aggregates. Specifically, they fit the model of molecular torsional oscillation of two and three parallel-sheet arrangements. On the basis of these findings, we propose that the first Ea (or [Formula: see text]) is the fundamental librational frequency of the dimer and the second Ea (or [Formula: see text]) is that for the trimer.

A full dimensional potential for H2O2 (X1A) covering all dissociation channels

2017 ◽  
Vol 19 (2) ◽  
pp. 1378-1388 ◽  
Author(s):  
Daniela V. Coelho ◽  
João Brandão
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Singlet State ◽  
Ground Singlet State

A full dimensional potential energy surface for the H2O2 ground singlet state including all the dissociation channels.

Synthesis, molecular and electronic structure of a stacked half-sandwich dititanium complex incorporating a cyclic π-faced bridging ligand

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 94149-94159
Author(s):  
Róbert Gyepes ◽  
Jiří Pinkas ◽  
Ivana Císařová ◽  
Jiří Kubišta ◽  
Michal Horáček ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Singlet State ◽  
Bridging Ligand ◽  
Ground Singlet State ◽  
Half Sandwich ◽  
Molecular And Electronic Structure

The thermally robust ground singlet state complex [bis(η5-pentamethylcyclopentadienyltitanium)-μ-(η4:η4-1,2,4,5-tetrakis(trimethylsilyl)cyclohexa-1-4-diene-3,6-diyl)] (3) arises from thermolysis of Cp*TiMe3.

scholarly journals Флуктуирующая флуоресценция одиночных центров окраски в кристаллах фторида лития

2022 ◽  
Vol 130 (1) ◽  
pp. 138
Author(s):  
В.П. Дресвянский ◽  
С.А. Зилов ◽  
Е.Ф. Мартынович
Keyword(s):  
Fluorescence Microscopy ◽  
Triplet State ◽  
Fluorescence Intensity ◽  
Room Temperature ◽  
Singlet State ◽  
Rotational Diffusion ◽  
Translational Diffusion ◽  
Color Centers ◽  
Confocal Fluorescence ◽  
Ground Singlet State

Single F2 and F3+- color centers in the LiF crystal were studied by confocal fluorescence microscopy. The time dependences of their fluorescence intensity were analyzed and statistically processed. Our studies show that, the F3+- color center, being photoexcited, is able enter the triplet state, while in ground (singlet) state it changes orientation with a frequency of 1.5 – 2 Hz at room temperature, due to reorientational diffusion, unlike the F2- center, which is reoriented only being in the triplet state. This subtype of rotational diffusion of the center does not lead to its translational diffusion.

EFFECTIVE SPINON-SPINON AND HOLON-HOLON INTERACTIONS IN RVB MODELS OF HIGH-Tc SUPERCONDUCTIVITY

1989 ◽  
Vol 03 (03) ◽  
pp. 415-425
Author(s):  
NGUYEN VAN HIEU
Keyword(s):  
Perturbation Theory ◽  
Singlet State ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Hubbard Hamiltonian ◽  
Effective Attraction ◽  
Effective Hamiltonians ◽  
Extended Hubbard Hamiltonian

The interaction between the bosonic excitations as well as between the fermionic ones in the RVB systems with the (extended) Hubbard Hamiltonian were studied by means of the slave boson technique and the perturbation theory. The corresponding effective Hamiltonians have been found. It was shown, in particular, that in the RVB system with two interpenetrating sublattices there exists the effective attraction between two holons of different kinds as well as between two spinions of different kinds in the singlet state.

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

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