Results 241 to 250 of about 3,381,508 (304)

Quadrupole Phase Transitions in Magnetic Solids

Physical Review Letters, 1971
We have studied the phase transitions of magnetic systems with large biquadratic interactions in the molecular-field approximation. Quadrupole and dipole phase transitions occur at different temperatures whenever the biquadratic interactions are greater than the bilinear terms for effective spin interactions with $\mathcal{S}g~\frac{3}{2}$.
H. H. Chen, Peter M. Levy
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Hysteresis-like phase transitions in quadrupole traps

Modern Physics Letters A, 2022
In this paper, we consider the Coulomb crystals in linear ion trap with a nonlinear dissipative force induced by optical radiation. We discuss a relation between 2D and 3D ion crystals formation and the crystalline units’ initial conditions. A phase diagram of the Coulomb crystal configurations is constructed.
Semyon Rudyi, Anna Romanova, Yuri Rozhdestvensky, Vadim Rybin   +3 more
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Double transitions in deuterium quadrupole resonance

Journal of Magnetic Resonance (1969), 1978
Abstract The new double nuclear resonance techniques enable the detection of the nuclear quadrupole resonance of the deuteron with very high sensitivity in powdered solids. One consequence is that it is possible to detect double transition quadrupole resonance (DTQR) in which two adjacent deuterons make simultaneous transitions absorbing a single ...
D.T Edmonds, A.A.L White
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Collision-induced dipole transitions and collisional broadening of quadrupole transitions

Physical Review A, 1981
Collision-induced dipole transitions and collisional broadening in the wing of $\mathrm{Cs}(5D)$ due to mixing with $\mathrm{Cs}(7S)$ and $\mathrm{Cs}(6P)$ are studied using two-photon resonance ionization spectroscopy. From the structure of the line shape, we measured the van der Waals well of the ground state without performing a temperature study or
Munir H. Nayfeh, W. Glab, A. McCown
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A new electric quadrupole transition in O16

Physics Letters, 1962
Strong enhancement of single-nucleon matrix elements for E2 transitions in nuclei neighboring O/sup 16/ result from the virtual excitation of a collective 2/sup +/ state in the O/sup 16/ core (S. Fallieros and R. A. Ferrell, Phys. Rev., 116: 660 (1959)).
G.R. Bishop, D.B. Isabelle
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Magnetic quadrupole transitions in optical radiation

Journal of Quantitative Spectroscopy and Radiative Transfer, 1965
Abstract The rates of two mechanisms for intercombination transitions in light atoms are compared for visible and near-ultraviolet light, following a suggestion of Mizushima. Even for small Z, spin-orbit electric dipole radiation dominates over magnetic quadropole radiation in determining the radiative lifetime, although in a sense these processes ...
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Quadrupole transitions at very small momentum transfer in nuclei

Physical Review C, 1988
The giant quadrupole resonance and the low-lying quadrupole transition have been investigated in /sup 58/Ni, /sup 92/Mo, /sup 120,124/Sn, /sup 140/Ce, and /sup 208/Pb by inelastic scattering of 108.5 MeV /sup 3/He particles at very small angles. Anomalous rise of the giant quadrupole resonance cross section is observed to 0/sup 0/.
Buenerd, M., Bouhelal, K., Martin, P., Chauvin, J., Lebrun, D., Perrin, G., de Saintignon, P., Duhamel, G.   +7 more
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Electric quadrupole transitions in neutral Li

Journal of Quantitative Spectroscopy and Radiative Transfer, 1975
Abstract Eigenfunctions of an effective potential for the valence electron in neutral Li are used to compute electric quadrupole oscillator strengths and transition probabilities for a large number of bound-bound transitions and a few bound-free transitions.
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Metamagnetic transition based on the quadrupole moment in PrCu2

Physica B: Condensed Matter, 1996
Abstract The metamagnetic transition of PrCu 2 brings about the crystal distortion based on the magnetoelastic effect. We have studied in detail this transition through the magnetostriction, magnetoresistance and magnetization measurements.
R Settai, P Ahmet, M Abliz, K Sugiyama, Y Ōnuki, K Kindo, S Takayanagi   +6 more
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Master equation for electric quadrupole transitions

Journal of Physics B: Atomic, Molecular and Optical Physics, 1989
A master equation is developed, analogous to the Lehmberg-Agarwal equation, for the study of electric quadrupole transitions in atomic systems. This equation allows one to study the evolution in time of a system of atoms interacting with and via the radiation field in terms of the average values of atomic operators only.
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