Results 271 to 280 of about 50,900 (313)
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1981
Until recently it was generally believed that all matter condenses as the temperature is reduced. With the exception of helium the condensed state is ultimately a solid. (Helium forms a liquid at 4.2 K, but resists solidification under its own vapor pressure down to absolute zero.) Now, however, it is known that one substance will remain gaseous at ...
Thomas J. Greytak +3 more
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Until recently it was generally believed that all matter condenses as the temperature is reduced. With the exception of helium the condensed state is ultimately a solid. (Helium forms a liquid at 4.2 K, but resists solidification under its own vapor pressure down to absolute zero.) Now, however, it is known that one substance will remain gaseous at ...
Thomas J. Greytak +3 more
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Spin States and Spin Polarization
2011Quantum mechanics deals with statistical statements about the result of measurements on an ensemble of states (particles, beams, targets). In other words: by giving an expectation value of operators it provides probabilitites (better: probability amplitudes) for the result of a measurement on an ensemble. Here two limiting cases can be distinguished.
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Reports on Progress in Physics, 1997
Dilute liquid - liquids offer a model system for testing theories of weakly interacting fermions. The ability to spin polarize the nuclei adds an extra dimension to the field. In this review, the extraordinary way in which the polarization of the nuclear spins can modify the macroscopic behaviour of the liquid is explained.
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Dilute liquid - liquids offer a model system for testing theories of weakly interacting fermions. The ability to spin polarize the nuclei adds an extra dimension to the field. In this review, the extraordinary way in which the polarization of the nuclear spins can modify the macroscopic behaviour of the liquid is explained.
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Physics Today, 1995
A new field that has come to be called “spin-polarized transport” is growing dramatically. Although its roots are in the quantum description of solids, only recently have new material fabrication techniques permitted widespread study of the phenomenon and the development of device applications (see figure 1).
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A new field that has come to be called “spin-polarized transport” is growing dramatically. Although its roots are in the quantum description of solids, only recently have new material fabrication techniques permitted widespread study of the phenomenon and the development of device applications (see figure 1).
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Physica Scripta, 1989
We briefly review the field of spin polarized fluids. The study of spin polarized hydrogen was initially motivated by the hope to observed a Bose–Einstein condensation in a dilute gas. This goal has not yet been reached but, on the way, a lot of beautiful physics has been done, including atom–wall interactions studies and the observation of nuclear ...
F Laloë, G Vermeulen
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We briefly review the field of spin polarized fluids. The study of spin polarized hydrogen was initially motivated by the hope to observed a Bose–Einstein condensation in a dilute gas. This goal has not yet been reached but, on the way, a lot of beautiful physics has been done, including atom–wall interactions studies and the observation of nuclear ...
F Laloë, G Vermeulen
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Physica B+C, 1984
Abstract In this paper a selection of the most important developments in low-temperature atomic hydrogen research is reviewed. We discuss the basic properties of the spin-polarized state (H↓) and the experimental techniques currently employed. We show that under appropriate conditions recombination proceeds seven orders of magnitude slower than at ...
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Abstract In this paper a selection of the most important developments in low-temperature atomic hydrogen research is reviewed. We discuss the basic properties of the spin-polarized state (H↓) and the experimental techniques currently employed. We show that under appropriate conditions recombination proceeds seven orders of magnitude slower than at ...
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1983
This communication is to be considered as an addendum to the reference (1). The purpose of that paper was to investigate, within the framework of geometric quantization a la Kostant — Souriau, the new notion of polarizer of a prequantizable symplectic manifold.
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This communication is to be considered as an addendum to the reference (1). The purpose of that paper was to investigate, within the framework of geometric quantization a la Kostant — Souriau, the new notion of polarizer of a prequantizable symplectic manifold.
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2006
The principles of angle-resolved photoemission spectroscopy (ARPES) with spin resolution are outlined, with the emphasis on conceptual clarity and not on completeness. In Sect. 2, the theoretical ingredients of the photoemission process are discussed, including the single-particle matrix element as well as the many-body reaction of the solid as ...
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The principles of angle-resolved photoemission spectroscopy (ARPES) with spin resolution are outlined, with the emphasis on conceptual clarity and not on completeness. In Sect. 2, the theoretical ingredients of the photoemission process are discussed, including the single-particle matrix element as well as the many-body reaction of the solid as ...
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Reports on Progress in Physics, 1971
The production and detection of electron polarization are discussed in the context of low-energy collision phenomena. After a short summary of the history of the subject, the formalism of Stokes parameters is reviewed. Physical processes are surveyed in the following sequence: elastic collisions with spin zero targets (Mott scattering); spin exchange ...
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The production and detection of electron polarization are discussed in the context of low-energy collision phenomena. After a short summary of the history of the subject, the formalism of Stokes parameters is reviewed. Physical processes are surveyed in the following sequence: elastic collisions with spin zero targets (Mott scattering); spin exchange ...
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2006
The effects of a strong nuclear polarization on the macroscopic properties of gaseous and liquid 3He at low temperatures are discussed. They are all pure consequences of the atom indistinguishability.
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The effects of a strong nuclear polarization on the macroscopic properties of gaseous and liquid 3He at low temperatures are discussed. They are all pure consequences of the atom indistinguishability.
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