The role of Chern Simons theory in solving the fractional quantum
... • A new class of fermions: Previous particles were bound states of elementary particles (quarks and leptons). A composite fermion is the bound state of an electron and quantum mechanical phases (quantized vortices). • Collective particle: Even a single composite fermion is an enormously complicated, ...
... • A new class of fermions: Previous particles were bound states of elementary particles (quarks and leptons). A composite fermion is the bound state of an electron and quantum mechanical phases (quantized vortices). • Collective particle: Even a single composite fermion is an enormously complicated, ...
NOBLE-GAS CHEMISTRY
... an unexpected warming It is now known that noble-gas atoms do not bind exclusively to nonmetals, but they may also form bonds to metals (see Fig. 4). This was realized, however, only in 1983 despite the many preceding inorganic and organometallic syntheses performed in a liquid or supercritical xeno ...
... an unexpected warming It is now known that noble-gas atoms do not bind exclusively to nonmetals, but they may also form bonds to metals (see Fig. 4). This was realized, however, only in 1983 despite the many preceding inorganic and organometallic syntheses performed in a liquid or supercritical xeno ...
1. The Dirac Equation
... then, may be significant for sufficiently heavy nuclei. Though hydrogenic ions with very heavy nuclei may not be of great practical interest, this relationship will have implications for heavy many-electron atoms where the innermost electrons experience a large portion of the full nuclear charge and ...
... then, may be significant for sufficiently heavy nuclei. Though hydrogenic ions with very heavy nuclei may not be of great practical interest, this relationship will have implications for heavy many-electron atoms where the innermost electrons experience a large portion of the full nuclear charge and ...
Modern Methods in Drug Discovery
... The problem of ab initio calculation is their N4 dependence from the number of two-electron integrals. These arise from the number of basis functions and the interactions between electrons on different atoms. In semiempirical methods the numerical effort is strongly reduced by assumptions and approa ...
... The problem of ab initio calculation is their N4 dependence from the number of two-electron integrals. These arise from the number of basis functions and the interactions between electrons on different atoms. In semiempirical methods the numerical effort is strongly reduced by assumptions and approa ...
Experimental - AIP FTP Server
... the differences between the model calculations and the experimental results. It is found that the agreement between the quantum mechanical statistical model predictions and the experimentally observed total kinetic energy release spectra for the H atom dissociation channel can be greatly improved if ...
... the differences between the model calculations and the experimental results. It is found that the agreement between the quantum mechanical statistical model predictions and the experimentally observed total kinetic energy release spectra for the H atom dissociation channel can be greatly improved if ...
Isolated-core excitations in strong electric fields. I. Theory F. Robicheaux
... series. However, it has not yet been possible to perform detailed comparisons between experimental and calculated recombination cross sections for individual resonances in a static electric field; this is because the resolution in electron scattering experiments is not high enough to resolve the Ryd ...
... series. However, it has not yet been possible to perform detailed comparisons between experimental and calculated recombination cross sections for individual resonances in a static electric field; this is because the resolution in electron scattering experiments is not high enough to resolve the Ryd ...
Theory of x-ray absorption by laser-dressed atoms
... Certain aspects of the theory of x-ray absorption by laser-dressed atoms were analyzed in Refs. 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17. Freund [6] treats the simultaneous absorption of one laser photon and one x-ray photon by solids. The absorption of x rays by laser-dressed hydrogen is examined ...
... Certain aspects of the theory of x-ray absorption by laser-dressed atoms were analyzed in Refs. 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17. Freund [6] treats the simultaneous absorption of one laser photon and one x-ray photon by solids. The absorption of x rays by laser-dressed hydrogen is examined ...
THE CONCEPTUAL BASIS OF QUANTUM FIELD THEORY
... particles is tremendously weak. As long as we disregard that, the theory is perfect. And, as I will explain, its internal logic is not shaky at all. Subatomic particles all live in the domain of physics where spins and actions are comparable to Planck’s constant h̄. One obviously needs Quantum Mecha ...
... particles is tremendously weak. As long as we disregard that, the theory is perfect. And, as I will explain, its internal logic is not shaky at all. Subatomic particles all live in the domain of physics where spins and actions are comparable to Planck’s constant h̄. One obviously needs Quantum Mecha ...
Exploring Compton Scattering Using the Spectrum
... Although the origin of spectral features in the gamma spectrum of a pure radioisotope is a common source of confusion among beginner physics students, its explanation is simple and touches on one of the most important ideas about the nature of light. This experiment directly demonstrates the transfe ...
... Although the origin of spectral features in the gamma spectrum of a pure radioisotope is a common source of confusion among beginner physics students, its explanation is simple and touches on one of the most important ideas about the nature of light. This experiment directly demonstrates the transfe ...
Electromagnetic cascade in high energy electron, positron, and
... high energy dissipation and associated processes. The individual processes of a photon emission by an electron and a photon decay into an electron-positron pair in strong constant crossed field show an enhancement in the production of high energy particles. However, in the interaction with the laser ...
... high energy dissipation and associated processes. The individual processes of a photon emission by an electron and a photon decay into an electron-positron pair in strong constant crossed field show an enhancement in the production of high energy particles. However, in the interaction with the laser ...
Concept Questions
... due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the torques about that point is zero. The friction force will always be ...
... due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the torques about that point is zero. The friction force will always be ...
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... possible Phase II, whereas other topics listed will be completed during Phase I. • Future simulations will consider both a ground shield for protection against lunar surface dust and photoemission electrons, as well as an outer electron shield to deflect incoming electron radiation from space. It ma ...
... possible Phase II, whereas other topics listed will be completed during Phase I. • Future simulations will consider both a ground shield for protection against lunar surface dust and photoemission electrons, as well as an outer electron shield to deflect incoming electron radiation from space. It ma ...
Possibility of single-atom detection on a chip
... photon before its decay. 共Provided the reflectivity of the mirrors is close to 1, the finesse of the cavity is just 4 n rt .) This agrees with the naive expectation that the effect of the atom should depend on the fraction of the light within its cross section and should increase linearly with the ...
... photon before its decay. 共Provided the reflectivity of the mirrors is close to 1, the finesse of the cavity is just 4 n rt .) This agrees with the naive expectation that the effect of the atom should depend on the fraction of the light within its cross section and should increase linearly with the ...
Coherence and Raman Sideband Cooling of a Single Atom in an Optical Tweezer
... 6:5 K kB is similar to the result of the Doppler measurement above. Several properties of the cooled atom are worth noting. The heating rate for the radial degrees of freedom is very low, less than n < 0:3 over 200 ms. Also, we observe no heating while translating the atom over distances 20 m ...
... 6:5 K kB is similar to the result of the Doppler measurement above. Several properties of the cooled atom are worth noting. The heating rate for the radial degrees of freedom is very low, less than n < 0:3 over 200 ms. Also, we observe no heating while translating the atom over distances 20 m ...
Atomic theory
In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.