Results 271 to 280 of about 10,751 (304)
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Eliminating cold-collision frequency shifts
Physical Review A, 1995A technique to cancel the frequency shift due to cold collisions of laser-cooled atoms is proposed. Results for future clocks based on $^{135}\mathrm{Cs}$ and $^{137}\mathrm{Cs}$ are presented. We find a $^{137}\mathrm{Cs}$ fountain clock can be operated with no cold-collision shift by adjusting the population ratios in the fountain, and it may also be
, Gibble, , Verhaar
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Reaction and Scattering in Cold Electron Collisions
Physical Review Letters, 2003Experimental data are presented for the scattering of electrons by CCl4 between 8 and 200 meV impact energy. These results are used in conjunction with data for the reactive process, yielding Cl-, to study the low energy behavior of a system which simultaneously displays both reactive and elastic scattering channels.
J P, Ziesel +3 more
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1999
Laser-cooling techniques were developed in the early 1980s for a variety of reasons, such as high-resolution spectroscopy. During the development of the techniques to cool and trap atoms, it became apparent that collisions between cold atoms in optical traps was one of the limiting factors in the achievement of high density samples.
Harold J. Metcalf, Peter van der Straten
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Laser-cooling techniques were developed in the early 1980s for a variety of reasons, such as high-resolution spectroscopy. During the development of the techniques to cool and trap atoms, it became apparent that collisions between cold atoms in optical traps was one of the limiting factors in the achievement of high density samples.
Harold J. Metcalf, Peter van der Straten
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Physics World, 2001
For many years atomic-collision experiments basically involved measuring the deflection of fast projectiles that had passed through gaseous targets, or measuring the amount of light given off by atoms and molecules as they were bombarded with different projectiles. In recent years, however, the atomic-physics community has aspired to much more: we want
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For many years atomic-collision experiments basically involved measuring the deflection of fast projectiles that had passed through gaseous targets, or measuring the amount of light given off by atoms and molecules as they were bombarded with different projectiles. In recent years, however, the atomic-physics community has aspired to much more: we want
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Adiabatic theory for anisotropic cold molecule collisions
Journal of Chemical Physics, 2015We developed an adiabatic theory for cold anisotropic collisions between slow atoms and cold molecules. It enables us to investigate the importance of the couplings between the projection states of the rotational motion of the atom about the molecular axis of the diatom. We tested our theory using the recent results from the Penning ionization reaction
Mariusz Pawlak +2 more
exaly +3 more sources
Cold State-Selected Molecular Collisions and Reactions
Annual Review of Physical Chemistry, 2014Over the past decade, and particularly the past five years, a quiet revolution has been building at the border between atomic physics and experimental quantum chemistry. The rapid development of techniques for producing cold and even ultracold molecules without a perturbing rare-gas cluster shell is now enabling the study of chemical reactions and ...
Benjamin K, Stuhl +2 more
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Feshbach resonances in cold collisions of potassium atoms
Physical Review A, 2002In this paper we briefly review the basic steps that allow the calculation of the scattering length in the collision of two alkali-metal atoms in a well defined magnetic polarization state, and in the presence of a static magnetic field. Calculations are actually done for the low-field seeking state F = 1, \mu F = 1 of bosonic potassium atoms.
Bambini A. 1, Geltman S. 2
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Time Delays and Cold Collisons
2005A brief description is given of how low energy electron beam scattering experiments may be conducted in the energy range down to a few meV. Experimental data demonstrating virtual state scattering in CO2are shown. Expressions are given for the time delays (or lifetimes) of low energy electron molecule encounters and these expressions are used to give ...
Field, David +2 more
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Quantum suppression of cold atom collisions
Physical Review A, 1996, Côté, , Heller, , Dalgarno
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