Results 11 to 20 of about 1,141 (209)
Operation of a Stark decelerator with optimum acceptance [PDF]
Physical Review A, 2009 With a Stark decelerator, beams of neutral polar molecules can be accelerated, guided at a constant velocity, or decelerated. The effectiveness of this process is determined by the 6D volume in phase space from which molecules are accepted by the Stark decelerator.
Scharfenberg, L. +4 more
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New Journal of Physics, 2009 A microstructured array of 1254 electrodes on a substrate has been configured to generate an array of local minima of electric field strength with a periodicity of 120 $μ$m about 25 $μ$m above the substrate. By applying sinusoidally varying potentials to the electrodes, these minima can be made to move smoothly along the array.
Meek, S., Conrad, H., Meijer, G.
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Nonadiabatic transitions in a Stark decelerator [PDF]
Physical Review A, 2010 In a Stark decelerator, polar molecules are slowed down and focussed by an inhomogeneous electric field which switches between two configurations. For the decelerator to work, it is essential that the molecules follow the changing electric field adiabatically. When the decelerator switches from one configuration to the other, the electric field changes
Wall, TE +3 more
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A detailed account of the measurements of cold collisions in a molecular synchrotron
EPJ Techniques and Instrumentation, 2018 We have recently demonstrated a general and sensitive method to study low energy collisions that exploits the unique properties of a molecular synchrotron (Van der Poel et al., Phys Rev Lett 120:033402, 2018).
Aernout P. P. van der Poel +1 more
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Optimizing the density of Stark decelerated radicals at low final velocities: a tutorial review
EPJ Techniques and Instrumentation, 2017 The Stark deceleration technique can produce molecular beams with very low velocities. In order to maximize the density of decelerated molecules, experimental parameters such as the velocity, the velocity spread and the spatial spread of the initial ...
Dominik Haas +3 more
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Analytic wave model of Stark deceleration dynamics [PDF]
Physical Review A, 2006 Stark deceleration relies on time-dependent inhomogeneous electric fields which repetitively exert a decelerating force on polar molecules. Fourier analysis reveals that such fields, generated by an array of field stages, consist of a superposition of partial waves with well-defined phase velocities.
Gubbels, K. +3 more
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Preparation of Translationally Cold Neutral Molecules
CHIMIA, 2011 Efforts at EPFL to obtain translationally cold neutral molecules are described. Active deceleration of polar molecules is performed by confining the molecules in moving three-dimensional electrostatic traps, and by appropriately choosing the ...
Giulia Di Domenicantonio +2 more
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Experiments with Stark decelerated and trapped OH radicals [PDF]
Physica Scripta, 2007 In this paper, we review recent developments in our efforts to get complete control over the velocity of a molecular beam. Central to these experiments is the use of a Stark decelerator, with which the velocity of a beam of neutral polar molecules can be continuously varied, using techniques akin to methods used in charged particle accelerator physics.
van de Meerakker, S.Y.T. +2 more
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Can We Observe the Gravitational Quantum States of Positronium?
Advances in High Energy Physics, 2015 We consider the feasibility of observing the gravitational quantum states of positronium. The proposed scheme employs the flow-throw technique used for the first observation of this effect with neutrons.
P. Crivelli +2 more
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Microwave Stark decelerator for polar molecules [PDF]
Physical Review A, 2005 We propose a method to decelerate polar molecules from a beam using a microwave field. A moving standing wave of a microwave electric field causes an ac Stark shift to polar molecules and decelerates them. The method is applicable to polar molecules in rotational ground states and can be used to directly load a microwave trap. Numerical simulations are
Enomoto, K, Momose, T
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