Search Results - "Hessels, E A"

A measurement of the atomic hydrogen Lamb shift and the proton charge radius by Bezginov, N, Valdez, T, Horbatsch, M, Marsman, A, Vutha, A C, Hessels, E A

“…The surprising discrepancy between results from different methods for measuring the proton charge radius is referred to as the proton radius puzzle. In…”
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Ultrahigh-Precision Measurement of the n=2 Triplet P Fine Structure of Atomic Helium Using Frequency-Offset Separated Oscillatory Fields by Kato, K, Skinner, T D G, Hessels, E A

“…For decades, improved theory and experiment of the n=2 ^{3}P fine structure of helium have allowed for increasingly precise tests of quantum electrodynamics,…”
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Oriented Polar Molecules in a Solid Inert-Gas Matrix: A Proposed Method for Measuring the Electric Dipole Moment of the Electron by Vutha, A., Horbatsch, M., Hessels, E.

“…We propose a very sensitive method for measuring the electric dipole moment of the electron using polar molecules embedded in a cryogenic solid matrix of…”
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First laser-controlled antihydrogen production by STORRY, C. H, SPECK, A, HERRMANN, M, WALZ, J, HÄNSCH, T. W, COMEAU, D, HESSELS, E. A, LE SAGE, D, GUISE, N, GABRIELSE, G, GRZONKA, D, OELERT, W, SCHEPERS, G, SEFZICK, T, PITTNER, H

“…Lasers are used for the first time to control the production of antihydrogen (H ). Sequential, resonant charge exchange collisions are involved in a method…”
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Background-free observation of cold antihydrogen with field-ionization analysis of its states by Gabrielse, G, Bowden, N S, Oxley, P, Speck, A, Storry, C H, Tan, J N, Wessels, M, Grzonka, D, Oelert, W, Schepers, G, Sefzick, T, Walz, J, Pittner, H, Hänsch, T W, Hessels, E A

“…A background-free observation of cold antihydrogen atoms is made using field ionization followed by antiproton storage, a detection method that provides the…”
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First measurement of the velocity of slow antihydrogen atoms by GABRIELSE, G, SPECK, A, WALZ, J, HÄNSCH, T. W, COMEAU, D, HESSELS, E. A, STORRY, C. H, LESAGE, D, GUISE, N, GRZONKA, D, OELERT, W, SCHEPERS, G, SEFZICK, T, PITTNER, H

“…The speed of antihydrogen atoms is deduced from the fraction that passes through an oscillating electric field without ionizing. The weakly bound atoms used…”
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Precision Measurement of the n=2 Triplet P J=1 to J=0 Fine Structure of Atomic Helium Using Frequency-Offset Separated Oscillatory Fields by Heydarizadmotlagh, F, Skinner, T D G, Kato, K, George, M C, Hessels, E A

“…Increasing accuracy of the theory and experiment of the n=2 ^{3}P fine structure of helium has allowed for increasingly precise tests of quantum…”
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Calculation of the local environment of a barium monofluoride molecule in a neon matrix by Lambo, R. L., Koyanagi, G. K., Horbatsch, M., Fournier, R., Hessels, E. A.

“…The local environment of a barium monofluoride (BaF) molecule embedded in a neon matrix is studied theoretically. The energy of the BaF-Ne triatomic system is…”
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Trapped antihydrogen in its ground state by Gabrielse, G, Kalra, R, Kolthammer, W S, McConnell, R, Richerme, P, Grzonka, D, Oelert, W, Sefzick, T, Zielinski, M, Fitzakerley, D W, George, M C, Hessels, E A, Storry, C H, Weel, M, Müllers, A, Walz, J

“…Antihydrogen atoms (H¯) are confined in an Ioffe trap for 15-1000 s-long enough to ensure that they reach their ground state. Though reproducibility challenges…”
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Driven Production of Cold Antihydrogen and the First Measured Distribution of Antihydrogen States by Gabrielse, G., Bowden, N. S., Oxley, P., Speck, A., Storry, C. H., Tan, J. N., Wessels, M., Grzonka, D., Oelert, W., Schepers, G., Sefzick, T., Walz, J., Pittner, H., Hänsch, T. W., Hessels, E. A.

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One-particle measurement of the antiproton magnetic moment by DiSciacca, J, Marshall, M, Marable, K, Gabrielse, G, Ettenauer, S, Tardiff, E, Kalra, R, Fitzakerley, D W, George, M C, Hessels, E A, Storry, C H, Weel, M, Grzonka, D, Oelert, W, Sefzick, T

“…For the first time a single trapped antiproton (p) is used to measure the p magnetic moment μ(p). The moment μ(p)=μ(p)S/(ℏ/2) is given in terms of its spin S…”
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Laser-controlled production of Rydberg positronium via charge exchange collisions by Speck, A., Storry, C.H., Hessels, E.A., Gabrielse, G.

“…Lasers are used to choose the binding energies of highly excited positronium atoms (Ps*) created via charge exchange collisions. The lasers directly excite…”
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Density and geometry of single component plasmas by Speck, A., Gabrielse, G., Larochelle, P., Le Sage, D., Levitt, B., Kolthammer, W.S., McConnell, R., Wrubel, J., Grzonka, D., Oelert, W., Sefzick, T., Zhang, Z., Comeau, D., George, M.C., Hessels, E.A., Storry, C.H., Weel, M., Walz, J.

“…The density and geometry of p¯ and e+ plasmas in realistic trapping potentials are required to understand and optimize antihydrogen (H¯) formation. An aperture…”
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Stacking of cold antiprotons by Gabrielse, G, Bowden, N.S, Oxley, P, Speck, A, Storry, C.H, Tan, J.N, Wessels, M, Grzonka, D, Oelert, W, Schepers, G, Sefzick, T, Walz, J, Pittner, H, Hänsch, T.W, Hessels, E.A

“…The stacking of cold antiprotons is currently the only way to accumulate the large numbers of the cold antiprotons that are needed for low energy experiments…”
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Adiabatic cooling of antiprotons by Gabrielse, G, Kolthammer, W S, McConnell, R, Richerme, P, Kalra, R, Novitski, E, Grzonka, D, Oelert, W, Sefzick, T, Zielinski, M, Fitzakerley, D, George, M C, Hessels, E A, Storry, C H, Weel, M, Müllers, A, Walz, J

“…Adiabatic cooling is shown to be a simple and effective method to cool many charged particles in a trap to very low temperatures. Up to 3×10(6) p are cooled to…”
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Antihydrogen production within a Penning-Ioffe trap by Gabrielse, G, Larochelle, P, Le Sage, D, Levitt, B, Kolthammer, W S, McConnell, R, Richerme, P, Wrubel, J, Speck, A, George, M C, Grzonka, D, Oelert, W, Sefzick, T, Zhang, Z, Carew, A, Comeau, D, Hessels, E A, Storry, C H, Weel, M, Walz, J

“…Slow antihydrogen (H) is produced within a Penning trap that is located within a quadrupole Ioffe trap, the latter intended to ultimately confine extremely…”
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Gabrielse et al. Reply by Gabrielse, G., Bowden, N. S., Oxley, P., Speck, A., Storry, C. H., Tan, J. N., Wessels, M., Grzonka, D., Oelert, W., Schepers, G., Sefzick, T., Walz, J., Pittner, H., Hänsch, T. W., Hessels, E. A.

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Shifts from a distant neighboring resonance by Horbatsch, M., Hessels, E. A.

“…The line center of a resonance is affected by the presence of neighboring resonances due to quantum interference between the two resonant processes. Such…”
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Driven production of cold antihydrogen and the first measured distribution of antihydrogen states by Gabrielse, G, Bowden, N S, Oxley, P, Speck, A, Storry, C H, Tan, J N, Wessels, M, Grzonka, D, Oelert, W, Schepers, G, Sefzick, T, Walz, J, Pittner, H, Hänsch, T W, Hessels, E A

“…Cold antihydrogen is produced when antiprotons are repeatedly driven into collisions with cold positrons within a nested Penning trap. Efficient antihydrogen…”
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Deflection of barium monofluoride molecules using the bichromatic force: A density-matrix simulation by Marsman, A, Horbatsch, M, Hessels, E. A

“…A full density-matrix simulation is performed for optical deflection of a barium monofluoride ($^{138}$Ba$^{19}$F) beam using the bichromatic force, which…”
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