Results 91 to 100 of about 4,639 (219)

Preparation and characterization of an acrylated‐coumarin‐containing photo‐crosslinked thiol‐ene network: Investigation of the free‐volume, thermal, UV, and photoluminescence properties

Polymer Engineering &Science, Volume 65, Issue 4, Page 1949-1960, April 2025.
Acrylated coumarin‐containing polymeric films were UV‐cured via a thiol‐ene click reaction. Free volume properties were analyzed using PALS both below and above Tg. A‐Coumarin additives reduced segmental mobility, lowering free volume fraction and raising Tg.
Fatmanur Uyumaz, Gamze Özgül Artuç, Gamze Pehlivan, Ayça Akdoğan, Uğur Yahşi, Cumali Tav, Mustafa Bulut, Memet Vezir Kahraman   +7 more
wiley   +1 more source

Laser Cooling Positronium with Broadband Laser Pulses

The first successful demonstration of broadband laser cooling of positronium (Ps) atoms, obtained within the AEgIS experiment at CERN, is presented here.
Rohne O. M., Pospisil S., Graczykowski L., Guatieri F., Doser M., Ferguson R., Castelli F., Hugenschmidt C., Lappo L., Zielinski J., Gloggler L. T., Petracek V., Rienacker B., Welsch C. P., Rauschendorfer T., Rangwala S. A., Tefelski D., Kasprowicz G., Grosbart M., Gusakova N., Mariazzi S., Pandey P., Consolati G., Prelz F., Povolo L., Ciurylo R., Sharma S., Berghold M., Rodin V., Penasa L., Chehaimi A., Eliaszuk K., Sandaker H., Klosowski L., Zawada M., Cerchiari G., Linek A., Khatri G., Burian P., Kornakov G., Sowinski T., Piwinski M., Rawat B. S., Zurlo N., Pecak D., Caravita R., Alfaro Campos S., Moskal P., Janik M. A., Vafeiadis T., Auzins M., Germann M., Munster M., Huck S., Volponi M., Bergmann B., Januszek T., Kempny K., Krumins V., Giszczak A., Brusa R. S., Camper A., Smolyanskiy P., Gustafsson F., Haider S.   +64 more
core   +1 more source

Anomalous magnetic moment of the positronium ion

New Journal of Physics, 2014
We determine the gyromagnetic factor of the positronium ion, a three-body system consisting of two electrons and a positron, including first relativistic corrections. We find that the g -factor is modified by a term $-0.51\left( 1 \right){{\alpha }^{2}}$
Yi Liang, Paul L McGrath, Andrzej Czarnecki   +2 more
doaj   +1 more source

Optically excited states in positronium [PDF]

, 1990
Optical excitation are reported of the 1 3S-2 3P transition in positronium, and a second excitation from n=2 to higher n states. The experiment used light from two pulsed dye lasers. Changes in the positronium annihilation rate during and after the laser
Magnotta, F., Failor, R. A., Dermer, Charles D., Ziock, Klaus P., Howell, R. H., Jones, K. M.   +5 more
core  

Positronium and quantum electrodynamics

, 1982
Experimental tests of quantum electrodynamics using positronium are reviewed. These tests include measurements of the ground state hyperfine structure, excited state fine structure, and the annihilation decay rates of positronium.
D. W. Gidley
core   +1 more source

Positronium ionisation in collision with He atoms [PDF]

, 2002
Positronium is the lightest known atom, consisting of an electron and its antiparticle the positron. Because of its light mass (comparable with that of the electron and positron, rather than conventional atoms), recoil effects are expected to play an ...
Armitage, Simon Peter
core   +1 more source

Positronium chemistry

, 1964
Positronium Chemistry focuses on the methodologies, reactions, processes, and transformations involved in positronium chemistry. The publication first offers information on positrons and positronium and experimental methods, including mesonic atoms ...
Lee, John C, Green, James
core  

Positron-Positronium Converters in Reflection and Transmission Geometry for Gravitational Experiments with Antihydrogen using Moiré Deflectometry

In the context of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) located at CERN, positron-positronium converters with a high positron-positronium conversion efficiency have been designed in both reflection and transmission ...
Rohne O. M., Pospisil S., Graczykowski L., Guatieri F., Doser M., Castelli F., Hugenschmidt C., Lappo L., Zielinski J., Gloggler L. T., Petracek V., Rienacker B., Welsch C. P., Rauschendorfer T., Rangwala S. A., Tefelski D., Kasprowicz G., Grosbart M., Gusakova N., Mariazzi S., Pandey P., Consolati G., Prelz F., Povolo L., Ciurylo R., Sharma S., Berghold M., Rodin V., Penasa L., Chehaimi A., Eliaszuk K., Sandaker H., Ferguson R. C., Klosowski L., Zawada M., Cerchiari G., Linek A., Khatri G., Burian P., Kornakov G., Sowinski T., Piwinski M., Rawat B. S., Zurlo N., Pecak D., Alfaro Campos S., Caravita R., Moskal P., Janik M. A., Vafeiadis T., Auzins M., Germann M., Munster M., Huck S., Volponi M., Bergmann B., Januszek T., Kempny K., Krumins V., Giszczak A., Brusa R. S., Camper A., Smolyanskiy P., Gustafsson F., Haider S.   +64 more
core   +1 more source

Positronium emission from mesoporous silica studied by laser-enhanced time-of-flight spectroscopy

New Journal of Physics, 2015
The use of mesoporous silica films for the production and study of positronium (Ps) atoms has become increasingly important in recent years, providing a robust source of free Ps in vacuum that may be used for a wide variety of experiments, including ...
A Deller, B S Cooper, T E Wall, D B Cassidy   +3 more
doaj   +1 more source

Velocity-selected production of 23S metastable positronium [PDF]

, 2018
Positronium in the 2S3 metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns), making it a promising candidate for interferometry experiments with a neutral matter-antimatter system.
Robert, J., Rohne O. M., F. Guatieri, B. Rienaecker, Lebrun, P., Demetrio, A., P. Lansonneur, Rotondi A., Malbrunot, C., Belov, A., Doser M., Antonello M., Testera, G., Prevedelli M., Castelli F., Amsler, C., Pagano, D., Testera G., Petracek V., A. Rotondi, Sandaker, H., Sorrentino, F., Kellerbauer, A., J. Robert, C. Zimmer, Nebbia, G., V. Matveev, G. Nebbia, Widmann E., Yzombard, P., Holmestad, H., Mariazzi S., Consolati G., Malbrunot C., Santoro R., E. Widmann, Mariazzi, S., Penasa, L., P. Hackstock, G. Testera, M. Fanì, Caccia, M., Lagomarsino, V., Lansonneur, P., S. Gerber, I. C. Tietje, Gligorova, A., H. Sandaker, Caravita, R., Pagano D., Haider, S., Smestad, L., Bonomi, G., D. Krasnický, Hackstock P., D. Comparat, Brusa, R. S., Bonomi G., Zurlo N., D. Pagano, Muller S. R., Caravita R., Fanì, M., G. Consolati, Rienaecker, B., F. Sorrentino, Consolati, G., Røhne, O.M., A. Demetrio, Gerber, S., Krasnický, D., Prevedelli, M., Prelz, F., Khalidova, O., N. Zurlo, Camper A., Comparat D., Haider S., Nedelec P., L. Penasa, Lansonneur P., L. Di Noto, Comparat, D., Sorrentino F., H. Holmestad, S. Mariazzi, Widmann, E., Guatieri, F., Müller, S. R., Guatieri F., Hackstock, P., P. Lebrun, Petracek, V., A. Hinterberger, V. Petracek, Khalidova O., Oberthaler M., Matveev V., M. Oberthaler, L. Smestad, Castelli, F., Tietje, I.C., Belov A., Smestad L., A. Gligorova, M. Antonello, Oberthaler, M., Amsler C., G. Bonomi, Zimmer, C., P. Nedelec, R. S. Brusa, O. M. Røhne, S. R. Müller, Antonello, M., Hinterberger, A., Prelz F., A. Kellerbauer, Fani M., C. Malbrunot, Zurlo, N., Di Noto L., Doser, M., Rohne, O., Santoro, R., V. Lagomarsino, Gligorova A., C. Amsler, Matveev, V., P. Yzombard, Penasa L., Müller, S.R., Yzombard P., Sandaker H., A. Belov, Cerchiari G., Lebrun P., O. Khalidova, Brusa, R.S., Caccia M., M. Prevedelli, M. Doser, Røhne, O. M., R. Caravita, R. Santoro, Lagomarsino V., Kellerbauer A., Mueller, S., M. Caccia, Nebbia G., Holmestad H., G. Cerchiari, Tietje, I., Krasnicky D., Tietje, I. C., Robert J., Hinterberger A., Brusa, R., Rotondi, A., F. Prelz, Di Noto, L., S. Haider, Gerber S., Rienaecker B., Cerchiari, G., F. Castelli, Nedelec, P., Demetrio A., Camper, A., Brusa R. S., Zimmer C., A. Camper, Tietje I. C.   +172 more
core   +1 more source