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10. Laser excitation of then=3level of positronium for antihydrogen production

Author

B. Rienäcker, Roberto S. Brusa, S. Vamosi, V. Petracek, Luca Penasa, I. L. Jernelv, Giovanni Cerchiari, L. Cabaret, Alberto Rotondi, T. Huse, L. Di Noto, Paola Scampoli, G. Nebbia, M. Sacerdoti, James William Storey, Sergei Gninenko, Claude Amsler, Marco Prevedelli, V. Lagomarsino, I. C. Tietje, Simone Cialdi, M. Kimura, Adriano Fontana, E. Jordan, Sebastian Gerber, Heidi Sandaker, K. Chlouba, Sebastiano Mariazzi, Giovanni Consolati, Germano Bonomi, A. Demetrio, F. Guatieri, Massimo Caccia, M. Spacek, L. Resch, Nicola Zurlo, C. Evans, P. Bräunig, J. Bremer, F. Prelz, Viktor Matveev, E. Widmann, C. Pistillo, Ruggero Caravita, Akitaka Ariga, Ola Kenji Forslund, Davide Pagano, Rafael Ferragut, S. Haider, Daniel Comparat, Alexey Dudarev, J. Fesel, Ole Røhne, Romualdo Santoro, Stefano Aghion, Marco Giammarchi, Sebastian Lehner, Z. Mazzotta, Felice Sorrentino, Alban Kellerbauer, Chloé Malbrunot, P. Lebrun, D. Krasnicky, L. Marx, Nicola Pacifico, P. Lansonneur, L. Ravelli, I. M. Strojek, T. Koettig, Lillian Smestad, H. Holmestad, Antonio Ereditato, Tomoko Ariga, G. Testera, Fabrizio Castelli, Patrick Nedelec, Michael Doser, Johann Zmeskal, J. Liberadzka, M. Oberthaler, Angela Gligorova, P. Yzombard, Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Forslund, O. K., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jernelv, I. L., Jordan, E., Kellerbauer, A., Kimura, M., Koettig, T., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Lehner, S., Liberadzka, J., Malbrunot, C., Mariazzi, S., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, Marco, Ravelli, L., Resch, L., Rienäcker, B., Røhne, O. M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Smestad, L., Sorrentino, F., Spacek, M., Storey, J., Strojek, I. M., Testera, G., Tietje, I., Vamosi, S., Widmann, E., Yzombard, P., Zmeskal, J., Zurlo, N., Prevedelli, M., Scampoli, Paola, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS

Subjects
COLLISIONS, Atomic and Molecular Physics, and Optics, ANNIHILATION LIFETIME, SLOW POSITRONS, TRANSITION, PHYSICS, ANTIPROTONS, TRANSPORT, PLASMA, STATES, 530 Physics, Spectroscopy, particle physics, 01 natural sciences, 010305 fluids & plasmas, law.invention, Positronium, Nuclear physics, law, Atomic and Molecular Physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, Plasma, Laser, Atomic and Molecular Physics, and Optics, Antiproton, and Optics, Atomic physics, ANNIHILATION LIFETIME, Particle Physics - Experiment, Excitation
Abstract

We demonstrate laser excitation of the n=3 state of positronium (Ps) in vacuum. A specially designed high-efficiency pulsed slow positron beam and single shot positronium annihilation lifetime spectroscopy were used to produce and detect Ps. Pulsed laser excitation of n=3 level at 205 nm was monitored via Ps photoionization induced by a second intense laser pulse at 1064 nm. About 15% of the overall positronium emitted in vacuum was excited to n=3 and photoionized. Saturation of both the n=3 excitation and the following photoionization was observed and is explained by a simple rate equation model. Scanning the laser frequency allowed us to extract the positronium transverse temperature related to the width of the Doppler-broadened line. Moreover, preliminary observation of excitation to Rydberg states (n = 15...17) using n=3 as intermediate level was observed, giving an independent confirmation of efficient excitation to the 33P state. We demonstrate the laser excitation of the n=3 state of positronium (Ps) in vacuum. A combination of a specially designed pulsed slow positron beam and a high-efficiency converter target was used to produce Ps. Its annihilation was recorded by single-shot positronium annihilation lifetime spectroscopy. Pulsed laser excitation of the n=3 level at a wavelength λ≈205 nm was monitored via Ps photoionization induced by a second intense laser pulse at λ=1064 nm. About 15% of the overall positronium emitted into vacuum was excited to n=3 and photoionized. Saturation of both the n=3 excitation and the following photoionization was observed and explained by a simple rate equation model. The positronium's transverse temperature was extracted by measuring the width of the Doppler-broadened absorption line. Moreover, excitation to Rydberg states n=15 and 16 using n=3 as the intermediate level was observed, giving an independent confirmation of excitation to the $3^{3}P$ state.

Published
2016
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