Laser excitation of the n=3 level of positronium for antihydrogen production
- 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, M.
- 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.
DOIAbstract
International audienceWe 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 ...
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