Data di Pubblicazione:
2016
Abstract:
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
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
Tipologia CRIS:
1.1 Articolo in rivista
Elenco autori:
S. Aghion, 1; Amsler, 2 C.; Ariga, 3 A.; Ariga, 3 T.; Bonomi, 3 G.; Braunig, 5 P.; Bremer, ¨ 6 J.; Brusa, 7 R. S.; Cabaret, 9 L.; Caccia, 10 M.; Caravita, 11 R.; Castelli, 13 F.; Cerchiari, 14 G.; Chlouba, 15 K.; Cialdi, 16 S.; Comparat, 14 D.; Consolati, 10 G.; Demetrio, 2 A.; Di Noto, 6 L.; Doser, 13 M.; Dudarev, 7 A.; Ereditato, 7 A.; Evans, 3 C.; Ferragut, 2 R.; Fesel, 2 J.; Fontana, 7 A.; Forslund, 5 O. K.; Gerber, 7 S.; Giammarchi, 7 M.; Gligorova, 3 A.; Gninenko, 17 S.; Guatieri, 18 F.; Haider, 9 S.; Holmestad, 7 H.; Huse, 19 T.; Jernelv, 19 I. L.; Jordan, 7 E.; Kellerbauer, 15 A.; Kimura, 15 M.; Koettig, 3 T.; Krasnicky, 7 D.; Lagomarsino, 13 V.; Lansonneur, 13 P.; Lebrun, 23 P.; Lehner, 23 S.; Liberadzka, 20 J.; Malbrunot, 7 C.; Mariazzi, 20 S.; Marx, * L.; Matveev, 7 V.; Mazzotta, 21 Z.; Nebbia, 14 G.; Nedelec, 22 P.; Oberthaler, 23 M.; Pacifico, 6 N.; Pagano, 17 D.; Penasa, 5 L.; Petracek, 9 V.; Pistillo, 16 C.; Prelz, 3 F.; Prevedelli, 2 M.; Ravelli, 24 L.; Resch, 9 L.; Rienacker, 7 B.; Røhne, ¨ 7 O. M.; Rotondi, Alberto; Sacerdoti, 25 M.; Sandaker, 14 H.; Santoro, 19 R.; Scampoli, 11 P.; Smestad, 26 L.; Sorrentino, 27 F.; Spacek, 13 M.; Storey, 16 J.; Strojek, 3 I. M.; Testera, 16 G.; Tietje, 13 I.; Vamosi, 7 S.; Widmann, 20 E.; Yzombard, 20 P.; Zmeskal, 10 J.; N. Zurlo, 20; N., Zurlo
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