Laser excitation of the n=3 level of positronium for antihydrogen production

被引：64

作者：

Aghion, S. ^{[1
,2
]}

Amsler, C. ^{[3
]}

Ariga, A. ^{[3
]}

Ariga, T. ^{[3
]}

Bonomi, G. ^{[4
,5
]}

Braunig, P. ^{[6
]}

Bremer, J. ^{[7
]}

Brusa, R. S. ^{[8
,9
]}

Cabaret, L. ^{[10
]}

Caccia, M. ^{[2
,11
]}

Caravita, R. ^{[12
,13
]}

Castelli, F. ^{[2
,14
]}

Cerchiari, G. ^{[15
]}

Chlouba, K. ^{[16
]}

Cialdi, S. ^{[2
,14
]}

Comparat, D. ^{[10
]}

Consolati, G. ^{[1
,2
]}

Demetrio, A. ^{[6
]}

Di Noto, L. ^{[12
,13
]}

Doser, M. ^{[8
]}

Dudarev, A. ^{[8
]}

Ereditato, A. ^{[3
]}

Evans, C. ^{[1
,2
]}

Ferragut, R. ^{[1
,2
]}

Fesel, J. ^{[7
]}

Fontana, A. ^{[5
]}

Forslund, O. K. ^{[7
]}

Gerber, S. ^{[7
]}

Giammarchi, M. ^{[2
,3
]}

Gligorova, A. ^{[17
]}

Gninenko, S. ^{[18
]}

Guatieri, F. ^{[8
,9
]}

Haider, S. ^{[7
]}

Holmestad, H. ^{[19
]}

Huse, T. ^{[19
]}

Jernelv, I. L. ^{[7
]}

Jordan, E. ^{[15
]}

Kellerbauer, A. ^{[15
]}

Kimura, M. ^{[3
]}

Koettig, T. ^{[7
]}

Krasnicky, D. ^{[12
,13
]}

Lagomarsino, V. ^{[12
,13
]}

Lansonneur, P. ^{[22
]}

Lebrun, P. ^{[22
]}

Lehner, S. ^{[20
]}

Liberadzka, J. ^{[7
]}

Malbrunot, C. ^{[20
]}

Mariazzi, S. ^{[20
]}

Marx, L.

Matveev, V. ^{[21
]}

机构：

[1] Politecn Milan, I-20133 Milan, Italy

[2] Ist Nazl Fis Nucl Milano, I-20133 Milan, Italy

[3] Univ Bern, Albert Einstein Ctr Fundamental Phys, Lab High Energy Phys, CH-3012 Bern, Switzerland

[4] Univ Brescia, Dept Mech & Ind Engn, I-25123 Brescia, Italy

[5] Ist Nazl Fis Nucl Pavia, I-27100 Pavia, Italy

[6] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany

[7] CERN, Dept Phys, CH-1211 Geneva 23, Switzerland

[8] Univ Trent, Dept Phys, Trento, Italy

[9] TIFPA, Ist Nazl Fis Nucl Trento, Trento, Italy

[10] Univ Paris Sud, Ctr Natl Rech Sci, ENS Cachan, Lab Aim Cotton, F-91405 Orsay, France

[11] Univ Insubria, Dept Sci, I-22100 Como, Italy

[12] Univ Genoa, Dept Phys, I-16146 Genoa, Italy

[13] Ist Nazl Fis Nucl Genova, I-16146 Genoa, Italy

[14] Univ Milan, Dept Phys, I-20133 Milan, Italy

[15] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany

[16] Czech Tech Univ, Prague 11519, Czech Republic

[17] Univ Bergen, Inst Phys & Technol, N-5007 Bergen, Norway

[18] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[19] Univ Oslo, Dept Phys, N-0371 Oslo, Norway

[20] Austrian Acad Sci, Stefan Meyer Inst Subat Phys, Boltzmanngasse 3, A-1090 Vienna, Austria

[21] Joint Nucl Res Inst, Dubna 141980, Russia

[22] Ist Nazl Fis Nucl Padova, I-35131 Padua, Italy

[23] Univ Lyon 1, Ctr Natl Rech Sci, Inst Nucl Phys, F-69622 Villeurbanne, France

[24] Univ Bologna, I-40126 Bologna, Italy

[25] Univ Pavia, Dept Phys, I-27100 Pavia, Italy

[26] Univ Naples Federico II, Dept Phys, I-80126 Naples, Italy

[27] Res Council Norway, Lysaker, Norway

[28] Univ Brescia, Dept Civil Engn, I-25123 Brescia, Italy

来源：

PHYSICAL REVIEW A | 2016年 / 94卷 / 01期

基金：

欧洲研究理事会;

关键词：

ANNIHILATION LIFETIME; ANTIPROTONS; TRANSITION; COLLISIONS; TRANSPORT; PLASMA; STATES;

D O I：

10.1103/PhysRevA.94.012507

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 lambda approximate to 205 nm was monitored via Ps photoionization induced by a second intense laser pulse at lambda = 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 P-3 state.

引用

页数：7

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