Overview of low energy positron physics and applications

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Presentation transcript:

Overview of low energy positron physics and applications F. Villa

Outline Low energy positron sources Physics with low energy positron Ps formation Ps physics Ps BEC & Ps2 Low energy positrons techniques PALS PLEPS SPM GiPS CDBS PAES ACAR Low energy positron in Italy All non-commented images are from the talks and the proceedings of the International School of Physics E. Fermi, Course CLXXIV Physics with many positrons

Low energy positron sources Source: gamma over threshold at 2 me Electrons (linac) Neutrons (nuclear reactors) decay (22Na) Gamma sources (Compton) Surko trap Moderation: W (10-4 efficiency) Solid rare gasses (10-2 efficiency) Two stage Surko trap with b source Accumulator: to have highly bunched positron Surko trap (Penning-Malmberg + rotating wall) Electron Linac (ELBE, ANL) Moderation of positrons

Ps formation oPs 3S1 t=142 ns pPS 1S0 t=125 ps R. Brusa, A. Dupasquier Ps Vacuum Porous solid Positron beam Positronium emission Ps formation Valence-conduction gap (semicond. only) Work functions Ps binding energy inside solid Ps ground state energy Vacuum e+ Ps Solid oPs 3S1 t=142 ns pPS 1S0 t=125 ps Time of Flight measurements

Ps physics & antihydrogen PRA 81, 012715 (2010) Nature Physics 7, 558–564 (2011) Nature 483, 439–443 (2012) PRL 106, 173401 (2011) Antihydrogen production: via collision in magnetic traps (Alpha, Atrap, Asacusa) via charge exchange of cold Ps (Aegis) Laser spectroscopy Fine structure Magnetic quenching Rydberg Ps J. Phys. Conf. Ser. 443, 012061 (2013) PRL 108, 043401 (2012)

Ps2 and other interesting items Ps2 formation and first attempts of spectroscopy (compete with spin exchange quenching) Ps Bose-Einstein Condensate Expected results: Ps as a probe for paramagnetic center in porous materials, PRB 75, 085415 (2007) PRL 108,133402 (2012) A. P. Mills, D. Cassidy

Positron Annihilation Lifetime Spectroscopy g kdefect e+ lbulk ldefect

Pulsed Low Energy Positron System

Scanning Positron Microscope

Gamma induced Positron Spectroscopy Illustration of the GiPS setup at the Forschungszentrum Dresden-Rossendorf

Coincidence Doppler Spectroscopy Spectra of each detector Krause-Rehberg, 1998 Total resolution Coincidences at DE =>Doppler broadening

Positron annihilation Auger Electron Spectroscopy Ex Vacuum Level Valence Band  Ez Ey g 3 keV e- in 30 eV e+ in 30eV -1keV Auger e- & 0-3 keV secondary e- 30eV -1keV Auger e- & 0-30 eV secondary e- A. Weiss

Angular Correlation of Annihilation Radiation

Low energy positron groups in Italy Politecnico di Milano (Polo Territoriale di Como): R. Ferragut, G. Consolati Trento: R. S. Brusa, S. Mariazzi Light alloy (Al and Mg) Solar cells Porous target for Ps production Polymers Semiconductors and thin films

Polymer/Oxide Solar Cells from R. Ferragut Polymer/Oxide Solar Cells _ + 0.8 Advantages flexible and large-area devices very favourable price/performance ratio poly(3-hexylthiophene) (Hole-transporter) hn Solar light TiO2/P3HT Glass FTO P3HT capping layer Ag Cathode TiO2 infiltrated with P3HT TiO2 flat + _ In collaboration with Istituto Italiano di Tecnologia (IIT) Energy & Environ. Sci. 5, 9068 (2012) (I.F.: 11.7)