Angle-resolved positronium emission spectroscopy

Chen, D. M.; Berko, S.; Canter, K. F.; Lynn, Kelvin G.; Mills, A. P.; Roellig, L. O.; Sferlazzo, P.; West, R N

doi:10.1103/physrevlett.58.921

Cited by 37 publications

(18 citation statements)

References 13 publications

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“…4, middle), but an offcenter peak grows in at 486 o C (Fig. 4, right), characteristic for p-Ps emission from the outer surface of the layer [27,28]. This is consistent with a complete evaporation of the CdSe layer for a part of the sample area, since p-Ps emission is energetically forbidden for bare CdSe surfaces [11], but was previously observed for the Au(100) surface [29].…”

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confidence: 81%

Meeting challenges in nanomaterials for sustainable energy applications using high‐resolution positron methods

Eijt

2009

Phys. Status Solidi (c)

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Positron methods are promising as in‐situ depth‐resolved probes for the study of the (electronic) structure of semiconductor nanocrystals embedded in active thin layers of future generation solar cells, and of metal hydride thin films with applications as hydrogen sensors and hydrogen switchable mirrors. The (time‐resolved) evolution of the positron‐electron momentum distribution is presented, associated with two sintering steps observed upon heating pyridine‐capped CdSe nanocrystal films in a vacuum. The metal‐to‐insulator transition upon hydrogenation of Mg and Mg2Ni thin films to MgH2 and Mg2NiH4 leads to a clear broadening of the electron momentum distribution, and a strong decrease in the lineshape parameter S. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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confidence: 81%

Meeting challenges in nanomaterials for sustainable energy applications using high‐resolution positron methods

Eijt

2009

Phys. Status Solidi (c)

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“…In any case, Ps emission can be viewed as being directly analogous to angle resolved photoemission spectroscopy. However, previous experiments in this area [234,255,485] have not been competitive with standard techniques such as ARPES in terms of the available energy resolution. An experiment using a high-resolution TOF arrangement was performed to measure the kinetic energy of Ps directly emitted from a Cu (1 1 0) surface [137].…”

Section: High Resolution Rydberg Time-of-flight Spectroscopymentioning

confidence: 99%

“…Processes that remove a single electron from metal surfaces can in some cases act as probes of the electronic structure of that surface. The most well-known example of this is angle-resolved photoemission (ARPES) [484], but a similar role may be played by Ps [234,485] if the momentum of the emitted Ps atom is measured, either by TOF or ACAR methods. As discussed in Section 2.2.1, in some metals it is energetically possible for a thermalized positron to form a bound state with an electron just inside the surface, and be emitted as a Ps atom.…”

Section: High Resolution Rydberg Time-of-flight Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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“…The atoms are emitted in a direction normal to the surface with a few mrd angular spread [11]. Their energy is ∼ 2 eV and their speed is ∼1 mm/ns.…”

Section: Introductionmentioning

confidence: 99%

A new path toward gravity experiments with antihydrogen

Pérez

Rosowsky

2005

AIP Conference Proceedings

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We propose to use a 13 KeV antiproton beam passing through a dense cloud of positronium (Ps) atoms to produce an H + "beam". These ions can be slowed down and captured by a trap. The process involves two reactions with large cross sections under the same experimental conditions. These reactions are the interaction of p with P S to produce H and the e + capture by H reacting on P S to produce H + .Once decelerated with an electrostatic field and captured in a trap the H + ions could be cooled and the e + removed with a laser to perform a measurement of the gravitational acceleration of neutral antimatter in the gravity field of the Earth.

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Angle-resolved positronium emission spectroscopy

Cited by 37 publications

References 13 publications

Meeting challenges in nanomaterials for sustainable energy applications using high‐resolution positron methods

Meeting challenges in nanomaterials for sustainable energy applications using high‐resolution positron methods

Experimental progress in positronium laser physics

A new path toward gravity experiments with antihydrogen

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