Durable emission of positronium negative ions from Na- and K-coated W(100) surfaces

Terabe, Hiroki; Michishio, Koji; Tachibana, Takayuki; Nagashima, Yasuyuki

doi:10.1088/1367-2630/14/1/015003

Cited by 33 publications

(24 citation statements)

References 15 publications

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“…In the last decade an improved method to produce Ps − ions was developed by Nagashima and co-workers in Tokyo [543][544][545]. This method is better suited to spectroscopic investigations since it is much more efficient, and the Ps ion producing surfaces are less delicate: it is unlikely that a few nm thick carbon foil would be able to survive repeated irradiation from intense laser pulses.…”

Section: Ps − Spectroscopymentioning

confidence: 99%

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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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Section: Ps − Spectroscopymentioning

confidence: 99%

“…2.2.1) is reduced. Efficiencies up to 1.5% have been observed from Na and K coated W(1 0 0) surfaces, which can be used for many days [545]. This breakthrough has enabled many new Ps − experiments to be performed [77].…”

Section: Ps − Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…It was found that the emission efficiency is greatly enhanced by coating the surface with sub-monolayer of alkali metals. The proportion of emitted Ps -ions to the total incident positron flux is reported to be as high as 1.5% 38 . This is much larger than the fraction from a clean W surface and that from a beam-foil process through a carbon film 35 .…”

Section: Ps -(Positronium Negative Ion)mentioning

confidence: 99%

Slow positron applications at slow positron facility of institute of materials structure science, KEK

Hyodo

Mochizuki

Wada

et al. 2018

AIP Conference Proceedings

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“…A method to efficiently produce positronium negative ion (Ps − ), an exotic system composed of one positron and two electrons bound through Coulomb interaction, has been developed by Nagashima et al [2,3]. The photodetachment of the Ps − ions produced by using the pulsed positron beam in this facility was performed [4] at the branch SPF-A1.…”

Section: Ps Negative Ion Experiments Stationmentioning

confidence: 99%