Photodetachment cross sections of the positronium negative ion

Igarashi, Akinori; Shimamura, Isao; Toshima, Naoki

doi:10.1088/1367-2630/2/1/317

Cited by 59 publications

(49 citation statements)

References 31 publications

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“…The value obtained for the total photodetachment cross section was σ ≥ 2.1 × 10 −17 cm 2 , which is consistent with all calculations [550][551][552].…”

Section: Ps − Spectroscopysupporting

confidence: 90%

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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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“…The value obtained for the total photodetachment cross section was σ ≥ 2.1 × 10 −17 cm 2 , which is consistent with all calculations [550][551][552].…”

Section: Ps − Spectroscopysupporting

confidence: 90%

“…The fit also takes into account broadening and a shift of the lineshape due to the Doppler effect, which is significant in this measurement because of the high Ps ion energy. Overall the data yield a resonance energy of 5.4737(1) eV (λ = 228.07 nm) for the zero velocity transition, which is consistent with theory [529,550,557].…”

Section: Ps − Spectroscopysupporting

confidence: 83%

Experimental progress in positronium laser physics

2018

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“…The decrease was less than 3/4 because some of the Ps − ions self-annihilated before crossing the laser beam in the field free region and the laser power was not sufficient to photodetach all the Ps − crossing the laser. The lower limit of the photodetachment cross section was obtained to be 2.1×10 −17 cm 2 , which is consistent with the values calculated by Bhatia and Drachman [11], Ward and Humberston [12] and Igarashi et al [13]. …”

Section: Ps − Photodetachmentsupporting

confidence: 90%

“…The development of an efficient method of Ps − formation enables us to investigate the Ps − photodetachment, which has been investigated theoretically by several authors, as shown in figure 1 in [13]. Several resonance structures were predicted.…”

Section: Ps − Photodetachmentmentioning

confidence: 99%

“…Since the prediction by Wheeler, many theoretical studies have been performed to explore the nature of Ps − . For example, the ground-state energy and the annihilation rate have been calculated [3]- [10] and the photodetachment process has been studied [11]- [13]. However, measurements of the decay rate have been the only experiments performed for many years [14]- [16] because of extremely low Ps − intensities.…”

Section: Introductionmentioning

confidence: 99%

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Positronium negative ion experiments – formation, photodetachment and production of an energy tunable positronium beam–

Nagashima

Michishio

Tachibana

et al. 2012

J. Phys.: Conf. Ser.

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Emission of positronium negative ions from Cs deposited W(100) and polycrystalline Fe surfaces

Nagashima¹,

Hakodate

Miyamoto

et al. 2009

Phys. Status Solidi (c)

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Efficient emission of positronium negative ions from Cs deposited W(100) surface has been observed. The emission efficiency measured over a time interval of 3000 s immediately after the deposition was found to be 1.25% for the target with a 2.2 × 1014 atoms/cm2 Cs layer. The emission from Cs deposited polycrystalline Fe surface has also been observed. The upper limit of the binding energy of the ion has been estimated experimentally. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Photodetachment cross sections of the positronium negative ion

Cited by 59 publications

References 31 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Positronium negative ion experiments – formation, photodetachment and production of an energy tunable positronium beam–

Emission of positronium negative ions from Cs deposited W(100) and polycrystalline Fe surfaces

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