Observation of a Low Energy Component of Positronium Emitted from Alkali-Metal Coated Polycrystalline Tungsten Surfaces

Shimpei Iida; Hiroki Terabe; Takayuki Tachibana; Ken Wada; Izumi Mochizuki; Akira Yagishita; Toshio Hyodo; Yasuyuki Nagashima

doi:10.4028/www.scientific.net/DDF.373.309

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 373Observation of a Low Energy Component of...

Observation of a Low Energy Component of Positronium Emitted from Alkali-Metal Coated Polycrystalline Tungsten Surfaces

Abstract:

We have studied the emission of ortho-positronium from alkali-metal coated polycrystalline tungsten surfaces. The positronium time-of-flight spectra show that the yield of the 5 eV positronium component increases by alkali-metal coating. In addition, a low energy positronium component appears by Cs or K coating. We suggest that this component is due to positron energy loss by inter-band transition or surface plasmon excitation.

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Periodical:

Defect and Diffusion Forum (Volume 373)

Pages:

309-312

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.373.309

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Online since:

March 2017

Authors:

Shimpei Iida*, Hiroki Terabe, Takayuki Tachibana, Ken Wada, Izumi Mochizuki, Akira Yagishita, Toshio Hyodo, Yasuyuki Nagashima

Keywords:

Alkali-Metal, Inter-Band Transition, Positronium, Surface Plasmon, Time-of-Flight, Tungsten

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References

[1] A.P. Mills, Jr., Experimentation with low-energy positron beams, in: W. Brandt, A. Dupasquier (Eds. ), Positron Solid-State Physics, North-Holland, Amsterdam, 1983, pp.432-509.

Google Scholar

[2] P.J. Schultz and K.G. Lynn, Interaction of positron beams with surfaces, thin films, and interfaces, Rev. Mod. Phys. 60 (1988) 701-779.

DOI: 10.1103/revmodphys.60.701

Google Scholar

[3] W.M. Haynes, T.J. Bruno, D.R. Lide, G. Baysinger, L.I. Berger, M. Frenkel, R.N. Goldberg, K. Kuchitsu, D.L. Roth and D. Zwillinger, CRC Handbook of Chemistry and Physics on DVD, CRC Press, Boca Raton, (2013).

Google Scholar

[4] A.H. Weiss and P.G. Coleman, Surface science with positrons, in: P.G. Coleman (Ed. ), Positron Beams and their Applications, World Scientific, Singapore, 2000, pp.129-189.

DOI: 10.1142/9789812817754_0005

Google Scholar

[5] A.P. Mills, Jr. and L. Pfeiffer, Desorption of surface positrons: a source of free positronium at thermal velocities, Phys. Rev. Lett. 43 (1979) 1961-(1964).

DOI: 10.1103/physrevlett.43.1961

Google Scholar

[6] A.P. Mills, Jr., L. Pfeiffer and P.M. Platzman, Positronium velocity spectroscopy of the electronic density of states at a metal surface, Phys. Rev. Lett. 51 (1983) 1085-1088.

DOI: 10.1103/physrevlett.51.1085

Google Scholar

[7] R.H. Howell, I.J. Rosenberg and M.J. Fluss, Production of energetic positronium at metal surfaces, Phys. Rev. B 34 (1986) 3069-3075.

DOI: 10.1103/physrevb.34.3069

Google Scholar

[8] Y. Nagashima, Y. Morinaka, T. Kurihara, Y. Nagai, T. Hyodo, T. Shidara and K. Nakahara, Origins of positronium emitted from SiO2, Phys. Rev. B 58 (1998) 12676-12679.

DOI: 10.1103/physrevb.58.12676

Google Scholar

[9] H. Terabe, S. Iida, T. Yamashita, T. Tachibana, B. Barbiellini, K. Wada, I. Mochizuki, A. Yagishita, T. Hyodo and Y. Nagashima, Increase in the positronium emission yield from polycrystalline tungsten surfaces by sodium coating, Sur. Sci. 641 (2015).

DOI: 10.1016/j.susc.2015.05.012

Google Scholar

[10] K. Wada, T. Hyodo, T. Kosuge, Y. Saito, M. Ikeda, S. Ohsawa, T. Shidara, K. Michishio, T. Tachibana, H. Terabe, R. H. Suzuki, Y. Nagashima, Y. Fukaya, M. Maekawa, I. Mochizuki and A. Kawasuso, New experiment stations at KEK Slow Positron Facility, J. Phys. Conf. Ser. 443 (2013).

DOI: 10.1088/1742-6596/443/1/012082

Google Scholar

[11] A.U. MacRae, K. M¨uller, J.J. Lander, J. Morrison and J.C. Phillips, Electronic and lattice structure of cesium films adsorbed on tungsten, Phys. Rev. Lett. 22 (1969) 1048-1051.

DOI: 10.1103/physrevlett.22.1048

Google Scholar

[12] J. Cousty, R. Riwan and P. Soukiassaian, Adsorption of alkali metals on W(100) : an EELS study, J. Phys. (Paris) 46 (1985) 1693-1698.

DOI: 10.1051/jphys:0198500460100169300

Google Scholar

[13] P. Soukiassian, R. Riwan, J. Lecante, E. Wimmer, S.R. Chubb and A.J. Freeman, Adsorbateinduced shifts of electronic surface states: Cs on the (100) faces of tungsten, molybdenum, and tantalum, Phys. Rev. B 31 (1985) 4911-4923.

DOI: 10.1103/physrevb.31.4911

Google Scholar

[14] R.E. Palmer and S.E. Schnatterly, Observation of surface plasmons and measurement of the optical constants for sodium and potassium, Phys. Rev. B 4 (1971) 2329-2339.

DOI: 10.1103/physrevb.4.2329

Google Scholar