Element specificity of ortho-positronium annihilation for alkali-metal loaded SiO2 glasses

The Journal of Chemical Physics
K Sato, T Hatta

Abstract

Momentum distributions associated with ortho-positronium (o-Ps) pick-off annihilation photon are often influenced by light elements, as, e.g., carbon, oxygen, and fluorine. This phenomenon, so-called element specificity of o-Ps pick-off annihilation, has been utilized for studying the elemental environment around the open spaces. To gain an insight into the element specificity of o-Ps pick-off annihilation, the chemical shift of oxygen 1s binding energy and the momentum distributions associated with o-Ps pick-off annihilation were systematically investigated for alkali-metal loaded SiO2 glasses by means of X-ray photoelectron spectroscopy and positron-age-momentum correlation spectroscopy, respectively. Alkali metals introduced into the open spaces surrounded by oxygen atoms cause charge transfer from alkali metals to oxygen atoms, leading to the lower chemical shift for the oxygen 1s binding energy. The momentum distribution of o-Ps localized into the open spaces is found to be closely correlated with the oxygen 1s chemical shift. This correlation with the deepest 1s energy level evidences that the element specificity of o-Ps originates from pick-off annihilation with orbital electrons, i.e., dominantly with oxygen 2p valence ...Continue Reading

References

Jun 29, 2006·Physical Review Letters·K SatoY Kobayashi
Oct 27, 2011·The Journal of Physical Chemistry. B·Kiminori Sato
Apr 29, 2014·Physical Chemistry Chemical Physics : PCCP·Kiminori SatoMichael Hunger

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Citations

Oct 3, 2020·The Journal of Chemical Physics·Kiminori Sato, Minori Kamaya

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