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Journal of Sol-Gel Science and Technology

, Volume 73, Issue 3, pp 580–585 | Cite as

Preparation technique of thorium films by electrochemical deposition for nuclear optical frequency standard based on thorium-229

  • P. V. BorisyukEmail author
  • O. S. Vasilyev
  • A. V. Krasavin
  • Yu. Yu. Lebedinskii
  • V. I. Troyan
Original Paper

Abstract

The increase of the accuracy of optical frequency standards by means of the development of nuclear clocks a novel frequency standard based on the nuclear transition to the long-living isomer nuclear state of Th-229 with energy ~7.6 eV is of great interest. The main problem is the fact that there are no experimental data on the direct measurement of the energy of the isomeric transition in Th-229, and the above result was obtained only by indirect measurements, and has great uncertainty. Low energy ion scattering spectroscopy might be used for more precision investigations of the isomeric transition in Th-229. It is caused by the fact that ion scattering spectra exhibit the fine structure determined by the target surface electronic structure. In the case of low energy nuclear transition it can give the information about the isomer nuclear state of Th-229. To prove this supposition it is necessary to prepare high quality samples with a high thorium surface coverage. An original preparation technique of the thorium films by electrochemical deposition from thorium nitrate solution on Si(111) substrate is reported. It was found that electrochemical deposition of Th on the semiconductor substrates leads to the formation of ThSiOx island films. The origin of the observed thorium films formation and the results on the investigation of 229Th and 232Th films on Si(111) surface by X-ray photoelectron spectroscopy and low energy ion spectroscopy discussed.

Keywords

Electro-chemical deposition Thorium oxide clusters Band structure Nuclear frequency standard XPS REELS LEIS 

Notes

Acknowledgments

The work was supported by Russian Foundation for Basic Research (Projects 12-08-01098 and 14-08-00487) and by Ministry of Education and Science of the Russian Federation in the frame of the government task no. 3.1803.2014/K.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • P. V. Borisyuk
    • 1
    Email author
  • O. S. Vasilyev
    • 1
  • A. V. Krasavin
    • 1
  • Yu. Yu. Lebedinskii
    • 1
  • V. I. Troyan
    • 1
  1. 1.National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute)MoscowRussia

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