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<p>The results of an experiment on the two-photon excitation of exciton states in krypton cryocrystals by the fifth harmonic of 209-nm laser radiation have been presented. It has been shown that the two-photon excitation mechanism allows reaching a density of 10<sup>16</sup> cm<sup>−3</sup> of free excitons with an excitation energy of ~8.4 eV at a focal radiation intensity of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\( \approx {{10}^{{11}}}{\kern 1pt} \)</EquationSource> <!--JETPLet2560853Myzin-m1--> </InlineEquation> W/cm<sup>2</sup>. The observed broad photoluminescence line arising from the relaxation of excited exciton states covers the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(3{\text{/}}{{2}^{ + }}(8.4{\kern 1pt} \;{\text{eV}}) \to 5{\text{/}}{{2}^{ + }}(0.0)\)</EquationSource> <!--JETPLet2560853Myzin-m2--> </InlineEquation> low-energy nuclear isomeric transition in <sup>229</sup>Th. Analytical estimates showing that two-photon laser generation of exciton states in noble gas crystals can be used as a new method for the excitation of the nuclear isomeric state of thorium at a pump intensity of ~10<sup>11</sup> W/cm<sup>2</sup> have been provided.</p>

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Two-Photon Mechanism of the Excitation of Exciton States in Noble Gas Cryocrystals

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. A. Myzin,
  • P. V. Borisyuk,
  • K. L. Gubskii,
  • N. V. Didenko,
  • F. A. Korneev,
  • A. P. Kuznetsov,
  • Yu. Yu. Lebedinskii,
  • Zh. M. Nauryzbaev,
  • S. V. Popruzhenko,
  • E. V. Tkalya,
  • E. V. Chubunova,
  • V. A. Shilov

摘要

The results of an experiment on the two-photon excitation of exciton states in krypton cryocrystals by the fifth harmonic of 209-nm laser radiation have been presented. It has been shown that the two-photon excitation mechanism allows reaching a density of 1016 cm−3 of free excitons with an excitation energy of ~8.4 eV at a focal radiation intensity of \( \approx {{10}^{{11}}}{\kern 1pt} \) W/cm2. The observed broad photoluminescence line arising from the relaxation of excited exciton states covers the \(3{\text{/}}{{2}^{ + }}(8.4{\kern 1pt} \;{\text{eV}}) \to 5{\text{/}}{{2}^{ + }}(0.0)\) low-energy nuclear isomeric transition in 229Th. Analytical estimates showing that two-photon laser generation of exciton states in noble gas crystals can be used as a new method for the excitation of the nuclear isomeric state of thorium at a pump intensity of ~1011 W/cm2 have been provided.