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

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Title: Two-Photon Mechanism of the Excitation of Exciton States in Noble Gas Cryocrystals.
Authors: Myzin, D. A.1 (AUTHOR) DAMyzin@mephi.ru, Borisyuk, P. V.1 (AUTHOR), Gubskii, K. L.1 (AUTHOR), Didenko, N. V.2 (AUTHOR), Korneev, F. A.1 (AUTHOR), Kuznetsov, A. P.1 (AUTHOR), Lebedinskii, Yu. Yu.1,3 (AUTHOR), Nauryzbaev, Zh. M.1 (AUTHOR), Popruzhenko, S. V.1 (AUTHOR), Tkalya, E. V.1,4,5 (AUTHOR), Chubunova, E. V.1 (AUTHOR), Shilov, V. A.1 (AUTHOR)
Source: JETP Letters. Oct2025, Vol. 122 Issue 8, p480-485. 6p.
Subjects: Krypton, Two-photon absorbing materials, Solid rare gases, Photoluminescence, Thorium, Exciton theory, Laser beams, Nuclear excitation
Abstract: 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 W/cm2. The observed broad photoluminescence line arising from the relaxation of excited exciton states covers the 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract: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 W/cm2. The observed broad photoluminescence line arising from the relaxation of excited exciton states covers the 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. [ABSTRACT FROM AUTHOR]
ISSN:00213640
DOI:10.1134/S002136402560853X