Open AccessDirect Two-Photon Excitation of Isomeric Transition in Thorium-229 Nucleus
Author(s) -
V. I. Romanenko,
Ye. G. Udovitskaya,
L. P. Yatsenko,
Alexander Romanenko,
А. Н. Литвинов,
G. Kazakov
Publication year - 2021
Publication title -
ukrainian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 17
eISSN - 2071-0194
pISSN - 2071-0186
DOI - 10.15407/ujpe57.11.1119
Subject(s) - excitation , atomic physics , fluorescence , photon , irradiation , wavelength , radiation , laser , nucleus , monochromatic color , physics , two photon excitation microscopy , ytterbium , ion , absorption (acoustics) , materials science , optics , nuclear physics , quantum mechanics , biology , microbiology and biotechnology
A possibility of the two-photon excitation of an isomeric state in a nucleus of thorium-229 has been discussed. The fluorescence intensity of the excitation is demonstrated to be identical for the irradiation of nuclei with either monochromatic light or polychromatic radiation consisting of a sequence of short lightpulses of the same intensity. The two-photon excitation of Th3+ ion in an electromagnetic trap with a focused laser beam with a wavelength of about 320 nm and power of 100 mW can lead to the absorption saturation, at which the fluorescence emission with the frequency of the transition in a nucleus is maximal. In crystals doped with Th4+ to a concentration of about 1018 cm-3 and irradiated with a laser radiation 10 W in power, the emission of several photons persecond with a wavelength of about 160 nm becomes possible.