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Two-photon resonances revealed at three-photon ionization of samarium atom

О. І. Гомонай, Oksana Plekan

Scientific Herald of Uzhhorod University Series PhysicsDec 24, 20030 citations

Observation of singly and doubly ionized atoms in the multiphoton ionization of samarium

В. В. Суран

OptSpNov 1, 19760 citations

Enhancement of the single-colour three-photon resonance spectroscopy of highly excited states of the samarium atom

О. І. Гомонай

Scientific Herald of Uzhhorod University Series PhysicsNov 25, 20130 citations

The effect of field strength on the resonance structure of three-photon ionization spectra of the samarium atom

Aleksandr I. Gomonai, Eugene Yu. Remeta

Amplitude ratios of resonance maxima caused by two-photon transitions from different levels of the ground term of the samarium atom are studied experimentally and theoretically as functions of the laser-radiation field strength. The results of these studies are shown to be promising for identifying the resonance structure of three-photon ionization spectra of the samarium atom. A not yet observed excited even-parity state with energy E ≈ 36789.1 cm −1 and hypothetical values of total angular momentum J = 5, 6 has been discovered.Amplitude ratios of resonance maxima caused by two-photon transitions from different levels of the ground term of the samarium atom are studied experimentally and theoretically as functions of the laser-radiation field strength. The results of these studies are shown to be promising for identifying the resonance structure of three-photon ionization spectra of the samarium atom. A not yet observed excited even-parity state with energy E ≈ 36789.1 cm −1 and hypothetical values of total angular momentum J = 5, 6 has been discovered.

Optics and SpectroscopyMar 1, 20131 citation

Three-Photon Resonance Ionization Spectroscopy of Excited Even-Parity States of the Samarium Atom

Aleksandr I. Gomonai, A. N. Gomonaĭ

Excited even-parity states of the samarium atom in the energy interval 32620–34092 cm−1 have been studied by using single-color three-photon resonance ionization spectroscopy. The energies and total angular momenta of 72 states were determined. Nine new levels were revealed.

Ukrainian Journal of PhysicsDec 9, 20181 citation

Double resonances upon three-photon ionization of the samarium atom

Aleksandr I. Gomonai, Eugene Yu. Remeta

The manifestation of double resonances upon the three-photon ionization of the samarium atom has been studied in a frequency range of 17200–18400 cm −1 . Thirty peaks caused by double resonances have been found in the dependence of the yield of Sm + ions on the laser radiation frequency. The majority of these peaks greatly exceed in amplitude the peaks associated with ordinary two-photon resonances. The influence of double resonances on the three-photon ionization has been theoretically analyzed using the density matrix approximation. The calculations show that the probability of the three-photon resonance ionization can increase by more than two orders of magnitude due to the additional one-photon population of an intermediate level. The double resonance slows down the rate of increase in the probability of ionization with an increase in the laser radiation intensity compared to ordinary two-photon resonance.The manifestation of double resonances upon the three-photon ionization of the samarium atom has been studied in a frequency range of 17200–18400 cm −1 . Thirty peaks caused by double resonances have been found in the dependence of the yield of Sm + ions on the laser radiation frequency. The majority of these peaks greatly exceed in amplitude the peaks associated with ordinary two-photon resonances. The influence of double resonances on the three-photon ionization has been theoretically analyzed using the density matrix approximation. The calculations show that the probability of the three-photon resonance ionization can increase by more than two orders of magnitude due to the additional one-photon population of an intermediate level. The double resonance slows down the rate of increase in the probability of ionization with an increase in the laser radiation intensity compared to ordinary two-photon resonance.

Optics and SpectroscopyMar 1, 20101 citation

Effective schemes of samarium atom three-photon ionization

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