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Optics and Spectroscopy

Resonance three-photon ionization of samarium atom by laser radiation in the range from 17200 to 17900 cm−1

Aleksandr I. Gomonai, О. И. Куделич

Published Aug 1, 2002• 4 citations
Publisher

Abstract

For the first time, three-photon ionization of a samarium atom in the spectral range between 17200 and 17900 cm −1 was studied. More than 300 peaks with different amplitudes and shape are revealed in the spectral efficiency of the Sm + ion formation. The majority of peaks observed is attributed to two-photon excitation of the bound even-parity states in the energy range above 35780 cm −1 . The energies and the total momenta of the states are determined.

DOI
10.1134/1.1503746

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Optics and Spectroscopy•Mar 1, 2009•0 citations
For the first time, three-photon ionization of a samarium atom in the spectral range between 17200 and 17900 cm −1 was studied. More than 300 peaks with different amplitudes and shape are revealed in the spectral efficiency of the Sm + ion formation. The majority of peaks observed is attributed to two-photon excitation of the bound even-parity states in the energy range above 35780 cm −1 . The energies and the total momenta of the states are determined.
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.
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.
The manifestation of spontaneous Raman scattering upon the three-photon ionization of a samarium atom has been investigated. The dependence of the Sm+ yield on the laser frequency, along with the peaks due to the two-photon excitation of bound states from different levels of the 4f 66s 2 7 F ground term, exhibits a strong peak due to single-photon excitation of the 4f 55d6s 2 7 D°3 state from the 4f 65d6s 9 H 2 excited state. The 4f 65d6s 9 H 2 state was populated as a result of spontaneous Raman scattering. The large amplitude of the observed peak indicates a high efficiency of this process. The estimations performed indicate that the probability of resonant ionization through an excited state populated due to spontaneous Raman scattering can be comparable with the probability of three-photon ionization through the two-photon intermediate resonance. The necessary conditions for implementing this channel of resonant three-photon ionization are formulated.