Single-colour resonance three-photon ionization of Sm atoms is studied within the 542.4-581.6 nm spectral range. Wavenumber dependence of the Sm + ion yield shows more than 600 maxima of different amplitudes and shapes. Most of the resonance structure observed is due to two-photon excitation of even-parity bound states lying in the 34 713.1-40 526.7 cm −1 energy range. Fifteen new even-parity bound states have been found. Their energies and total momenta have been determined.
Highly excited even parity states of the samarium atom in the range between 34104 and 39155 cm -1 have been studied by the method of one color three photon resonance ionization spectroscopy. The energies and total angular momenta of 342 states have been determined. Seven new even parity states of samarium have been discovered.
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