Ukrainian Journal of Physics

Autoionizing Resonances in Three-Photon Ionization Spectrum of the Ytterbium Atom

Aleksandr I. Gomonai

Published Mar 1, 2015• 2 citations

Abstract

The three-photon ionization spectrum of ytterbium atoms in the interval 16814.4–18100.0 cm−1 has been studied. In addition to the resonance maxima related to the one- and two-photon excitations of bound states, the maxima originated from the three-photon excitation of autoionizing states are observed. Two new odd autoionizing levels with energies of 51866.1 and 51914.1 cm−1 are discovered.

DOI: 10.15407/ujpe60.03.0225

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Ukrainian Journal of Physics

Autoionizing Resonances in Three-Photon Ionization Spectrum of the Ytterbium Atom

Aleksandr I. Gomonai

Published Mar 1, 2015• 2 citations

Publisher

Abstract

DOI: 10.15407/ujpe60.03.0225

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The autoionizing states of ytterbium (Yb) were investigated by three-photon polarization spectroscopy. Ytterbium atoms were excited to autoionizing states through the transition 6

{\mathit{s}}^{2}

^{1}

{\mathit{S}}_{0}

--6s6p

^{3}

{\mathit{P}}_{1}

--4

{\mathit{f}}^{13}

{(}^{2}

{\mathit{F}}_{7/2}

)6${\mathit{s}}^{2}

6

{\mathit{p}}_{3/2}$ (J=2). The total angular momenta J of the autoionizing states were identified by comparing the line intensities from the spectra recorded with different combinations of the laser polarization. In this work, 17 autoionizing states including many new ones were investigated. For all these states Fano parameters and J values are measured.