This article is cited in 12 papers

Laser photoionisation

Effect of amplified spontaneous emission on selectivity of laser photoionisation of the ¹⁷⁷Lu radioisotope

A. B. D'yachkov, A. A. Gorkunov, A. V. Labozin, S. M. Mironov, V. Ya. Panchenko, V. A. Firsov, G. O. Tsvetkov

Russian Research Centre "Kurchatov Institute", Moscow

Abstract: A significant deselecting effect of amplified spontaneous emission has been observed in the experiments on selective laser photoionisation of the ¹⁷⁷Lu radioisotope according to the scheme 5d6s^{2 2}D_3/2 → 5d6s6p ⁴F^o_5/2 (18505 cm^-1) → 5d6s7s ⁴D_3/2(37194 cm^-1) → autoionisation state (53375 cm^-1). The effect is conditioned by involvement of non-target isotopes from the lower metastable level 5d6s^{2 2}D_5/2(1994 cm^-1) into the ionisation process. Spectral filtering of spontaneous emission has allowed us to significantly increase the selectivity of the photoionisation process of the radioisotope and to attain a selectivity value of 10⁵ when using saturating light intensities.

Keywords: selectivity, laser photoionisation, ¹⁷⁷Lu isotope, dye laser, amplified spontaneous emission, metastable state, mass spectrum.

Received: 21.01.2016

 English version: Quantum Electronics, 2016, 46:6, 574–577

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