Submillimeter ESR spectra of Fe2+ ions in synthetic and natural beryl crystals


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Abstract

Electron spin resonance spectra of non-Kramers bivalent iron (Fe2+) ions have been detected in synthetic and natural beryl crystals with an iron impurity. The observed ESR spectra have been attributed to resonance transitions of Fe2+ ions from the ground (singlet) state to excited (doublet) levels with the splitting Δ = 12.7 cm–1 between the levels. The experimental angular and frequency dependences of the resonance field of the ESR signal have been described by the spin Hamiltonian with the effective spin S = 1. The analysis of the ESR data and optical absorption spectra indicates that the Fe2+ ions are situated in tetrahedral positions and substitute Be2+ cations in the beryl structure.

About the authors

G. S. Shakurov

Kazan Physicotechnical Institute, Kazan Scientific Center

Author for correspondence.
Email: shakurov@kfti.knc.ru
Russian Federation, Kazan

R. I. Khaibullin

Kazan Physicotechnical Institute, Kazan Scientific Center

Email: shakurov@kfti.knc.ru
Russian Federation, Kazan

V. G. Tomas

Institute of Geology and Mineralogy, Siberian Branch

Email: shakurov@kfti.knc.ru
Russian Federation, Novosibirsk

D. A. Fursenko

Institute of Geology and Mineralogy, Siberian Branch

Email: shakurov@kfti.knc.ru
Russian Federation, Novosibirsk

R. I. Mashkovtsev

Institute of Geology and Mineralogy, Siberian Branch

Email: shakurov@kfti.knc.ru
Russian Federation, Novosibirsk

O. N. Lopatin

Kazan (Volga region) Federal University

Email: shakurov@kfti.knc.ru
Russian Federation, Kazan

A. G. Nikolaev

Kazan (Volga region) Federal University

Email: shakurov@kfti.knc.ru
Russian Federation, Kazan

B. P. Gorshunov

Prokhorov General Physics Institute; Moscow Institute of Physics and Technology (State University)

Email: shakurov@kfti.knc.ru
Russian Federation, Moscow; Dolgoprudnyi, Moscow region, 141700

E. S. Zhukova

Prokhorov General Physics Institute; Moscow Institute of Physics and Technology (State University)

Email: shakurov@kfti.knc.ru
Russian Federation, Moscow; Dolgoprudnyi, Moscow region, 141700

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