Professor Igor' Mendelevich Beterov, Doctor of Physico-mathematical Sciences, died unexpectedly on 4 September 1999. Professor Beterov headed the Department of Quantum Electronics at the Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, and was widely known for his work on nonlinear laser spectroscopy, atomic beam spectroscopy, and the physics of Rydberg atoms. The results of his studies have been and continue to be extensively used in this country and abroad.
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