https://www.elibrary.ru/title_about_new.asp?i Global Energy Глобальная энергия 2782-6724 45 EFFECT OF ISOTOPIC PURITY ON THE OPTICAL РROPERTIES  OF GERMANIUM Исследование влияния изотопической чистоты  на оптические свойства германия Rogalin Vladimir v-rogalin@mail.ru Tsenina Irina v-rogalin@mail.ru Kaplunov Ivan Ivan.Kaplunov@tversu.ru 10 12 2013 4 183 1 353 358

A study is made of the optical properties of germanium single crystals with natural isotopic composition and isotopically pure crystals of 70Ge и 74Ge. A dependence is found of the decrease of the frequency of phonon band absorption maxima with the increase of the germanium mass number.

 SINGLE CRYSTALS. GERMANIUM. ISOTOPES. INFRARED OPTICS. PHONON ABSORPTION.