Optical activity of (NH₄)SO₄

Michi Higano Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2–8–26 Nishiwaseda, Shinjuku-ku, Tokyo, 169, Japan

Toru Asahi Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2–8–26 Nishiwaseda, Shinjuku-ku, Tokyo, 169, Japan

Yasuyuki Sato Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2–8–26 Nishiwaseda, Shinjuku-ku, Tokyo, 169, Japan

Kazuya Okubo Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2–8–26 Nishiwaseda, Shinjuku-ku, Tokyo, 169, Japan

Jinzo Kobayashi Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2–8–26 Nishiwaseda, Shinjuku-ku, Tokyo, 169, Japan; Research Development Corporation of Japan

Abstract

Optical activity and birefringence of (NH₄)SO₄ were measured by using HAUP method, in the temperature range between 50 °C and -200 °C. Gyration tensor component g₁₂ appeared suddenly at T_c, and increased gradually with decrease of temperature. No other phase transition was found in this temperature range.

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Optical activity of (NH₄)SO₄

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Optical activity of (NH₄)SO₄