论文信息 - Motions of Molecules in Condensed Systems. IV. The Infra‐Red Spectra for Ammonium Nitrate and Thallous Nitrate

Motions of Molecules in Condensed Systems. IV. The Infra‐Red Spectra for Ammonium Nitrate and Thallous Nitrate

The infra‐red absorption spectra from 680 to 3600 cm−1 have been recorded for five crystalline modifications of NH4NO3 at 150°, 105°, 55°, 25°, and −40°; also the spectra from 680 to 1450 cm−1 of three modifications of TlNO3 at 170°, 100°, and 25°. Fundamental frequencies of the nitrate ion were found for NH4NO3 at 715, 830, 1050, and 1350 cm−1 (those for TlNO3 were found at approximately the same positions) and of the ammonium ion at 1430, 1760, 3100, 3200 cm−1. The spectrum of each compound remains essentially the same with change of temperature, except that in NH4NO3 at 150° and 105° the band at 715 cm−1 is absent. It is notable that bands at 1050, 1760, and 3100 cm−1, supposedly caused by symmetric vibrations, remain active in all crystal forms investigated.

William E. Keller | W. E. Keller | R. S. Halford | Ralph S. Halford

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