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Quasi‐free rotation of the ammonium ion in crystalline NH 4 ClO 4
Author(s) -
Janik J. A.,
Janik J. M.,
Mayer J.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220440144
Subject(s) - ion , ammonium , rotation (mathematics) , chemistry , crystal (programming language) , resolution (logic) , analytical chemistry (journal) , crystallography , mathematics , geometry , organic chemistry , computer science , programming language , chromatography , artificial intelligence
The frequency distribution function g (ω) was measured by IINS in three series of experiments. The resolution Δω/ω in the ω region 15 to 120 cm −1 was about 6% in two of them and in the third one about 15%. The peaks obtained are interpreted as arising from quasi‐free rotation of ammonium ions in the crystal. Their positions and distances agree with those calculated assuming B = 6.30 cm −1 for the rotational constant of NH 4 . Their existence may be treated as a proof of a very low rotational barrier of the NH 4 groups in NH 4 ClO 4 .