The absolute intensities of the two infrared active fundamentals of the ammonium ion, ngr;3and ngr;4, have been studied in several environments. Dilute solid solutions of NH4+ions in KCl, KI, CsCl, and CsI were studied and compared with pure NH4I. After separating the effect of the net charge, the apparent bond moments ranged from 0.63 d to 0.80 d (av 0.71) and the bond dipole derivatives, part;mgr;/part;r,from 2.06 d/A to 3.59 d/A (av 2.80 d/A). The bond moment is substantially the same as in NH3.
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