Journal ArticleDOI
The Vibrational Spectra of Molecules and Complex Ions in Crystals III. Ammonium Chloride and Deutero‐Ammonium Chloride
E. L. Wagner,D. F. Hornig +1 more
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In this paper, the infra-red spectra of thin non-scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C.Abstract:
The infra‐red spectra of thin non‐scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C. A convenient low temperature transmission type cell usable for such films is described. No indication of fine structure due to free rotation of the NH4+ ions was found. Instead, evidence is presented for the existence, both above and below the λ‐point, of a torsional lattice mode involving the NH4+ ions. The limiting frequencies of the torsional oscillations were observed at about 390 and 280 cm−1 for NH4Cl and ND4Cl, respectively. These values agree quite well with the frequencies calculated on the basis of a purely electrostatic potential function. The spectra of the low temperature modifications indicate strongly that the structures belong to the space group Td1 in which the NH4+ ion symmetry is Td. Of the eight observed bands, two are assigned to the triply degenerate fundamentals ν3 and ν4, one to the overtone 2ν4, one to the combination ν2+ν4 which resonates strongly with ν3, one to the combi...read more
Citations
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Vibrational spectrum and conformational isomerization of 3-chlorothietane
Journal ArticleDOI
Synthesis, Crystal Structure, and Thermal Property of a Potassium-ammonium Double Salt K0.48(NH4)0.52MgCl3 · 6H2O
TL;DR: By evaporating the brine containing potassium and ammonium cations compound of the composition K0.48(NH4)0.52MgCl3 · 6H2O was obtained by single crystal X-ray analysis as discussed by the authors.
Journal ArticleDOI
Electronic transitions of nickel(II) ions in cadmium ammonium sulphate hexahydrate single crystals
TL;DR: In this paper, the optical absorption spectra of Cd(NH 4 ) 2 (SO 4 2 ·6H 2 O doped Ni 2+ at 300 and 80 K was recorded and the transitions were assigned.
Journal ArticleDOI
Vibrational spectra of 1,2-bis(dihaloboryl)ethanes, Cl2BCH2CH2BCl2 and F2BCH2CH2BF2
TL;DR: In this article, the Urey-Bradley force constants were obtained for 1,2-bis(dichloroboryl)ethane and evidence was given for an acentric conformer in liquid and gas phases.
Journal ArticleDOI
Application of Internal Reflectance Spectroscopy to the Study of Solid Propellants: I. Composite and Double Base Propellants
G. E. Salser,Leonard Dauerman +1 more
TL;DR: In this paper, it is shown that by using IR spectroscopy the infrared spectra of solid propellants can be obtained with the expenditure of a minimum effort in sample preparation.
References
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Journal ArticleDOI
The Rotational Motion of Molecules in Crystals
TL;DR: In this paper, it was shown that the wave equation for a diatomic molecule in a crystal that the motion of the molecule in its dependence on the polar angles θ and φ may approach either one of two limiting cases, oscillation and rotation.
Journal ArticleDOI
The Vibrational Spectra of Molecules and Complex Ions in Crystals. I. General Theory
TL;DR: In this paper, it was shown that if a crystal is approximated as a harmonic oscillator, only a very small number of vibrational modes may be active in the infra-red or Raman spectra.
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Infra-Red and Raman Spectra of Polyatomic Molecules
TL;DR: In this paper, Herzberg's new monograph on polyatomic molecules, like that on diatomic molecules preceding it, is an admirable one and it is important to understand just what this book sets out to cover, since in spite of its very great value it cannot, taken alone, be regarded as a manual for new workers in the field.
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The Theory of the Raman Effect in Crystals, in Particular Rock-Salt
Max Born,Mary Bradburn +1 more
TL;DR: The results show that lattice dynamics can account quantitatively for the Raman effect in crystals and that Raman’s attacks against the theory are unfounded.