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
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Ir study of hydrogen bonding in sodium chloride dihydrate
T. A. Ford,Michael Falk +1 more
TL;DR: In this paper, the IR spectrum of HDO at low isotopic concentration in NaCl and NaCl.2D2O was measured in the region of OH and OD stretching fundamentals.
Journal ArticleDOI
The Nature of the Gradual Transition in NH4Cl and ND4Cl
Journal ArticleDOI
X-ray and Raman study of the low temperature NH4MnF3 structure; evidence of librational motion of the NH4+ ion
Mariano Laguna,María Luisa Sanjuán,Victor M. Orera,Javier Rubín,E Palacios,M C Pique,Juan Bartolomé,J F Berar +7 more
TL;DR: The structure of the low temperature phase of NH4MnF3 has been determined by means of X-ray powder diffraction using the Rietveld method.
Journal ArticleDOI
Optical absorption spectrum of Cu2+ doped in NH4Cl single crystal
S.V.J. Lakshman,J. Lakshmana Rao +1 more
TL;DR: In this paper, a spin-orbit coupling associated with a tetragonal field has been used to derive the absorption bands of ammonium chloride at room temperature and liquid-air temperatures.
Journal ArticleDOI
Electronic absorption spectrum of Ni2+ doped in NH4Cl single crystal
TL;DR: The absorption spectrum of Ni2+ doped ammonium chloride was studied in the temperature range of 293-77°K as discussed by the authors, and it was concluded that Ni 2+ goes interstitially.
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.