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Raman -spectra pipard relations and critical exponents for NH4CL
Date
1984-01-01
Author
Yurtseven, Hasan Hamit
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Subject Keywords
Chemistry
,
Physical
URI
https://hdl.handle.net/11511/51502
Journal
JOURNAL OF MOLECULAR STRUCTURE
DOI
https://doi.org/10.1016/0022-2860(84)80042-3
Collections
Department of Physics, Article
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RAMAN-STUDY NH4C1 NEAR THE TRICRITICAL POINT
Yurtseven, Hasan Hamit (1982-01-01)
The Raman spectrum of NH4Cl has been studied as a function of temperature and pressure close to the multicritical point at which the λ-transition changes from first to second order. Variations in the intensities of appropriate bands have been used to calculate the critical exponents for the order parameter. By varying the temperature at fixed pressures of zero, 3.0 k bar and 1.5 k bar, exponent values of β = 0.154 ± 0.012, β = 0.33 ± 0.06 and β = 0.26 ± 0.06 have been obtained for the first-order, second-or...
RAMAN-STUDY OF AMMONIUM HALIDES TREATED AS AN ISING PSEUDOSPIN-PHONON COUPLED SYSTEM
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Raman spectroscopy has been used to study the λ-transition regions of NH4Cl and NH4Br. An Ising pseudospin-phonon coupled model has been fitted to the observed Raman data. In particular we report here the results of fitting the model to the frequencies and damping constants of the non-soft TO component of the lattice modes of NH4Cl and NH4Br. Both crystals have the orientations of their NH+4 ions disordered at temperatures above their λ transitions, and have (orientation-ignored) Oh structures (β) containin...
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Ab initio potentials are computed for alkali metal cationic partners interacting with He-4 and an overall many-body potential is constructed for each of the ionic dopants in helium clusters. The structures are then obtained via a genetic algorithm approach and results compared with Basin-Hopping Monte Carlo simulations. The classical arrangements are analyzed and quantum effects discussed in comparison with what has been found with Diffusion Monte Carlo calculations. Further corrections to the classical pic...
Excitation Localization/Delocalization Isomerism in a Strongly Coupled Covalent Dimer of 1,3-Diphenylisobenzofuran
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H. H. Yurtseven, “Raman -spectra pipard relations and critical exponents for NH4CL,”
JOURNAL OF MOLECULAR STRUCTURE
, pp. 173–176, 1984, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51502.