Showing papers by "Ljupčo Pejov published in 1999"
TL;DR: In this paper, room and low temperature IR spectra of the sulphate doped Rb 2 SeO 4 and Cs 2 Se O 4 were recorded and the positions of the ν 3 and ν 4 fundamental mode components of the dopant anions, as well as of the ǫ 1 mode were precisely measured.
18 citations
TL;DR: In this paper, the anharmonicity constants and harmonic eigenvalues of the O-H and O-D stretching vibrations were calculated for several members of the isomorphous series of metal(II) saccharinates hexahydrates (those of Cr, Mn, Fe, Co, Ni, Cu, Zn and Cd), on the basis of the experimentally obtained (by FTIR spectroscopy) frequencies of isotopically isolated OH and OD species.
9 citations
Journal Article•
7 citations
TL;DR: In this article, a perturbation theoretical method is proposed that allows determination of the function describing the dependence of the intramolecular XH(D) potential on the hydrogen bond strength.
Abstract: A perturbation theoretical method is proposed that allows determination of the function describing the dependence of the intramolecular XH(D) potential on the hydrogen bond strength Treating the XH(D) oscillators as mixed cubic–quartic oscillators in which the stretch–stretch couplings of the ν(X–H(D)) mode with the internal modes of the radical X may be neglected, and introducing the hydrogen bonding influence through the changes in the harmonic diagonal force constants (as proposed by Sceats and Rice [41]), it is possible to extract the analytical form of the function
$$k_{rr} = f\left( {R_{X \ldots Y} } \right)$$
) from the experimental
$$\tilde v_{XH(D)} $$
versus
$$R_{X \ldots Y} $$
correlations The other parameters obtained by the empirical correlations, within this model, also have an exact physical meaning The method is applicable to weak hydrogen bonds as well as to hydrogen bonds of intermediate strength, and, strictly speaking, to linear X–
$$X - H(D) \ldots Y$$
systems However, extension to arbitrary geometry may be easily done
3 citations
TL;DR: In this article, a monocrystal of sucrose, cooled to the boiling temperature of liquid nitrogen and then left at ambient temperature, shows a pyroelectric effect that is very clearly manifested through the growth of ice crystals in the direction of the induced electric field lines of force.
Abstract: A monocrystal of sucrose, cooled to the boiling temperature of liquid nitrogen and then left at ambient temperature, shows a pyroelectric effect that is very clearly manifested through the growth of ice crystals in the direction of the induced electric field lines of force.
1 citations