Theoretical IR spectral density of H-bond in liquid phase: combined effects of anharmonicities, Fermi resonances, direct and indirect relaxations

N Rekik, N Issaoui, B Oujia, MJ Wójcik - Journal of Molecular Liquids, 2008 - Elsevier
The bandshape of hydrogen bond vibrations in liquids is studied theoretically, taking into
account the anharmonic coupling between the high-frequency stretching vibration, X− H→ …

Theoretical interpretation of the line shape of the gaseous acetic acid cyclic dimer

P Blaise, MJ Wojcik, O Henri-Rousseau - The Journal of chemical …, 2005 - pubs.aip.org
A general quantum theoretical approach of the ν X–H IR line shape of cyclic dimers of
weakly H-bonded species in the gas phase is proposed. In this model, the adiabatic …

A model of phase transitions in double-well Morse potential: Application to hydrogen bond

SV Goryainov - Physica B: Condensed Matter, 2012 - Elsevier
A model of phase transitions in double-well Morse potential is developed. Application of this
model to the hydrogen bond is based on ab initio electron density calculations, which …

IR spectral density of H-bonds. Both intrinsic anharmonicity of the fast mode and the H-bond bridge. Part I: Anharmonic coupling parameter and temperature effects

N Rekik, N Issaoui, H Ghalla, B Oujia… - Journal of Molecular …, 2007 - Elsevier
The paper presents extension of a quantum non-adiabatic treatment of H-bonds in which
effects of anharmonicities of the high frequency XH→⋯ Y and the low frequency X← H⋯ Y→ …

Explaining the structure of the OH stretching band in the IR spectra of strongly hydrogen-bonded dimers of phosphinic acid and their deuterated analogs in the gas …

N Rekik, H Ghalla, G Hanna - The Journal of Physical Chemistry …, 2012 - ACS Publications
We present a simulation of the OH stretching band in the gas-phase IR spectra of strongly
hydrogen-bonded dimers of phosphinic acid and their deuterated analogs [(R2POOH (D) …

Infrared spectral density of H-bonds within the strong anharmonic coupling theory: Indirect relaxation effect

N Rekik, N Issaoui, H Ghalla, B Oujia… - Journal of molecular …, 2007 - Elsevier
The IR spectral density (SD) of the high frequency stretching mode of H-bonded complexes
involving both the intrinsic anharmonicity of the fast and slow mode, together with direct and …

Anharmonic effects on theoretical IR line shapes of medium strong H (D) bonds

N Issaoui, N Rekik, B Oujia… - International Journal of …, 2009 - Wiley Online Library
We extend a quantum nonadiabatic treatment of damped H-bonds involving combined
effects of anharmonicities of both the fast and the slow modes, Fermi resonances and …

Infrared spectral density of hydrogen bonds within the strong anharmonic coupling theory: quadratic dependence of the angular frequency and the equilibrium position …

N Rekik, H Ghalla, N Issaoui, B Oujia… - Journal of Molecular …, 2007 - Elsevier
The paper presents extension of a quantum non-adiabatic treatment of H-bonds involving
intrinsic anharmonicity of the fast mode [Rekik et al. Chem. Phys. 273 (2001) 11] by …

Deciphering the abnormal IR spectral density of phthalic acid dimer crystals: Unveiling the role of the dynamical effects of the Davydov coupling and the mechanisms …

N Rekik - Spectrochimica Acta Part A: Molecular and …, 2025 - Elsevier
To consistently determine the anomalous characteristics of phthalic acid crystal (PAC)
derivatives, we performed quantum dynamics simulations of the infrared spectral density of …

The ν (OH/OD) band shape of strong hydrogen bonded dimers of phosphinic acids. Phenomenology and formation models

RE Asfin, GS Denisov, KG Tokhadze - Journal of molecular structure, 2006 - Elsevier
The infrared spectra of phosphinic acid R2POOH dimers (R= CH3, CH2Cl, C6H5) have
been studied in CCl4 and CH2Cl2 solutions (T= 300K). The infrared spectra of deuterated …