CONTENTS Introduction Ultraviolet and Visible Spectroscopy Nature of Electronic Transitions Principles of Absorption Spectroscopy Spectral Measurements Solvent Effects Applications of Electron Spectroscopy Commercial Applications of UV and Visible Spectroscopy Infrared Absorption Spectroscopy Hooke’s law and Absorption of Radiations Modes of Molecular Vibrations Other Factors influencing Vibrat...

Air Pollution has always been a major problem in metropolises. Volatile organic compounds are one of the major pollutants that are caused by incomplete combustion of fuels in vehicles and gasoline evaporation, especially in fueling stations. Removing these pollutants through traditional methods has always been considered. The paper investigates and studies chemical adsorption behavior of benzen...

Based on the quantum transport equation for the electron-phonon system, the absorption coefficient of sound (acoustic phonons) by absorption of laser radiation in cylindrical quantum wires is calculated for the case of monophoton absorption and the case of multiphoton absorption. Analytical expressions and conditions for the absorption of sound are obtained. Differences between the two cases of...

Enhancement of the Raman scattering and IR absorption activities due to the electron-attachment was investigated for water systems by DFT calculations. DFT calculation of a 6-ring water cluster system that included the diffusive nature of electrons well reproduced the Raman enhancement effects and Raman shifts of the OH stretching modes observed in experiments. Based on the same model and calcu...

Driven by the search for new materials with interesting and unique properties and also by the fundamental question of how atomic and molecular physical behaviour develops with increasing size, the ® eld of nanoparticle research has grown immensely in the last two decades. Partially for these reasons, colloidal solutionsof metallic (especially silver and gold) nanoparticles have long fascinated ...

The development of non-fullerene small molecule as electron acceptors is critical for overcoming the shortcomings of fullerene and its derivatives (such as limited absorption of light, poor morphological stability and high cost). We investigated the electronic and optical properties of the two selected promising non-fullerene acceptors (NFAs), IDIC and IDTBR, and five conjugated donor polymers ...

Experimental investigation of electron-ion coupling and electron heat capacity of copper in warm and dense states are presented. From time-resolved x-ray absorption spectroscopy, the temporal evolution of electron temperature is obtained for non-equilibrium warm dense copper heated by an intense femtosecond laser pulse. Electron heat capacity and electron-ion coupling are inferred from the init...

When low-energy excess electrons are UIJeCted. tnto a polar fhud [ I,?] , they become raprdly thermahzed. These thermahzed electrons are butrally locahzed m shallow potentral wells formed by the surroundmg solvent molecules. They are called trapped electrons, et, and are charactertzed by absorption spectra with ma+ ma in the mfrared, a narrow ESR hne, and a sudden drop m mobihty. In the absence...

A tight binding parameterization of the band structure, along with a mean field treatment of Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict striking change with temperature in the functional form and magnitude of the optical absorption. Comparison of our results to data will deter...

Electrons and protons accelerated and trapped in a Saturnian magnetic field have been found by the University of Chicago experiments on Pioneer 11 within 20 Saturn radii (Rs) of the planet. In the innermost regions, strong absorption effects due to satellites and ring material were observed, and from approximately 4 Rs inwards to the outer edge of the A ring at 2.30 Rs (where the radiation is a...