A graphic method of Drude equation was applied to a series of aldonic acid 1,4-lactones 1-7 to investigate possible Cotton effects below 200nm. The calculation shows three bands at 220nm, 170 nm and 130 nm to reflect the stereochemistries at C-2, C-4 and rtng conformations and vicinal OH at C-3 and C-4, respectively. The sum of the rotational contributions at 589 nm of these bands explained the...

We study in detail the optical forces generated by a plasmonic trap on a plasmonic nanoparticle. The permittivity of the trapped particle is tuned using a Drude model. The interplay between the plasmon resonances of the trap and of the particle can produce different regimes leading to attractive or repulsive forces. Hence a particle will be trapped or repulsed depending on its permittivity. Suc...

We analytically investigate the forces due to Surface Plasmon Polariton (SPP) modes between finite and infinitely thick metal slabs separated by an air gap. Using the Drude model and experimentally determined values of the dielectric functions of gold and silver, we study how frequency dispersion and loss in the metals affects the behavior of the SPP modes and the forces generated by them. We c...

We propose a nonperturbative quantum dissipation theory, in term of hierarchical quantum master equation, which may be used with a great degree of confidence to various dynamics systems in condensed phases. The theoretical development is rooted in an improved semiclassical treatment of Drude bath, beyond the conventional high temperature approximations. It leads to the new theory a simple but i...

Friction is a desired property in quantum dynamics as it allows for localization, prevents backscattering, and is essential in the description of multistage transfer. Practical approaches for friction generally involve memory functionals or interactions with system baths. Here, we start by requiring that a friction term will always reduce the energy of the system; we show that this is automatic...

A classical electrodynamic near field calculation for the interaction of a Drude oscillator molecular dipole with a rough metal surface is presented. Effects of electromagnetic coupling between surface bumps (assumed to be prolate hemispheroids) and the bulk metal are included. Fluorescence lifetimes are found to be two to four orders of magnitude smaller than those predicted for a flat plane i...

The infrared reflectivity of a La0.67Ca0.33MnO3 single crystal is studied over a broad range of temperatures ~78–340 K!, magnetic fields ~0–16 T!, and wave numbers (20– 9000 cm). The optical conductivity gradually changes from a Drude-like behavior to a broad peak feature near 5000 cm in the ferromagnetic state below the Curie temperature TC5307 K. Various features of the optical conductivity b...

We report on the first Raman data of Cu substituted La1−ySryMn1−xCuxO3 (0 ≤ x ≤ 0.10 and 0.17 ≤ y ≤ 0.3, accordingly in order to have the same Mn/[Mn+Mn] ratio), collected in the frequency range 100-900 cm and at room temperature, with parallel (ei ‖ es) and crossed (ei ⊥ es) polarizations of the incident (ei) and scattered (es) light. Spectra were fitted with a Drude-Lorentz model, and peaks a...

We report the use of infrared reflectance spectroscopy to examine the electronic structure of epitaxial, sputter deposited thin films of the predicted half-metallic ferromagnet NiMnSb. The contribution of the interband transitions to the optical conductivity, as well as the spectral weight of conducting carriers, agree with the band structure calculations predicting a half-metallic state in NiM...

We report the frequency-dependent conductivity of the manganite system La1−xSrxMnO3 (x ≤ 0.2) when approaching the metal-insulator transition from the insulating side. Results from low-frequency dielectric measurements are combined with spectra in the infrared region. For low doping levels the behavior is dominated by hopping transport of localized charge carriers at low frequencies and by phon...