Due to a beneficial balance of computational cost and accuracy, real-time time-dependent density-functional theory has emerged as promising first-principles framework describe electron dynamics. Here we discuss recent implementations around this approach, in particular the context complex, extended systems. Results include an analysis associated with numerical propagation when using absorbing b...

The density functional theory (DFT) has become the workhorse in electronic structure calculations. Its success derives from the ability to produce accurate results with reasonable computational effort. The drawback of the DFT is that in principle it is bound to the ground-state properties. However, the time-dependent DFT (TDDFT) extends the applicatibility of the DFT to excited states. In recen...

We show that the analytic structure of dynamical exchange-correlation (xc) kernels semiconductors and insulators can be sensed in terms its poles, which mark physically relevant frequencies system where counterphase motion discrete collective excitations occurs: If excited, modes counterbalance each other, making exhibit none at all or extremely weak density response. This property employed to ...

A transição eletrônica n * do formaldeído em água é analisada usando-se um procedimento combinado e seqüencial de Monte Carlo (MC) clássico e mecânica quântica (MQ). MC é usado para gerar configurações do líquido para uso posterior em cálculos de MQ. Usando-se a representação espectral da teoria do funcional da densidade com uma base de funções gaussianas localizadas (TD-DFT/6-311++G(d,p)) cálc...

In this chapter, we review the recent new developments in time-dependent density functional (TDDFT) methods for treatment of dynamics of many-electron molecules in intense laser fields. We discuss some recent development of TDDFT with optimized effective potential (OEP) and self-interaction-correction (SIC) for many-electron systems which allows the use of orbital-independent single-particle lo...

objective(s): adsorption of immucillin-a (bcx4430) molecule on the pristine and n-doped tio2 anatase nanoparticles were studied using the density functional theory (dft) calculations. the adsorption energy analysis indicated that tio2+immucillin-a complexes including oc-substituted tio2 have higher adsorption energy than the complexes with ot substituted tio2, thus providing more stable configu...

we have performed density functional theory investigations on the adsorption properties of ammonia molecule on the undoped and n-doped tio2 anatase nanoparticles. we have geometrically optimized the constructed undoped and n-doped nanoparticles in order to fully understand the adsorption behaviors of ammonia molecule. for tio2 anatase nanoparticles, the binding site is preferentially located on...

Dynamical correlations in the homogeneous electron gas are a central issue in time-dependent density functional theory and are investigated here by evaluating exactly the leading corrections to the RPA proper polarizability. We obtain Im e(k ,v) at arbitrary k and v outside the ~single! particle-hole excitation spectrum. We calculate the imaginary part of the local field factor Im G(k ,v) and c...