On the “level-shifting” method for converging hartree-fock wave functions

A new formulation of level-shifting method is presented, which provides a more economical procedure for computations.     

Fast ion beams from intense,femtosecond laser irradiated nanostructured surfaces

We present results on hot electron and energetic ion (keV–MeV) generation from polished and nanostructured metallic surfaces excited by p-polarized, femtosecond laser pulses in the intensity range of 1×10¹⁵–1.5×10¹⁷ W cm^-2. A clear enhancement in the hard X-ray spectrum from nanoparticle-coated surfaces is observed, indicating ‘hotter’ electron production in nanoparticle-produced plasma until the intensity of 2×10¹⁶ W cm^-2 is reached. Contrary to the existing perception, we find that the hotter electrons do not lead to hotter ion emission. The total ion flux and the ion energy integrated over the 4–1400 keV energy range are found to be enhanced by 50% and 16%, respectively, for nanostructured targets in comparison to those from polished targets. 55% enhancement in yield is observed for ions at the lower end of the energy range, while hotter ions are actually found to be suppressed by ∼40%. The surface modulations present on the nanoparticle-coated targets are observed to reduce the maximum energy of the ions and showed an intensity-dependent increase in the divergence of the ion beam. PACS 79.20.Ds; 68.47.De; 61.80.Ba; 61.82.Bg; 42.65.Re     

An experimental approach to find aniline-formaldehyde co-polymers as effective inhibitor on the interface of low carbon steel immersed in 0.5N HCl mixtures

The usefulness of aniline formaldehyde (AF), a modern water-soluble composite in 0.5 ?N hydrochloric acid as inhibitor of corrosion for mild steel, has been studied using weight reduction method, test of electrochemical impedance and potentiodynamic polarization methods. According to the findings by weight loss methods, 12ppm of AF co-polymer at room temperature i.e. about 35° ?± ?1°C for 3h duration shows best performance on metal surface and exhibit 93.44% Inhibitor efficiency. The above said results has also being reviled from other examination methods, which shows that the AF follows the Langmuir isotherm, as well as the adsorption properties of the sampling supports the results as maximum IE of 95.05%, using EIS. The tafel and linear polarization results of maximum IE was found to be 94.81% and 94.96% respectively which was well aligned with an atomic force microscope (AFM) for surface morphology and found AF to be best suited corrosion inhibitor showing mixed type of nature, at defined parameters.     

Neutral all metal aromatic half-sandwich complexes between alkaline earth and transition metals: an ab initio exploration

Structural Chemistry - Sandwich complexes find their interests among the chemists after the breakthrough discovery of ferrocene. Since then, a number of sandwich and half-sandwich complexes were...