Solar Photovoltaic panels utilization to extract clean and green energy for utility application using PVsyst software: A Bibliometric Review

This paper presents a survey on educational documents in the field of solar photovoltaic (PV) utilization to extract clean and green energy. The main purpose of this bibliometric analysis is to understand the size of the available documents for the research of PV solar panel utilization using PVsyst. This detailed review was conducted in the PV research, literature considering all subjects from the Scopus database. The pattern for the specific arrangement of keywords was separated with the recovered results from the Scopus database, publication type, year of publication, distribution conveyance by nations, subject classes, association, authors, and financing organizations. It was discovered from the close examination that mainly conferences, articles, and review papers from the United States of America, India, and Spain have significant contributions in publication. The time series dataset started in 1999 till date. Major contributions are from the branches of Engineering and Energy, Material Science, Physics, and Astronomy

Practical Phase-Space Electronic Hamiltonians for Ab Initio Dynamics

Modern electronic structure theory is built around the Born-Oppenheimer approximation and the construction of an electronic Hamiltonian H_{el}(X) that depends on the nuclear position X (and not the nuclear momentum P). In this article, using the well-known theory of electron translation (Gamma') and rotational (Gamma'') factors to couple electronic transitions to nuclear motion, we construct a practical phase-space electronic Hamiltonian that depends on both nuclear position and momentum, H_{PS}(X,P). While classical Born-Oppenheimer dynamics that run along the eigensurfaces of the operator H_{el}(X) can recover many nuclear properties correctly, we present some evidence that motion along the eigensurfaces of H_{PS}(X,P) can better capture both nuclear and electronic properties (including the elusive electronic momentum studied by Nafie). Moreover, only the latter (as opposed to the former) conserves the total linear and angular momentum in general

On the short and long phosphorescence lifetimes of aromatic carbonyls

This work uses theoretical and computational methods to investigate the relationship between phosphorescence lifetime and the electronic character of the lowest triplet state of aromatic carbonyls. It shows that phosphorescence is due to a direct spin-orbit coupling (SOC) mechanism modulated by permanent dipoles when the T1 minimum is 3np*. If the minimum is a totally symmetric 3pp*, phosphorescence is due to an indirect SOC mechanism involving transition dipole moments with other excited states. The magnitude difference between permanent and transition dipoles leads to 3np* phosphoresce to be 100 times faster than 3pp*. A vertical approximation and the nuclear ensemble approach (NEA) were tested on benzaldehyde and three derivatives in the gas phase chosen to have both 3np* and 3pp* phosphorescence. Both simulation methods deliver good results for 3n* systems. Nevertheless, vertical simulations fail for 3pp* due to the overwhelming importance of vibronic couplings

On the short and long phosphorescence lifetimes of aromatic carbonyls

International audienceThis work applies theoretical and computational methods to investigate the relationship between phosphorescence lifetime and the electronic character of the lowest triplet state of aromatic carbonyls. A formal analysis of the spin-perturbed wave functions shows that phosphorescence is due to a direct spin-orbit coupling mechanism modulated by permanent dipoles when the T1 minimum is 3 nπ*. If the minimum is a totally symmetric 3 ππ*, phosphorescence is due to an indirect spin-orbit coupling mechanism involving transition dipole moments with other excited states. The magnitude difference between permanent and transition dipoles leads to a much faster 3 nπ* phosphoresce than 3 ππ*. These predictions were verified with phosphorescence lifetime simulations of benzaldehyde and its three derivatives in the gas phase employing a vertical approximation and the nuclear ensemble approaches. Both predict 3 nπ* emission within a few tens of milliseconds. While the vertical approach indicates a 3 ππ* emission within a few seconds, vibronic corrections bring this value down to about 200 ms