A novel approach to dimerization is developed, based on a many-body valence-bond approach, that predicts enhancement of the inclusion on-site electron repulsion. Exact numerical calculations are presented substantiate this conclusion.

The interaction of an atomic system with a laser having phase fluctuations is studied within the phase-diffusion model, finite correlation time derivative taken into account. This introduces line shape which Lorentzian near center and falls off faster than at its wings. authors apply this model to calculate spectrum double optical resonance for excitation by non-Lorentzian shape. It observed that reversed peak asymmetry reverts normal far owing cutoff spectrum, in agreement recent...

Abstract Nearly ~ 10 8 types of High entropy alloys (HEAs) can be developed from about 64 elements in the periodic table. A major challenge for materials scientists and metallurgists at this stage is to predict their crystal structure and, therefore, mechanical properties reduce experimental efforts, which are energy time intensive. Through paper, we show that it possible use machine learning (ML) arena phase prediction develop novel HEAs. We tested five robust algorithms namely, K-nearest...

We show that circular dichroism exists in the photoelectron angular distributions from oriented linear molecules electric dipole approximation. Contributions to arise solely interferences between degenerate continua with $m$ values differing by \ifmmode\pm\else\textpm\fi{}1. identify specific photon-propagation, electron-detection configurations where will be observable. Finally, we illustrate magnitude of this effect through ab initio calculations for photoionization out...

In this paper we formulate a theory for the analysis of resonant enhanced multiphoton ionization processes in molecules. Our approach consists viewing (n+m) photon process from an isotropic initial state as m-photon out oriented, excited state. The orientation state, which is reached by n-photon excitation nonisotropic, and characteristic absorption process. simply probes anisotropic population. calculation REMPI thus determining anisotropy created then coupling population to it. While...

A novel real-space approach to dimerization in a half-filled band is developed investigate effects of electron-electron interactions on the Peierls instability. Dimerization shown be result imperfect resonance between pairs electron configurations related each other by mirror-plane symmetry passing through longest diagonal infinite ring, and kinetic- potential-energy contributions barrier are identified separately. The including on-site, nearest-neighbor, next-nearest-neighbor investigated,...

In this paper, we present the theory of photoelectron angular distributions in resonant multiphoton ionization that rigorously takes into account saturation, ac Stark-shift, and laser-linewidth effects. The influence these effects on distribution is incorporated through coupling equations between angle-resolved probabilities (time-dependent) bound-state density-matrix elements. General expressions for are derived several properties arrived at from expressions. Finally, numerical results...

The role of multiplicative colored noise on the photon statistics dye-laser output is investigated. This model explains consistently recent experimental results by Short, Mandel, and Roy.Received 7 February 1983DOI:https://doi.org/10.1103/PhysRevLett.50.1273©1983 American Physical Society

The rotational branching ratios resulting from (1+1) resonant-enhanced multiphoton ionization of NO via the $A^{2}\ensuremath{\Sigma}^{+}$ Rydberg state are analyzed. Theoretical results using ab initio molecular parameters agree reasonably well with recent experimental data. More importantly, analysis underscores importance nature problem and its complexities. It is shown that, for photoionization a $\ensuremath{\Sigma}$ that leaves ion in state, allowed states satisfy selection rule...

Abstract Submerged Arc Additive Manufacturing (SAAM) is an advanced Wire Arc-based (WAAM) technique known for its uniform deposition structure, high rate, and superior surface finish. However, it difficult expensive to experimentally investigate the arc column in SAAM due submerged nature under flux. This paper presents effective alternative: developing a radiation-based analytical model predict complex temperature distribution within column. It focuses on radiation heat transfer phenomenon...

Abstract Refractory High-Entropy Alloys (RHEAs), such as NbMoTaW, MoNbTaVW, HfNbTaZr, Re 0.1 Hf 0.25 NbTaW 0.4 , Nb 40 Ti 25 Al 15 V 10 Ta 5 3 W 2 x NbMoTaW (x = 0, 0.25, 0.5, 0.75 and 1), 3d transition metal HEAs 10.3 Co 17 Cr 7.5 Fe 9 Ni 48.6 5.8 0.6 Mo 0.8 have demonstrated superior performance compared to traditional superalloys, particularly in high-temperature applications for engine components. However, the development of these alloys often depends on critical raw materials (CRMs) Ta,...

Development of microfeatures using laser micromachining is gaining in popularity the automobile, aerospace, medical, and electronics industries due to miniaturization components. Developing such as cooling microholes surface-enhancing micro dimples on titanium alloys a nanosecond pulsed challenging risk thermal metallurgical defects, including recast layer formation, heat-affected zones, microcracks. Despite these challenges, lasers are still preferred over picosecond femtosecond because...

Basalt is a promising rock variant due to its potential in space-biomining, impact cratering, and developing drilling tools. It finds importance Basalt-based composites polymers for automobile defense applications as well. Processing it through conventional processes strenuous high hardness, frictional, corrosion resistance. Laser processing provides various advantages emerges solution. Current work analyses chip stone laser cutting scanning operations with 2.5 kW 100 W CO 2 laser. was...

This study explores the feasibility of utilizing laser technology to cut Muga silk fabric. A 90 W CO 2 machine integrated with CNC system was employed a single layer fabric approximately 0.25 mm thickness. Laser power varied from 10 increments 20 W, and cutting speed 50 mm/s 350 75 mm/s. The results revealed that at low not successfully achieved, but higher settings allowed for successful cutting, clear indication extreme blackening increased overcutting. Desirability function analysis (DFA)...