We used a diffusion Monte Carlo technique to describe the properties of fully heavy compact arrangements (no dibaryon molecules) including six quarks and no antiquarks within framework constituent quark model. Only whose wavefunctions were eigenvectors ${L}^{2}$ with eigenvalue $\ensuremath{\ell}=0$ taken into account, what means that we only considered subset all possible color-spin combinations make total antisymmetric respect interchange any two same type. In cases, masses six-quark are...

The properties of fully heavy arrangements including a number quarks between 5 and 12 were calculated within the framework constituent quark model by using diffusion Monte Carlo technique. We considered only clusters in which all had same mass whose particles antiparticles adequate to produce color singlets. All multiquarks their lowest possible values ${L}^{2}$ ${S}^{2}$ operators. Thus, we color-spin wave functions that antisymmetric with respect interchange any two type. found both...

Dirichlet boundary conditions with different symmetries, spherical and cylindrical impenetrable surfaces, are imposed on the covalent electron pair of a molecular bond. Accurate results for observable like energy interparticle distances calculated using quantum Monte Carlo methods beyond Born-Oppenheimer approximation. The confinement induces raise in bond shortens internuclear even relatively soft confinement. When symmetry is considered, similar qualitative behavior observed though only...

A model of confinement the covalent bond by a finite potential beyond Born-Oppenheimer approximation is presented. two-electron molecule located at center penetrable spherical cavity. The Schrödinger equation has been solved using diffusion Monte Carlo method. Total energies, internuclear distances, and vibrational frequencies confined molecular system have obtained. Even for confining potentials few electronvolts, noticeable increase in energy nuclear frequency observed, distance lowered....

Using a diffusion Monte Carlo algorithm, we calculated the spectra of all possible <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>S</a:mi></a:math>-wave fully heavy pentaquarks within framework quark model. Our aim was to compare masses different spin-color configurations corresponding same spatial wave function for each composition. In particular, computed configuration with maximum number undistinguishable quarks and those <c:math...

Abstract The ground state energy of a helium atom inside spherical multilayer quantum dot as function the atomic impurity location has been calculated. is modeled by core/shell/well/shell structure using parabolic confinement. Configuration Interaction method and Diffusion Monte Carlo have used to solve Schrödinger equation. Results obtained showed that lowest configuration depends on size different layers agreement between results indicates approach here would be suitable compute excited...

Abstract The problem of the stability a confined atom when it is extracted from confining cavity has been investigated, modeled by spherical hard wall potential. ionization probability released confinement obtained. dependence on radius and quantum numbers initial state studied. density function energy ejected electron obtained for different cases considered. oscillatory structure this distribution function, with principal maximum located in neighborhood minima very close to zero elucidated....

The problem of the stability hydrogen atom when it is released from a confining environment studied. analysed in terms excitation and ionisation probabilities final state for different initial states. A spherical cavity finite barrier height v0 with inner radius r0 thickness Δ nuclear position at its centre has been considered. probability presents sharply peaked, non-symmetric local maxima as function confinement size. This behaviour related to energy confined that several minima kink-like...

The changes in the covalent bond of hydrogen molecule limited space by a spherical hard boundary are studied. sphere is moved along an axis parallel or orthogonal to molecular axis. diffusion Monte Carlo approach used solve Schrödinger equation with relevant conditions and evaluate energy versus location sphere. vertical lateral quantum forces exerted on evaluated calculating derivative distances results show that present important dependence distance vanish rapidly as separation between...

In this study, we address the problem of a C60 endohedrally confined hydrogen molecule through configuration-interaction approach to electronic dynamics. Modeling confinement by means combination two Woods-Saxon potentials, analyze stability system as function nuclei position behavior spectrum. After studying convergence different partial wave expansions, one related molecular Coulomb centers and other off-centering well, found that second provides more accurate description system....

Using a diffusion Monte Carlo algorithm, we calculated the spectra of all possible $S$-wave fully heavy pentaquarks within framework quark model. Our aim was to compare masses different spin-color configurations corresponding same spatial wavefunction for each composition. In particular, computed configuration with maximum number undistinguishable quarks and those baryon+meson splittings compatible total $b$'s $c$'s given pentaquark. What found that, in cases, compact had lower than their...

Laboratory plasmas can be characterized by Optical Emission Spectroscopy techniques using Hydrogen Balmer series lines. The line shape is the result of convolution several internal process occuring in plasma. Stark effect over emitter atom has been studied a limited range plasma parameters, obtaining profile which sum given number Lorentzian functions for Hα and Hβ line. In this paper, we have extended analysis to cover wide conditions depends on contribution ion collisions around their...

Abstract In this work we studied the problem of stability confined atoms when they are released from confinement. We analyzed Hydrogen atom inside a cage modelled by square-well potential, in particular effects size on energy and electronic structure atom, considering different internal radii confining cage. Starting wave function, clarified effect probability transition between states, characterized term both, ionization to bound state free atom. The values atomic properties calculated...