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Көрінетін элементтер 1-20 из 213

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1D states of the beryllium atom: Quantum mechanical nonrelativistic calculations employing explicitly correlated Gaussian functions

Sharkey, Keeper L.; Bubin, Sergiy; Adamowicz, Ludwik (2011)

Very accurate finite-nuclear-mass variational nonrelativistic calculations are performed for the lowest five 1D states (1s2 2p2, 1s2 2s1 3d1, 1s2 2s1 4d1, 1s2 2s1 5d1, and 1s2 2s1 6d1) of the beryllium atom (9Be). The wave ...
Accuracy limits on the description of the lowest S excitation in the Li atom using explicitly correlated Gaussian basis functions

Stanke, Monika; Komasa, Jacek; Kedziera, Dariusz; Bubin, Sergiy; Adamowicz, Ludwik (2008)

We have performed very accurate quantum-mechanical calculations for the two lowest S states of the lithium atom in order to determine the transition energy. In the nonrelativistic part of the calculations performed ...
Accurate non-Born-Oppenheimer calculations of the complete pure vibrational spectrum of D2 with including relativistic corrections

Bubin, Sergiy; Stanke, Monika; Adamowicz, Ludwik (2011)

In this work we report very accurate variational calculations of the complete pure vibrational spectrum of the D2 molecule performed within the framework where the Born-Oppenheimer (BO) approximation is not assumed. After ...
Accurate non-Born-Oppenheimer calculations of the complete pure vibrational spectrum of ditritium using all-particle explicitly correlated Gaussian functions

Bubin, Sergiy; Stanke, Monika; Adamowicz, Ludwik (2014)

Very accurate variational calculations of the complete pure vibrational spectrum of the ditritium (T2) molecule are performed within the framework where the Born-Oppenheimer approximation is not assumed. After separating ...
Accurate variational calculations of the ground 2Po(1s22s22p) and excited 2S(1s22s2p2) and 2Po(1s22s23p) states of singly ionized carbon atom

Bubin, Sergiy; Adamowicz, Ludwik (2011)

In this article we report accurate nonrelativistic variational calculations of the ground and two excited states of C+ ion. We employ extended and well optimized basis sets of all-electron explicitly correlated Gaussians ...
Achieving Anomalous Refraction with Metasurfaces Composed by Two Ordinary Dielectric Materials

Tsitsas, N. L.; Valagiannopoulos, Constantinos (Metamaterials, 2018)

The optimal parameters of a dielectric metasurface, composed of two alternating rectangular rods, are investigated so that it exhibits significant enhancement in the −1- diffracted order in the transmission region. An ...
Aharonov-Bohm detection of two-dimensional magnetostatic cloaks

Valagiannopoulos, Constantinos; Askarpour, Amir Nader; Al`, Andrea (2015)

Two-dimensionalmagnetostatic cloaks, evenwhen perfectly designed tomitigate the magnetic field disturbance of a scatterer, may be still detectable with Aharonov-Bohm (AB) measurements, and therefore may affect quantum ...
Algorithm for quantum-mechanical finite-nuclear-mass variational calculations of atoms with two p electrons using all-electron explicitly correlated Gaussian basis functions

Sharkey, Keeper L.; Pavanello, Michele; Bubin, Sergiy; Adamowicz, Ludwik (2009)

A new algorithm for calculating the Hamiltonian matrix elements with all-electron explicitly correlated Gaussian functions for quantum-mechanical calculations of atoms with two p electrons or a single d electron have ...
All black holes in Lemaˆıtre-Tolman-Bondi inhomogeneous dust collapse

Joshi, Pankaj S.; Malafarina, D. (2015-09-08)

Within the Lemaˆıtre-Tolman-Bondi formalism for gravitational collapse of inhomogeneous dust we analyze the parameter space that leads to the formation of a globally covered singularity (i.e. a black hole) when some ...
An accurate non-Born–Oppenheimer calculation of the first purely vibrational transition in LiH molecule

Bubin, Sergiy; Adamowicz, Ludwik; Molski, Marcin (2005)

In this work we study the ground and the first vibrationally excited states of LiH molecule. We performed an extensive nonrelativistic variational calculations of the two states without using the Born–Oppenheimer approximation. ...
An algorithm for calculating atomic D states with explicitly correlated Gaussian functions

Sharkey, Keeper L.; Bubin, Sergiy; Adamowicz, Ludwik (2011)

An algorithm for the variational calculation of atomic D states employing n-electron explicitly correlated Gaussians is developed and implemented. The algorithm includes formulas for the first derivatives of the Hamiltonian ...
ANALOG PARTICLE PRODUCTION MODEL FOR GENERAL CLASSES OF TAUB-NUT BLACK HOLES

Foo, Joshua; Good, Michael R. R.; Mann, Robert B. (Universe, 2021-09-20)

We derive a correspondence between the Hawking radiation spectra emitted from general classes of Taub-NUT black holes with that induced by the relativistic motion of an accelerated Dirichlet boundary condition (i.e., a ...
Analytical energy gradient in variational calculations of the two lowest 3P states of the carbon atom with explicitly correlated Gaussian basis functions

Sharkey, Keeper L.; Bubin, Sergiy; Adamowicz, Ludwik (2010)

Variational calculations of ground and excited bound states on atomic and molecular systems performed with basis functions that explicitly depend on the interparticle distances can generate very accurate results provided ...
Analytical investigations of ground modifications assisting the detection of buried object

Valagiannopoulos, Constantinos; Tsitsas, Nikolaos L.; Sihvola, Ari H. (Nazarbayev University School of Science and Technology, 2016-08-18)

A ground-penetrating radar (GPR) antenna excites a perfectly electric conducting inclusion buried inside the ground. The scattering problem is solved semi-analytically via integral equation techniques. The permittivity and ...
Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Tsitsas, Nikolaos L.; Valagiannopoulos, Constantinos (Journal of the Optical Society of America B, 2017-03-15)

Plane wave scattering by a planar metasurface composed of two periodically alternating rectangular dielectric rods is considered. A rigorous integral equation methodology is employed for the analysis and the accurate ...
A note on the definition of deformed exponential and logarithm functions

Oikonomou, Th.; Baris Bagci, G. (2009)

The recent generalizations of the Boltzmann–Gibbs statistics mathematically rely on the deformed logarithmic and exponential functions defined through some deformation parameters. In the present work, we investigate whether ...
Are Black Holes Springy?

Good, Michael R.R.; Ong, Yen Chin (2014)

A (3+1)-dimensional asymptotically at Kerr black hole angular speed + can be used to de ne an e ective spring constant, k = m2 +. Its maximum value is the Schwarzschild surface gravity, k = , which rapidly weakens as ...
Assessing performance of modern Brillouin spectrometers

Coker, Zachary; Troyanova‐Wood, Maria; Traverso, Andrew J.; Yakupov, Talgat; Utegulov, Zhandos; Yakovlev, Vladislav V. (Optics Express, 2018-02)

Brillouin spectroscopy and imaging has experienced a renaissance in recent years seeing vast improvements in methodology and increasing number of applications. With this resurgence has come the development of new spontaneous ...
Assessment of the accuracy the experimental energies of the 1Po 1s22s6p and 1s22s7p states of 9Be based on variational calculations with explicitly correlated Gaussians

Bubin, Sergiy; Adamowicz, Ludwik (2012)

Benchmark variational calculations are performed for the six lowest states of the 1Po 1s22snp state series of the 9Be atom. The wave functions of the states are expanded in terms of all-particle, explicitly correlated ...
Band structure of cavity-type hypersonic phononic crystals fabricated by femtosecond laser-induced two-photon polymerization

Rakhymzhanov, A. M.; Gueddida, A.; Alonso-Redondo, E.; Utegulov, Zhandos; Perevoznik, D.; Kurselis, K.; Chichkov, B. N.; El Boudouti, E. H.; Djafari-Rouhani, B.; Fytas, G. (Applied Physics Letters, 2016-05)

The phononic band diagram of a periodic square structure fabricated by femtosecond laser pulseinduced two photon polymerization is recorded by Brillouin light scattering (BLS) at hypersonic (GHz) frequencies and computed ...