Transient optical properties of coherent four-level atoms without undepleted ground-state approximation

2007 ◽  
Vol 368 (3-4) ◽  
pp. 336-340 ◽  
Author(s):  
Hui-jun Li ◽  
Chao Hang ◽  
Guoxiang Huang
Keyword(s):  
Optical Properties ◽  
Ground State ◽  
State Approximation

Ground-state geometries and optical properties ofNa8−xLix(x=0–8)clusters

2002 ◽  
Vol 65 (5) ◽  
Author(s):  
M. D. Deshpande ◽  
D. G. Kanhere ◽  
P. V. Panat ◽  
Igor Vasiliev ◽  
Richard M. Martin
Keyword(s):  
Optical Properties ◽  
Ground State

scholarly journals Ab-initio study of electronic and magneto-optical properties of InAs:Mn

2018 ◽  
Vol 185 ◽  
pp. 06008 ◽  
Author(s):  
Elena Gan’shina ◽  
Erkin Kulatov ◽  
Leonard Golik ◽  
Zoya Kun’kova ◽  
Yurii Uspenskii ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ground State ◽  
Kerr Effect ◽  
Energy Difference ◽  
Dielectric Tensor ◽  
Ab Initio Study ◽  
State Distribution ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra ◽  
Good Agreement

Energy difference between the ferromagnetic and antiferromagnetic collinear orderings has been calculated for the uniform and dimer Mn-pair geometries in order to find the ground state distribution of the Mn atoms in InAs host. We find the preference of the dimer ferromagnetic configuration of Mn dopants and an importance of optimizing the atomic site positions. The frequency-dependent optical and magneto-optical properties, namely the dielectric tensor (on-and off-diagonal components), the electron energy loss spectra, and the transversal Kerr effect (TKE), are calculated. Calculated TKE resonance in In1-xMnxAs (x=0.0625) is found to be in good agreement with corresponding experimental magneto-optical spectra. The origin of the large TKE is discussed.

Calculated ground state, optical and magneto-optical properties of uranium sulphide

1995 ◽  
Vol 56 (11) ◽  
pp. 1491-1497 ◽  
Author(s):  
M.S.S. Brooks ◽  
T. Gasche ◽  
B. Johansson
Keyword(s):  
Optical Properties ◽  
Ground State

Formation of antihydrogen in the ground state

2007 ◽  
Vol 85 (4) ◽  
pp. 393-399
Author(s):  
V S Kulhar
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Time Reversal ◽  
Exchange Process ◽  
Hydrogen Charge ◽  
High Energy ◽  
High Energy Region ◽  
Charge Exchange Process ◽  
State Approximation ◽  
Reversal Invariance

Cross sections for antihydrogen formation in the ground state for the process [Formula: see text] + Ps(nlm) → [Formula: see text](1s) + e– have been calculated using charge conjugation and time reversal invariance. Calculations are based on a two-state approximation method, used by the author earlier for positron–hydrogen charge -exchange process (e+ – H → Ps(nlm) + p). Cross-section results are reported in the intermediate- and high-energy region (20 keV – 500 keV). PACS No.: 36.10.Dr

A Study of the Physical and Optical Properties of Ho3+ in Soda-Lime-Silicate Glass Systems

2013 ◽  
Vol 770 ◽  
pp. 140-144 ◽  
Author(s):  
Parnuwat Chimalawong ◽  
Jakrapong Kaewkhao ◽  
Keerati Kirdsiri ◽  
Pichet Limsuwan
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Silicate Glass ◽  
Ground State ◽  
Glass Matrix ◽  
Soda Lime ◽  
Silicate Glasses ◽  
Melt Quenching ◽  
Light Amber ◽  
Soda Lime Silicate Glass

Soda-lime-silicate glasses in the compositions of (65-x)SiO2-25Na2O-10CaO-xHo2O3 (where x = 0.0, 0.50, 1.00, 1.50, 2.00 and 2.50 mol % ) were prepared by melt-quenching technique and characterized. The results show that, the absorption spectra of Ho3+ doped in soda-lime-silicate glass correspond with several bands, which are assigned from the ground state, 5I8 to 3H6 (360 nm), 5G4 (380 nm), 5G5 (417 nm), 5G6 (453 nm), 5F3 (479 nm), 5F4 (538 nm), 5F5 (639 nm), and 5I5 (880 nm). The refractive index and density of glasses were increase with increasing of Ho2O3 concentration. The color of glass samples is light amber with doped Ho2O3 in glass matrix.

scholarly journals Electronic and Optical Properties of SiGe alloys within first-principles schemes

2004 ◽  
Vol 829 ◽  
Author(s):  
G. Cappellini ◽  
G. Satta ◽  
M. Palummo ◽  
G. Onida
Keyword(s):  
Optical Properties ◽  
Ground State ◽  
First Principles ◽  
Theoretical Data ◽  
Electronic Excitations ◽  
Electronic And Optical Properties ◽  
Type Lattice ◽  
Diamond Type

ABSTRACTWe present first-principles calculated electronic and optical properties of some SiGe alloys. The ground-state, electronic excitations and optical properties have been calculated with Ge and Si atoms arranged in different ways among the sites of a diamond-type lattice. For the ground state a DFT-LDA scheme and for the electronic excitations a DFT-GW approach have been respectively used. For the optical properties the DFT-LDA-RPA scheme has been applied for alloys going in composition from Si(100%) to Ge(100%): obtained results have been compared with existing experimental and theoretical data. For the noticeable Si(50%)Ge(50%) alloy also two-particle effects have been evaluated using the Bethe-Salpeter equation.

Excited states of positronium in positron–hydrogen charge exchange

1978 ◽  
Vol 56 (5) ◽  
pp. 565-570 ◽  
Author(s):  
V. S. Kulhar ◽  
C. S. Shastry
Keyword(s):  
Excited States ◽  
Charge Exchange ◽  
Cross Sections ◽  
Ground State ◽  
Born Approximation ◽  
Energy Region ◽  
Hydrogen Charge ◽  
Positronium Formation ◽  
State Approximation ◽  
Higher Excited States

The two state approximation method for the study of the rearrangement collisions is applied to the process of positronium formation in excited states for positron–hydrogen charge exchange collisions. Differential and integrated cross sections are computed for positronium formation in 2S, 2P, and 3S excited states. The results obtained in the energy region 2 to 10 Ry are compared with positronium formation cross sections in ground state. Total positronium formation cross sections including the contributions of capture into all the higher excited states of positronium are also computed in the first Born approximation and the two state approximation in the energy region considered.

Nonlinear Optical Properties of Tetrabenzporphyrins

1994 ◽  
Vol 374 ◽  
Author(s):  
Gary L. Wood ◽  
Andrew G. Mott ◽  
Mary J. Miller ◽  
Masato Nakashima ◽  
Joseph F. Roach
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Ground State ◽  
Nonlinear Optical ◽  
Laser Light ◽  
Nonlinear Refraction ◽  
Nonlinear Behavior ◽  
Population Redistribution ◽  
Optical Focusing ◽  
532 Nm

AbstractOptical limiting in a solution of tetrabenzporphyrin (TBP) dissolved in tetrahydrofuran (THF) was measured in an f/5 optical focusing arrangement using 532 nm wavelength laser light with a 9 ns pulse duration. The performance of this solution was compared to a variety of other materials. In order to better understand the nonlinear behavior of this material, apertured and unapertured Z-scans were performed. From these measurements it was determined that the excited-state cross section and its ratio to ground-state cross section were large. The nonlinear refraction of this material is made up of contributions from thermal density change and population redistribution. Limiter performance was modeled in an f/64 limiter. The limiter behavior of a slightly modified compound and an additional solvent were measured.

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