Investigation of the Excitation of the Static GaseousLasers by the Combined Microwave and DC Discharges

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Excitation of Alfvén vortices in the ionosphere by the magnetospheric convection

We analyze conditions for excitation of ULF waves in the ionospheric Alfvén resonator (IAR), taking into account the altitude-inhomogeneous profile of the magnetospheric convection velocity. This profile is formed as a result of interaction of the convective flow with the neutral atmosphere at altitudes 90–150 km. ULF waves comprise oblique Alfvén waves, trapped into the IAR, and ionospheric drift waves, which are in resonance with them. These waves together form strongly anisotropic, closed current loops, whose scale along the magnetic field greatly exceeds their transverse scale, i.e., l_z ≫ l_⊥, and can be considered Alfvén vortices. Within the framework of the proposed model of the ionosphere, we study the instability threshold and the amplitude growth rate of the Alfvén vortices as functions of different parameters (wave vector k_22A5, angle between the wave vector and the convection velocity, ratio of the Alfvén-wave and Pedersen conductivities, etc.). Some estimates are given in application to the observed small-scale field-aligned currents in the auroral ionosphere. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 51, No. 5, pp. 376–390, May 2008.     

Effects of Quantum Interference on the Profile of Excitation Spectra in the Atomic Sodium D_1

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｑｕａｎｔｕｍｉｎｔｅｒｆｅｒｅｎｃｅｒｅｓｕｌｔｓｉｎａｖａｒｉｅｔｙｏｆｎｅｗｅｆｆｅｃｔｓ,ｗｈｉｃｈａｒｅａｔｔｒａｃｔｉｎｇｍｕｃｈｃｕｒｒｅｎｔｉｎｔｅｒｅｓｔｓ .Ｍａｎｙｅｘｐｅｒｉｍｅｎｔａｌａｎｄｔｈｅｏｒｅｔｉｃａｌｉｎｖｅｓｔｉｇａｔｉｏｎｓｈａｖｅｂｅｅｎｄｏｎｅ .Ｆｏｒｅｘａｍｐｌｅ,ｉｎａＶ ｔｙｐｅｓｙｓｔｅｍ ,ｔｈｅｑｕａｎｔｕｍｉｎｔｅｒｆｅｒｅｎｃｅｐｒｏｃｅｓｓｅｓｃａｎｃａｕｓｅｌａｓｉｎｇｗｉｔｈｏｕｔｉｎｖｅｒｓｉｏｎ (ＬＷ…     

Role of the Solid–Aqueous Medium Interface in Transferring Light-Induced Excitation of Silicon

Technical Physics - An effect has been discovered that irradiation of a silicon sample by light changes the properties of another silicon sample several centimeters away from the former. This...     

Excitation Properties of the Biological Neurons with Side-Inhibition Mechanism in Small-World Networks

We have studied the excitation properties of biophysical Hodgkin-Huxley neurons with the side-inhibition mechanism in small-world networks. The result shows that the excitation properties in the networks are preferably consistent with the characteristic properties of a brain neural system under external constant stimuli, such as fatigue effect, extreme excitation principle, and the brain neural excitation response induced by different in- tensity of noise and coupling. The results of the study might shed some light on the study of the brain nerve electrophysiology and epistemological science.     

Excitation of 1+ AND 2− states in the neon isotopes

High resolution inelastic proton scattering is used to study the excitation of 1⁺ states in ²⁰Ne and ²²Ne. By comparing these results with those from gamma-ray fluorescence measurements, the strong role of the orbital contribution in the electromagnetic transitions, predicted by the theory, is confirmed. Shell model predictions of the 1⁺ strength are compared to the measured strength in ²⁰Ne and ²²Ne. The (p, p′) excitation of 2⁻ states in ²⁰Ne is compared to (π⁻, γ) and (e, e′) results.     

Phase Recovery from the Raman Excitation Profile

ＰｈａｓｅＲｅｃｏｖｅｒｙｆｒｏｍｔｈｅＲａｍａｎＥｘｃｉｔａｔｉｏｎＰｒｏｆｉｌｅＳｏｏ－Ｙ．Ｌｅｅ＊ａｎｄＺ．Ｗ．Ｆｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＮａｔｉｏｎａｌＵｎｉｖｅｒｓｉｔｙｏｆＳｉｎｇａｐｏｒｅＫｅｎｔＲｉｄｇｅ...     

Photoionization of Ge^13＋ in the Inner-Shell 2p Excitation Energy Region

The photoionization cross sections of the levels belonging to the ground configuration [Ne]3s^2 3p^6 3d of Ge^13＋ are investigated using the fully relativistic R-matrix method in the 2p - 3d excitation region. The photoionization cross section is dominated by 2p - 3d resonances. The detailed resonance structures are described and analysed with the resonance positions, widths and oscillator strengths to be determined. Good agreement is obtained between the length and velocity forms of the resonance oscillator strengths. The relative difference is less than 8%.     

Dynamical Structure of Nuclear Excitation in Continuum

Dynamical structures of collective excitation in continuum are studied by calculating the isoscalar and isovector strength as well as transition density of nuclei near the drip-line such as ^28O and ^34Ca. It is found that for some excited states in continuum the proton and neutron transition density calculated from isoscalar and isovector excitation at some given energies may be different, which will affect the calculation of the polarization for nuclei with N≠Z.     

Resonance Excitation Rate Coefficient of Ni-Like Tantalum

The ab initio calculations of electron-impact resonant excitation rate coefficients from the ground level to 54 fine-structure levels of 3d94l （1 = s, p, d, f） configurations of Ni-like tantalum ion are performed by using a fully relativistic distorted-wave approximation. The configuration-interaction effects are taken into account. The decays to autoionizing levels possibly followed by autoionization cascades are also included in the calculation. The contributions from doubly-excited intermediate states of Cu-like 31^17n′l′n′l″ （n′ = 4, 5; n″ = 5 - 15） are calculated explicitly, and the contributions from high Rydberg states （n″〉 15） are taken into account by using n-3 scaling law. The present results should be more accurate than the existent calculations.     

Empirical Regularities in the Behavior of the Dissociation Excitation Cross Sections in Collisions of Electrons with Cesium–Halide Molecules

The behavior of the constants A _i. and _i that characterize the dependence of the dissociation excitation cross sections on the main quantum number of the upper energy level is analyzed for spectral series of the cesium atom in collisions of electrons with cesium–halide molecules. In addition to a similarity, some deviations from analogous regularities established previously for the halides of other alkali metals are also found.     

Novel Experimental Method in the Study of Double Rydberg States by Laser Resonance Excitation

1.IntroductionSequentia1multisteplaserexcitationhasbeenextensivelyusedtostudydoublyexcit-edstatesofa1ka1ine-earthatoms.Mostoftheinvestig8tionsconcernedthedoublyexcitedstatesinwhichoneofthetwovalenceelectronsishighlyexcitedandtheotherisweaklyexcited[1].Inthecasewhenbothvalenceelectronarehighlyexcited(doubleRydbergstates),onlyafewresultswereobtainedduetothelimitutioninexPerimentaltech-nique['j.ThelimitationarosefromvariousaSpectS.First,duringthesequentiallaserex-citationofdoubleRydbergstatesw…     

Polarization of Radiation Emitted after Electron Impact Excitation

A programme is developed to calculate the polarizations of the radiation emitted after electron impact excitation. The fully relativistic distorted-wave method is used in cross-section calculations. The programme is applied to He- and Li-like ions. The calculated values of line polarization are compared with other theoretical results and experimental values. For He-like U, at lower incident energy, the present polarization agrees with the other theoretical ones within 1%, while at higher energy, the differences increase up to about 10%. For He-like Fe and Ti, the present results of polarization degree for most of the lines agree with the experimental data within the experimental error bars. For the Li-like Ti line q （ls2s2p^2p3/2 to ls^22s）, the present value of the polarization agree excellently with another theoretical one, and both the values are consistent with the measured data within the experimental error bar.     

Excitation Mechanism of C60^r＋ Ions

Citation of the C60^4 is the same in the two collisions. The strong C peak produced in Ar^ -C60 must be due to the elastic collisions (nuclear stopping), because the Ar is heavy enough to knock out the C^ from C60 molecule. In general, the excitation energy depends on the projectile velocity, charge, and mass. Direct vibronic excitation by elastic collisions (nuclear stopping) is predicted for slow heavy ions, while the electronic excitation (electronic stopping) is dominant for fast ions[1]. For example, Schlatholter, et al.[2] found a strong velocity effect in collisions of He^ with fullerene in the velocity range from 0.1 to 1 a.u. With increasing velocity, the C2 evaporation process decreases and the multi-fragmentation is linearly increasing.     

Kinetics of Photogel Formation in Anthracene‐Containing Copolymers in the Presence of Singlet‐Excitation Energy Acceptors

We suggest a technique to control the rate of photocrosslinking fluorescent polymers by introducing a consumable acceptor of the energy of singlet excitation. We have constructed a model of the processes occurring in a layer of a photocrosslinking anthracenecontaining copolymer with the addition of the acceptor which is spent in the reaction of photooxidation by oxygen of the air and the algorithm for calculating the curves of gel formation in the presence of the acceptor. Comparison of the experimental kinetics of the depletion of the acceptor and accumulation of a gel in a layer with the data of model calculations has proved their good agreement. The possibility of increasing the contrast coefficient of the characteristic curve of negative photoresists on the basis of fluorescent photocrosslinked polymers with the aid of singlet excitation energy acceptors is demonstrated.     

Optical Oscillator Strengths of Hydrogen Bromide in the 4.5-20 eV Excitation Energy Region

The absolute optical oscillator strength density spectrum of HBr in the valence shell energy region of 4.5-20eV has been determined by a high-resolution fast electron energy loss spectrometer. The optical oscillator strengths for the broad a^3∏ A^1∏ dissociation peak and the discrete transitions orb ^3∏1 (v′=0) and C^1∏(v′=0,1,2) are     

Excitation of strontium atom in electron–atom collisions

The excitation of ³D levels of strontium atom by slow monoenergetic electrons has been studied experimentally. Thirty six excitation cross-sections were measured at 30-eV electron energy. Optical excitation functions for most of the transitions were recorded in the 0–200-eV electron-energy range. The excitation cross-section as a function of the principal quantum number has been found to correspond to a power law for all ³D series.     

Hole Transport Properties of MEH-PPV at Different Excitation Wavelengths

Using the time-of-flight photocurrent measurements, we investigate the hole transport properties of polymer 2-methoxy, 5-（2＇-ethyl-hexyloxy）-1, 4-phenylene vinylene （MEH-PPV）. The change of hole transport properties from non-dispersive transport to a dispersive type is presented, with the increasing excitation wavelength near the MEH-PPV absorption edge. At room temperature, the effective mobility of MEH-PPV depends on the applied electric field as commonly seen in some organic materials.     

Effect of Reagent Vibrational and Rotational Excitation on the F＋H2 Reaction： Theoretical Study of the Stereodynamics Using Quasi-Classical Trajectory Method

The vector correlations in the reaction F＋H2 （v =0-3, j =0-3）→ HF（v＇, j＇）＋H are investigated using the quasi- classical trajectory method on the Stark-Werner potential energy surface at a collision energy of 1.0eV. The potential distribution P（θr） to angles between k and j＇, the distribution P（Фr） to dihedral angles, denoting k - k＇ - j＇ correlation and the polarization-dependent generalized differential cross sections, are calculated. The effect of reagent vibrational and rotational excitation on the F＋H2 reaction is discussed in detail The results suggest that the different vibrational and rotational quantum states of H2 have different influences on the product polarization.