共查询到20条相似文献,搜索用时 31 毫秒
1.
A. V. Glushkov A. F. Kivganov V. N. Khokhlov T. V. Buyadzhi L. A. Vitavetskaya V. P. Borovskaya V. N. Polishchuk 《Russian Physics Journal》1998,41(3):223-226
The interatomic potentials in a system formed by an ion of an inert gas in the ground state and an atom of an inert gas (e.g.,
Ne+, Ar+-Ne, Ar, Kr, Xe) are calculated on the basis of a calculation of the most important polarization diagrams of perturbation
theory in the Thomas-Fermi approximation. The calculation employs the effective pseudopotential method using a new form of
the polarization interaction potential. Results are presented from a calculation of the quasimolecular terms of particular
van der Waals systems that improve existing data; some of the data were obtained in earlier studies.
Odessa Hydrometeorological Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 36–40, March,
1998. 相似文献
2.
S. V. Malinovskaya S. V. Dan’kov A. I. Drozdov A. F. Kivganov A. N. Polevoi V. N. Khokhlov 《Journal of Applied Spectroscopy》1998,65(6):984-987
Based on the effective-pneudopotential method with the use of a new form of the polarization-interaction potential, obtained
on the basis of calculating the most important polarization diagrams of the perturbation theory in the Thomas—Fermi approximation,
the authors calculated interatomic potentials in the inert-gas ion in the ground state-inert-gas atom system: Ne+, Kr+−Ne, Ar, Kr, Xe. The results of calculating on its basis quasi-molecular terms of the sought van der Waals systems that refine
the available data are given; a part of the results is obtained for the first time.
Odessa Hydrometeorological Institute, 15, L’vovskaya St., Odessa, 270016, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 65, No. 6, pp. 935–938, November–December, 1998. 相似文献
3.
The mass spectra of the residual gas in a metallic vacuum chamber of capacity 3 l are studied with an MI-9303 high-resolution
magnetic resonance mass spectrometer in the mass range 1–140 u. The experiments are carried out under four evacuation conditions
in the pressure range P = 10−8–10−10 Torr, and almost all the mass peaks forming multiplets are resolved. It is shown that the multiplets with mass numbers M≤80 have, as a rule, a multicomponent structure and hydrogen is the basic component responsible for the total pressure in
the chamber irrespective of evacuation conditions. Next in order of intensity in the mass spectra are, CH
4
+
, H2O+, CO+, and CO
2
+
peaks. Other lines in the residual gas spectra are largely due to various C-, H-, N-, and O-based compounds. In addition,
the background mass spectrum involves Cl-and F-based compounds and noble gas isotopes. The multiplets with M > 80 often degenerate into a single hydrocarbon line. 相似文献
4.
A. M. Orlov I. O. Yavtushenko M. V. Churilov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(5):831-835
The adsorption and kinetic processes of the formation of gas bubbles passivating the surface during polarization of copper
and graphite electrodes in 1% aqueous solution of sulfuric acid have been investigated. Three stages of the process related
to the recharging of the double electric layer—adsorption accumulation of the gas escaping from the surface, the critical
nucleation of the gas bubbles, and their subsequent growth—have been revealed, distinguished, and quantitatively estimated.
It has been shown that potential leveling at the steady-state value specified by the Tafel equation is unambiguously associated
with achievement of the limiting surface area screened by the gas bubbles for each particular current density. The surface
diffusion constants D
H = (1.5–4.4) × 10−4 and (0.1–3.8) × 10−5 cm2/s of hydrogen on copper and graphite, respectively, and D
O = (1.8–4.5) × 10−7 cm2/s of oxygen on graphite during the motion toward the drain (the gas bubbles) have been calculated. 相似文献
5.
M. N. Achasov A. V. Bozhenok A. D. Bukin D. A. Bukin S. V. Burdin T. V. Dimova S. I. Dolinsky V. P. Druzhinin M. S. Dubrovin I. A. Gaponenko V. B. Golubev V. N. Ivanchenko A. A. Korol S. V. Koshuba A. P. Lysenko E. V. Pakhtusova V. V. Shary Yu. M. Shatunov V. A. Sidorov Z. K. Silagadze S. I. Serednyakov A. A. Valishev Yu. V. Usov 《JETP Letters》1998,67(10):777-780
Results from the Spherical Nonmagnetic Detector (SND) on Δ(1232) isobar electroproduction in the collisions of beam electrons
(positrons) and residual gas nuclei in the VEPP-2M e
+
e
− collider are presented. On the basis of the data obtained the expected counting rate of this process in future high-luminosity
e
+
e
− colliders (φ, c-τ, and b factories) is estimated.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 10, 737–740 (25 May 1998)
Published in English in the original Russian journal. Edited by Steve Torstveit. 相似文献
6.
N. N. Loshkareva Yu. P. Sukhorukov B. A. Gizhevskii S. V. Naumov A. A. Samokhvalov A. S. Moskvin T. A. Belykh 《Physics of the Solid State》1998,40(3):383-388
Irradiation of various single-crystal CuO faces [ac,bc,(110)] with 4.6-MeV He+ ions has been found to result in reduction of CuO to Cu2O and Cu on the irradiated and unirradiated sides, lifting of forbiddenness from optical transitions in the [CuO4]7− electron center in the 0.7–0.95-eV energy range, a change in dichroism near the bands corresponding to transitions in the
hole centers, [CuO4]5−, and electron centers, [CuO4]7−, as well as in a resonant increase of absorption at 0.95–1.30 eV with an unusual polarization dependence. The results of
He+ irradiation of CuO single crystals are discussed in terms of a model of the nucleation of the phase of polar (electron and
hole) centers in copper-oxygen systems.
Fiz. Tverd. Tela (St. Petersburg) 40, 419–424 (March 1998) 相似文献
7.
Lizhu Tong 《Central European Journal of Physics》2012,10(4):888-897
The effect of gas flow in low pressure inductively coupled Ar/N2 plasmas operating at the rf frequency of 13.56 MHz and the total gas pressure of 20 mTorr is studied at the gas flows of 5–700 sccm by coupling the plasma simulation with the calculation of flow dynamics. The gas temperature is 300 K and input power is 300 W. The Ar fractions are varied from 0% to 95%. The species taken into account include electrons, Ar atoms and their excited levels, N2 molecules and their seven different excited levels, N atoms, and Ar+, N+, N2 +, N4 + ions. 51 chemical reactions are considered. It is found that the electron densities increase and electron temperatures decrease with a rise in gas flow rate for the different Ar fractions. The densities of all the plasma species for the different Ar fractions and gas flow rates are obtained. The collisional power losses in plasma discharges are presented and the effect of gas flow is investigated. 相似文献
8.
V.D. Efros H. Oberhummer A. Pushkin I.J. Thompson 《The European Physical Journal A - Hadrons and Nuclei》1998,1(4):447-453
A semi–microscopic model for the low–energy photodisintegration of the 9Be nucleus is constructed, and the experimental data are analyzed with its help. The older radioactive isotope data are supported
by this analysis. The theoretical photodisintegration cross section is derived. The astrophysical rates for the reaction α+α+n→9Be+γ and the reverse photodisintegration of 9Be are calculated. The new reaction rate for α+α+n→9Be+γ is compared with previous estimations.
Received: 19 January 1998 相似文献
9.
The interatomic potentials in a system consisting of a halogen atom in the ground state and an inert gas atom are calculated
by the effective pseudopotential method with a new form of the polarization interaction potential found by calculating the
most important polarization diagrams of perturbation theory in the Thomas-Fermi approximation. The results of these calculations
of the quasi-molecular terms of this van der Waals system refine available data; some are obtained for the first time. The
available experimental and theoretical data are compared.
Odessa Hydrometeorological Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 71–75, October,
1996. 相似文献
10.
U. O. Yilmaz 《The European Physical Journal C - Particles and Fields》2008,58(4):555-568
The rare B
s
→φ
ℓ
+
ℓ
−decay is investigated by using the most general model-independent effective Hamiltonian for ℓ=μ,τ. The calculated value of Br(B
s
→φ
μ
+
μ
−)=1.92×10−6 is consistent with the experimental upper bound. The dependencies of the branching ratios and polarization asymmetries of
leptons and combined lepton–antilepton asymmetries on the new Wilson coefficients are presented. The analysis shows that the
branching ratios and the lepton-polarization asymmetries are very sensitive to scalar- and tensor-type interactions. The results
obtained in this work will be very useful in searching new physics beyond the standard model. 相似文献
11.
V. A. Kartoshkin 《Optics and Spectroscopy》2010,109(5):674-679
Complex cross sections of the spin exchange are calculated for the first time for interacting Na and K atoms based on the
data on the singlet (X
1Σ+) and triplet (a
3Σ+) potentials that describe the interaction of these alkali-metal atoms in the ground state. The obtained cross sections allow
one to theoretically consider the polarization transfer processes and calculate the relaxation times and the magnetic resonance
frequency shifts caused by Na-K spin-exchange collisions. 相似文献
12.
V. A. Kartoshkin 《Optics and Spectroscopy》2011,110(5):665-671
The interaction of alkali K and Rb atoms that reside in the ground state is considered in the range of collision energies
E = 10−4 to 10−2 au. The singlet (X
1Σ+) and triplet (a
3Σ+) interaction potentials available in the literature are analyzed and modified. For the KRb dimer in the range of interatomic
distances 15–21a
0, we chose analytical representations of the singlet and triplet potentials that more accurately describe the interaction
of alkali Rb and K atoms in the ground state. Complex cross sections of the spin exchange are calculated for the first time
that permit one to calculate the processes of polarization transfer and relaxation times, as well as shifts in the magnetic
resonance frequencies caused by K-Rb spin exchange collisions. 相似文献
13.
Antonio O. Bouzas 《The European Physical Journal A - Hadrons and Nuclei》2008,37(2):201-216
We compute the polarization of the final-state baryon, in its rest frame, in low-energy mesonbaryon scattering with unpolarized
initial state, in unitarized BChPT. Free parameters are determined by fitting total and differential cross-section data (and
spin-asymmetry or polarization data if available) for pK
−, pK
+ and pπ+ scattering. We also compare our results with those of leading-order BChPT. 相似文献
14.
The energy level structure of F
3
+
laser color centers in crystals of LiF is discussed. A high-power laser (λ
ex=920 nm) is used to excite luminescence from LiF crystals with F
3
+
centers via two-photon absorption, and the dependence of the polarization and intensity of this luminescence on the polarization
of the laser light is measured and calculated. It is shown that the two-photon transition involves the excitation of a previously
unknown state of the F
3
+
center—a spin singlet whose wave function has 1
A
1 symmetry.
Fiz. Tverd. Tela (St. Petersburg) 39, 1373–1379 (August 1996) 相似文献
15.
The inclusive K
+ meson production in proton–nucleus collisions in the near threshold and subthreshold energy regimes is analyzed with respect
to the one–step (pN→K
+
YN, Y=Λ,Σ) and two–step (pN→NNπ, NN2π; πN→K
+
Y) incoherent production processes on the basis of an appropriate new folding model, which takes properly into account the
struck target nucleon removal energy and momentum distribution (nucleon spectral function), extracted from recent quasielastic
electron scattering experiments and from many–body calculations with realistic models of the NN interaction. Comparison of the model calculations of the K
+ total and double differential cross sections for the reaction p+C
12 with the existing experimental data is given, illustrating both the relative role of the primary and secondary production
channels at considered incident energies and those features of the cross sections which are sensitive to the high momentum
and high removal energy part of the nucleon spectral function that is governed by nucleon–nucleon short–range and tensor correlations.
It is found that the in–medium modifications of the available for pion and kaon production invariant energies squared due
to the respective optical potentials are needed to account for considered experimental data.
Received: 2 April 1997 / Revised version: 7 August 1997 相似文献
16.
The interatomic potentials in a system of an excited Na or K atom and an inert gas atom are calculated on the basis of the
effective pseudopotential method, using a new form of the polarization interaction potential obtained by calculating the most
important polarization diagrams of perturbation theory in the Thomas-Fermi approximation. The results of a calculation, on
its basis, of the intermolecular terms of this van der Waals system are given, refining the existing data; some of the results
have been obtained for the first time. A comparison is made with the available experimental and theoretical data.
Odessa Hydrometeorological Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 32–35, September,
1996. 相似文献
17.
Jianbo Lu Yuanxing Gui Li xin Xu 《The European Physical Journal C - Particles and Fields》2009,63(3):349-354
We investigate observational constraints on the generalized Chaplygin gas (GCG) model as the unification of dark matter and
dark energy from the latest observational data: the Union SNe Ia data, the observational Hubble data, the SDSS baryon acoustic
peak and the five-year WMAP shift parameter. The result is obtained that the best-fit values of the GCG model parameters with
their confidence level are A
s=0.73−0.06+0.06 (1σ) −0.09+0.09 (2σ), α=−0.09−0.12+0.15 (1σ) −0.19+0.26 (2σ). Furthermore, in this model, we can see that the evolution of equation of state (EOS) for dark energy is similar to quiessence,
and its current best-fit value is w
0de=−0.96 with the 1σ confidence level −0.91≥w
0de≥−1.00. 相似文献
18.
E.Ya. Paryev 《The European Physical Journal A - Hadrons and Nuclei》2000,7(1):127-137
The inclusive K+ meson production in photon–induced reactions in the near threshold and subthreshold energy regimes is analyzed with respect
to the one–step (γN→K
+
Y, Y=Λ,Σ) incoherent production processes on the basis of an appropriate new folding model, which takes properly into account
the struck target nucleon removal energy and internal momentum distribution (nucleon spectral function), extracted from recent
quasielastic electron scattering experiments and from many–body calculations with realistic models of the NN interaction.
Simple parametrizations for the total and differential cross sections of the K+ production in photon–nucleon collisions are presented. Comparison of the model calculations of the K+ differential cross sections for the reaction γ+C12 in the threshold region with the existing experimental data is given, that displays the contributions to the K+ production at considered incident energies coming from the use of the single–particle part as well as high momentum and high
removal energy part of the nucleon spectral function. Detailed predictions for the K+ total and differential cross sections from γH2, γC12 and γPb208 reactions at subthreshold and near threshold energies are provided. The influence of the uncertainties in the elementary
K+ production cross sections on the K+ yield is explored.
Received: 12 April 1999 / Revised version: 11 September 1999 相似文献
19.
L. I. Galanina N. S. Zelenskaya V. M. Lebedev N. V. Orlova A. V. Spassky 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(4):422-424
Experimental and calculated angular dependences of the tensor polarization components of 24Mg(2+, 1.369 MeV) and 28Si(2+, 1.78 MeV) nuclei produced in inelastic scattering of α particles are presented. Tensor polarization is reconstructed on
the basis of previously obtained spin-tensors of the density matrix of these nuclei. Experimental results are compared using
the coupled channel method. It is demonstrated that the experimental angular dependences of components of tensor polarization
are similar for the studied nuclei. 相似文献
20.
A. D. Smirnov 《Optics and Spectroscopy》2007,102(1):18-22
The vibrational, rotational, and centrifugal distortion constants have been calculated for the electronic states A
1Σ
u
+
, B
1Πu, C
1Πu, D
1Σ
u
+
, and E
1Σ
u
+
of the Cs2 molecule. The calculation was performed on the basis of the semiempirical potential energy curves constructed in this paper.
The calculated spectroscopic constants are compared with the experimental data.
Original Russian Text ? A.D. Smirnov, 2007, published in Optika i Spektroskopiya, 2007, Vol. 102, No. 1, pp. 23–27. 相似文献