共查询到20条相似文献,搜索用时 15 毫秒
1.
A. P. Blinov 《Russian Physics Journal》2006,49(12):1283-1287
2.
S. A. Nemov M. K. Zhitinskaya R. V. Parfen’ev D. V. Shamshur 《Physics of the Solid State》1998,40(7):1096-1097
A study is reported of the effect of low-level germanium additions (∼0.01–0.1 at. %) on the parameters of the superconducting
transition, viz. the critical temperature T
c, the second critical magnetic field H
c2, and
in PbTe doped with 2 at. % Tl, which are derived from the dependence of the electrical resistivity of a sample on temperature
(0.4–4.2 K) and magnetic field (0–1.3 T). The discontinuity revealed by experimental data is related to the onset of a Ge-induced
structural phase transition.
Fiz. Tverd. Tela (St. Petersburg) 40, 1204–1205 (July 1998) 相似文献
3.
4.
A. T. Khalmanov 《Journal of Applied Spectroscopy》2000,67(1):9-13
Multistage effective excitation circuits for a sodium atom in a propane-butane-air flame are studied experimentally. Consideration
is given to the effectiveness of the excitation and ionization of an Au atom following the collision scheme
. Analytical capabilities of the atomizing rod-flame system are demonstrated taking as an example the determination of Au
traces in silver nitrate. The proposed technique of determining Au traces can also be applied to other objects. Variants of
ionization through auto-ionization and Rydberg states of Au are examined.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 1, pp. 11–14, January–February, 2000. 相似文献
5.
C. Chris Wu 《Journal of statistical physics》1996,88(5-6):1399-1408
We consider an inhomogeneous contact process on a tree
of degreek, where the infection rate at any site isλ, the death rate at any site in
isδ (with 0 <δ ⩽ 1) and that at any site in
is 1. Denote by
the critical value for thehomogeneous model (i.e.,δ=1) on
and byϑ(δ, λ) the survival probability of the inhomogeneous model on
. We prove that whenk > 4, if
, a subtree embedded in
, with 1 ⩽σ ⩽ √k, then three existsδ
c
σ
strictly between (
) and 1 such that (
) whenδ >δ
c
σ
andϑ(δ, λ
c(
) > 0 whenδ <δ
c
σ
; ifS={o}, the origin of
, then
for anyδ ε (0, 1). 相似文献
6.
A. V. Mudryi A. V. Ivanyukovich M. V. Yakushev R. Martin A. Saad 《Journal of Applied Spectroscopy》2007,74(3):415-420
The effect of a strong magnetic field (induction up to 10 T) on free and bound excitons in CuInS2 single crystals is studied. A diamagnetic shift to higher energies is observed in the luminescence and reflectance spectra
for free-exciton lines ALPB ≈ 1.5348 eV, AUPB ≈ 1.5361 eV, and BC ≈ 1.557 eV. The diamagnetic shifts of free-exciton lines ALPB, AUPB, and BC provide a basis for estimating the exciton reduced masses
= 0.131m0,
= 0.13 4m0, and μBC = 0.111m0, respectively. Bound-exciton lines in luminescence spectra are split under the influence of the magnetic field. The magnitude
of the Zeeman effect (g-factor of the magnetic splitting) is estimated.
__________
Translated from Zhurnal Prikladnoi Spektroskopii Vol. 74, No. 3, pp. 373–377, May–June, 2007. 相似文献
7.
D. Klabučar 《Physics of Particles and Nuclei》2008,39(7):1186-1186
8.
D. Verney F. Le Blanc L. Cabaret J. Crawford H.T. Duong J. Genevey G. Huber F. Ibrahim M. Krieg J.K.P. Lee D. Lunney J. Obert J. Oms J. Pinard J.C. Putaux B. Roussière J. Sauvage V. Sebastian 《Hyperfine Interactions》2000,127(1-4):79-82
Laser spectroscopy measurements have been performed on neutron deficient iridium isotopes. The hyperfine structure and isotope
shift of the optical Ir I transition 5d76s2
4F9/2 → 5d76s6p 6F11/2 at 351.5 nm have been studied for the 182–189Ir,
and 191,193Ir isotopes. The nuclear magnetic and quadrupole moments were obtained from the HFS measurements and the changes of the mean
square charge radii from the IS measurements. A large mean square charge radius change between 187Ir and 186Ir and between
and
has been observed.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
9.
It is shown that the slope of the upper critical field
in superconductors with d pairing drops rapidly with increasing concentration of normal impurities, while in superconductors with anisotropic s pairing
increases and reaches the well-known asymptotic level characteristic for the isotropic case. This difference makes it possible,
in principle, to employ measurements of H
c
2 in disordered superconductors as an experimental method for determining the type of pairing in high-T
c
superconductors and systems with heavy fermions.
Pis’ma Zh. éksp. Teor. Fiz. 63, No. 5, 347–352 (10 March 1996) 相似文献
10.
G. Abbiendi et al. 《The European Physical Journal C - Particles and Fields》2006,45(2):307-335
The mass and width of the W boson are measured using e+e– → W+W– events from the data sample collected by the OPAL experiment at LEP at centre-of-mass energies between 170 GeV and 209 GeV.
The mass (mW) and width (ΓW) are determined using direct reconstruction of the kinematics of W+W– →
and W+W– →
events. When combined with previous OPAL measurements using W+W– →
events and the dependence on of the WW production cross-section at threshold, the results are determined to be
where the first error is statistical, the second systematic and the third due to uncertainties in the value of the LEP beam
energy. By measuring in the channel using several different determinations of the direction of jets with differing sensitivities
to soft particles, a limit is also obtained on possible final-state interactions due to colour reconnection effects inW+W– →
events. The consistency of the results for the W mass and width with those inferred from other electroweak parameters provides
an important test of the Standard Model of electroweak interactions.
Arrival of the final proofs: 28 November 2005
This paper is dedicated to the memory of Steve O'Neale 相似文献
11.
V. A. Kuz'mitskii 《Journal of Applied Spectroscopy》2005,72(3):360-370
The geometric structure of the chlorin molecule (H2Ch) has been calculated by the restricted and unrestricted Hartree-Fock (RHF and UHF) methods with an AM1 Hamiltonian. Transformations
of this molecule into excited electronic states have been calculated by the CNDO/S method. The RHF method without symmetry
restrictions gives a plane structure for the chlorin macrocycle with an alternation of the lengths of the bonds along the
18-member azacyclopolyene and a C1h symmetry for the molecule as a whole. The level of the first excited state Q1 of this structure is substantially shifted (δ
≅ +4000 cm−1) relative to the Qx level of porphin (H2P) toward shorter waves, which is in contradiction with the experimental data, according to which this shift is long-wave
and is equal to δ
= −400 to −550 cm−1. The optimization of the geometry of H2Ch by the UHF method has shown that it has a structure with an 18-member azacyclopolyene with bonds of equal lengths and a
D2h symmetry. For this geometry of H2Ch the calculated shift of the Qx level, equal to δ
= −70 cm−1, is bathochromic and the position of the Qy level is practically exactly coincident with the experimental one. For the geometry calculated by the RHF method with restrictions
on the D2h symmetry of the 18-member azacyclopolyene δ
= +180 cm−1, and for the geometry calculated with restrictions on the highest C2v symmetry of the H2Ch molecule δ
= +620 cm−1. The latter result shows that the “natural” requirement for the C2v symmetry of the H2Ch macrocycle, which is frequently used in various calculations, is inadequate to achieve a quantitative agreement between
the calculation and experimental data and, in this case, the lengths of the bonds along the 18-member azacyclopolyene are
not equal.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 3, pp. 339–347, May–June, 2005. 相似文献
12.
A. I. Shushin 《Russian Journal of Physical Chemistry B, Focus on Physics》2017,11(6):887-893
The kinetics of fast fluorescence decay in organic semiconductors due to the splitting of the excited singlet state S1 into a pair of triplet (T) excitons is significantly influenced by the process of reverse TT annihilation. It is shown that a correct interpretation of this effect requires taking into account the stochastic migration of T excitons. A two-state model (TSM) is proposed for describing the effect of migration on the kinetics of TT annihilation and, thus, on the kinetics of the fission of the S1 state. In the TSM, the migration effect is interpreted in terms of transitions between the [TT] state of the interacting excitons (at small T?T distances) and the [T + T] state of freely diffusing excitons (at large T?T distances). Within the framework of the TSM, an analytical expression for the fluorescence decay kinetics (FDK) \(I_{S_1 } (t)\) from the S1 state is derived. This expression is used to describe the FDK measured in amorphous rubrene films in the absence of the magnetic field (B = 0) and in the magnetic field B = 8.1 kG. Adjusting the parameters of the model makes it possible to reproduce the experimentally measured FDK with good accuracy. An analysis of the theoretical FDK obtained revealed a significant contribution of T migration to \(I_{S_1 } (t)\), which manifests itself, in particular, in the characteristic dependence \(I_{S_1 } (t) \sim t^{ - 3/2}\) at long times. 相似文献
13.
M. E. Bashtanov N. N. Drozdova A. A. Krasnovskii 《Journal of Applied Spectroscopy》1999,66(4):550-555
The relative intensity of photosensitized phosphorescence of singlet oxygen (1O2) at 1270 nm (L1270) and1O2-induced delayed fluorescence (Ldf) of bacteriopheophytin a (BPh) (770 nm) in air-saturated solutions of BPh in hexafluorobenzene in excitation by 337-nm pulses
of a nitrogen laso is investigated. It is established that Ldf≪L1270. The ratio of the initial intensity of delayed fluorescence and phosphorescence of1O2(Ldf)0/(L1270)0 changed from 0.02 to 0.30 as a function of the energies of laser pulses (2.5–5.0 mJ/cm1) and the BPh concentration (6–18 μM). As the index of quantum efficiency of the delayed fluorescence, the authors used the
coefficient
where [1O2]0 is the initial concentration of1O2 after the laser burst; [Bpn] is the concentration of BPh; kr is the constant of the rate of1O2 radiative deactivation in the solvent under study; γf is the quantum yield of BPh fluorescence. It is established that this
coefficient is smaller by a factor of ∼2000 than in phthalocyanine, while its absolute value is ∼2·1010M−2sec−1. The saturation of BPh solutions with oxygen at atmospheric pressure is shown to lead to a fivefold attenuation of the delayed
fluorescence as compared to air-saturated solutions. The possibility of BPh triplet molecules being involved in the radiation
of delayed fluorescence of the pigment is discussed.
Reported at the VIIIth International Conference on Spectroscopy of Porphyrins and Their Analogs, Minsk, September 22–26, 1998.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 504–508, July–August, 1999. 相似文献
14.
According to the Einstein-Mayer theory of the Riemanniann space-time with Einstein-Cartan teleparallelism, the local Lorentz
invariance is broken by the gravitational field defining Machian reference systems. This breaking of symmetry implies the
occurrence of “hidden matter” in the Einstein equations of gravity. The hidden matter is described by the non-Lorentz-invariant
energy-momentum tensor
satisfying the relation
. The tensor
is formed from the Einstein-Cartan torsion field given by the anholonomy objects, FAik=2hA[i,k], and appears together with Hilbert’s energy-momentum tensor T*
ik and Poincaré’s pressure λgik on the right-hand side of Einstein’s equations so that one has
According to this theory, in the universe and in cosmic systems one must excep “invisible masses” described by the Poincaré
and Einstein-Cartan terms to exist. The torsion field FAik makes the space-time a Machian universe; it is of the same nature as the “weak interacting matter” discussed in astrophysics. 相似文献
15.
O. M. Boyarkin 《Russian Physics Journal》1996,39(6):597-600
The solar neutrino problem is considered within the framework of a model based on the gauge group SU(2)L×SU(2)R×U(1)B−L. An evolutionary equation is found for the eight-component wave function
and a scheme for possible resonant transitions is determined with allowance for the Majorana nature of the neutrino. The
influence of solar flares on the oscillation pattern of the neutrino flux is investigated.
Yankya Kupala State University, Grodno. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 116–120,
June, 1996. 相似文献
16.
P.?Mas?owski K.?Bielska A.?Cygan J.?Domys?awska D.?Lisak R.?Ciury?o A.?Bielski R. S.?Trawiński 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,51(3):295-302
Careful analysis of the intercombination 51S0–53P1 line of the 113Cd isotope with two hfs components
and was carried out.
The hyperfine splitting of this line was determined to uncertainty less than
10-3 cm-1 using neon-perturbed Doppler limited spectra. 相似文献
17.
Explicit evaluation of the following parameters has been carried out in the extraU (1) superstring inspired model: (i) As Mz2 varies from 555 GeV to 620 GeV and (m
t) CDF = 175.6 ± 5.7 GeV (Table 1): (a) SNew varies from -0.100 ± 0.089 to -0.130 ± 0.090, (b) TNew varies from -0.098 ± 0.097 to -0.129 ± 0.098, (c) UNew varies from -0.229 ± 0.177 to -0.253 ± 0.206, (d) Τz varies from 2.487 ± 0.027 to 2.486 ± 0.027, (e) ALR varies from 0.0125 ± 0.0003 to 0.0126 ± 0.0003, (f) A
FB
b
remains constant at 0.0080 ± 0.0007. Almost identical values are obtained for (m
t)D0 = 169 GeV (see table 2). (ii) Triple gauge boson vertices (TGV) contributions: AsMz
2 varies from 555 GeV to 620 GeV and (m
t) CDF = 175.6 ±5.7 GeV. (a)√s = 500 GeV, asymptotic case:
varies from -0.301 to -0.179;
varies from -0.622 to -0.379;
varies from +0.0061 to 0.0056;
varies from -3.691 to -2.186.
varies from +0.270 to +0.118;
varies from +0.552 to 0.238;
varies from +0.0004 to +0.0002;
remains constant at -0.110. (b)√s = 700 GeV, asymptotic case:
varies from -0.297 to -0.176;
varies from -0.609 to -0.370;
varies from -0.0082 to -0.0078;
varies from -3.680 to -2.171.√s = 700 GeV, nonasymptotic case:
varies from -0.173 to -0.299;
varies from-0.343 to -0.591;
varies from -0.005 to -0.011;
remains constant at -0.110.
The pattern of form factors values for√s = 1000, 1200 GeV is almost identical to that of√s= 700 GeV. Further the values of the form factors for (m
t)D0 (=169 GeV) follow identical pattern as that of (m
t) CDF form factors values (see tables 5, 6, 9, 10).
We conclude that the values of all the form factors with the exception of these of
,
are comparable or larger than theS, T values and therefore the TGV contributions are important while deciding the use of extraU (1) model for doing physics beyond standard model. 相似文献
18.
The IR absorption spectra of hydrogenated amorphous films of an a-Si0.60Ge0.40:H solid solution that were obtained by plasmachemical deposition at different partial pressures of hydrogen
have been investigated. The oscillator strengths Γ that depend substantially on
have been determined. It is shown that hydrogen is contained in the films mainly in the GeH and SiH forms. Using integral
absorptions Iw, the concentrations of hydrogen were determined. The highest value of
is observed at Γ = 0.51, P = 4.16, NH = 9.7·1021 cm−3, and CH = 23.7 at.%. It has been established that the oscillator strengths depend on the hydrogen concentration: they decrease on
hydrogen effusion and increase with the hydrogen concentration. It is shown that the hydrogen concentration in the films of
the a-Si0.60Ge0.40:H solid solution can be controlled by changing its pressure.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 3, pp. 371–376, May–June, 2005. 相似文献
19.
As Bleher (J. Stat. Phys. 66(1):315–373, 1992) observed the free flight vector of the planar, infinite horizon, periodic Lorentz process {S n ∣n=0,1,2,…} belongs to the non-standard domain of attraction of the Gaussian law—actually with the $\sqrt{n\log n}As Bleher (J. Stat. Phys. 66(1):315–373, 1992) observed the free flight vector of the planar, infinite horizon, periodic Lorentz process {S
n
∣n=0,1,2,…} belongs to the non-standard domain of attraction of the Gaussian law—actually with the
scaling. Our first aim is to establish his conjecture that, indeed,
converges in distribution to the Gaussian law (a Global Limit Theorem). Here the recent method of Bálint and Gou?zel (Commun.
Math. Phys. 263:461–512, 2006), helped us to essentially simplify the ideas of our earlier sketchy proof (Szász, D., Varjú, T. in Modern dynamical systems
and applications, pp. 433–445, 2004). Moreover, we can also derive (a) the local version of the Global Limit Theorem, (b) the recurrence of the planar, infinite
horizon, periodic Lorentz process, and finally (c) the ergodicity of its infinite invariant measure.
Dedicated to Ya.G. Sinai on the occasion of his seventieth birthday.
Research supported by the Hungarian National Foundation for Scientific Research grants No. T046187, NK 63066 and TS 049835,
further by Hungarian Science and Technology Foundation grant No. A-9/03. 相似文献
20.
D. I. Volkovich V. A. Kuz’mitskii E. A. Makarova P. P. Pershukevich A. N. Sobchuk K. N. Solov’ev I. K. Shushkevich 《Journal of Applied Spectroscopy》2007,74(3):440-453
We have investigated the spectral characteristics, quantum yield ϕF, lifetime τF, and polarization of fluorescence of NH-isomers of dibenzobarrelene disubstituted tetraazaisobacteriochlorin at 293 and 77
K. The following information has been obtained from low-temperature measurements: 1) the weak shoulder on the edge of the
long-wavelength 0-0 absorption band disappears at 77 K and, therefore, can be assigned to the cis-NH-isomer [the principal
component of the tautomeric mixture is the trans-isomer a (b)]; 2) the low value of ϕF at room temperature is due to temperature-viscosity quenching whereas ϕF at 77 K is close to 1 and τF = 5.3 nsec; 3) the energy of the weak electronic transition G → Q2 and the interval
have been determined. Quantum-chemical calculations found that replacing the methine bridges by nitrogen stabilizes the non-aromatic
trans-isomer a (b) whereas the non-planarity of the macrocycle and the alternation of bond lengths increase for the cis-isomers. The calculated
electronic absorption spectra of the a isomer reproduce rather well the experimental data. It is shown that the four-orbital
model is applicable for the lower excited states Q1 and Q2 for all NH-isomers.
__________
Translated from Zhurnal Prikladnoi Spektroskopii Vol. 74, No. 3, pp. 395–407, May–June, 2007. 相似文献