共查询到20条相似文献,搜索用时 15 毫秒
1.
V. I. Gael' 《Journal of Applied Spectroscopy》2004,71(3):350-358
Quantum-chemical calculations of magnesium complexes of porphin (D
4h
, C
4v
) and bacteriochlorin (D
2h
, C
2v
) have been carried out for three variants of Mg parameters used in the CNDO/S method. It is shown that the Mg parameters and z
Mg weakly influence the results of the calculations of these complexes in the excited S
i
states localized on the macrocycles in contrast to the calculations for the S
i
CT states. The G S
i
CT transitions are transitions with intramolecular electron transfer (CT) from the macrocycles to Mg. The energies of the S
i
CT states can be close to the energies of the B levels and differ by a value from 1600 to 6400 cm–1 depending on the Mg parameters. A displacement of Mg (z
Mg) 0) from the midplane of the macrocycles and hydrogenation of the pyrrole rings decrease the energies of the lower G S
i
CT transitions and enhance their CT character. 相似文献
2.
3.
Two new types of quantum states are constructed by applying the operator s(ξ) = exp(ξ*ab - ξa b ) on the two-mode even and odd coherent states.The mathematical and quantum statistical properties of such states are investigated.Various nonclassical features of these states,such as squeezing properties,the inter-mode photon bunching,and the violation of Cauchy-Schwarz inequality,are discussed.The Wigner function in these states are studied in detail. 相似文献
4.
激发奇偶q相干态的统计性质 总被引:8,自引:0,他引:8
构造了激发奇q相干态a+mqα〉oq和激发偶q相干态a+mqα〉eq,并通过数值计算研究了参数q和m对平均光子数、亚泊松特性和反聚束效应等统计性质的影响.结果表明:当q偏离1较远时,二阶q相干函数出现振荡现象,其振幅和周期与m无关;平均光子数和MandelQq参数都随着m的增大而急剧增大;只要不是q→1,亚泊松特性和反聚束效应两者是不等价的. 相似文献
5.
A quantum-chemical calculation of the prodan molecule and its complexes in water for the geometry of the ground and fluorescent
states is carried out. To describe the fluorescent state, changes in the electronic state (population) on bonds and atoms
during transition of the molecule into an excited state are taken into account. A model of interaction of the prodan molecule
with a polar proton-donor solvent (water) is suggested. It is shown that interaction with the ionic forms (H3O+ provides an explanation for the sensitivity of prodan to the solvent (displacement of the fluorescence bands). The nature
of the electronic excited states of the prodan molecule and its complexes has been investigated. The constants of the rates
of radiative and nonradiative processes and the fluorescence quantum yields have been calculated.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 3, pp. 330–334, May–June, 2005. 相似文献
6.
7.
ZHAN You-Bang ZHOU Ping FU Hao 《理论物理通讯》2004,42(12)
Dynamic evolution of a mesoscopic Josephson junction (M J J) interacting with excited even and odd coherent states is studied. It is shown that the supercurrent in MJJ exhibits both collapse and revival (CR) phenomenon and squeezing effect. It is also shown that the CR and squeezing of supercurrent are related to degree of excitation and average photon number. 相似文献
8.
ZHANYou-Bang ZHOUPing FUHao 《理论物理通讯》2004,42(6):932-936
Dynamic evolution of a mesoscopic Josephson junction (MJJ) interacting with excited even and odd coherent states is studied. It is shown that the supercurrent in MJJ exhibits both collapse and revival (CR) phenomenon and squeezing effect. It is also shown that the CR and squeezing of supercurrent are related to degree of excitation and average photon number. 相似文献
9.
激发双参数变形奇偶相干态的反聚束效应 总被引:3,自引:0,他引:3
通过在双参数变形奇偶qs相干态上重复作用玻色产生算符,构造了激发奇qs相干态aqs+m|α〉qso和激发偶qs相干态aqs+m|α〉qse,并用数值计算研究了参数m,s和q对反聚束效应的影响.结果显示:(1)当r较小时,对于偶qs相干态,激发可使原来强烈的聚束效应变为强烈的反聚束效应;(2)当q(q≤1)偏离1较远时,随着r2的增大,二阶qs相关函数出现振荡现象(即反聚束效应和聚束效应交替出现),其振幅和周期都随s和q的减小而增大,但不明显受m的调节;(3)当q→1时,二阶相关函数同样出现振荡现象,其振幅和周期不但随着s的减小而增大,而且明显地受到参数m的调节;(4)对于大多数r,二阶qs相关函数对s的敏感度大于对q的敏感度. 相似文献
10.
We consider a fixed quantum measurement performed over n identical copies of quantum states. Using a rigorous notion of distinguishability based on Shannon’s 12th theorem, we show that in the case of a single qubit, the number of distinguishable states is
, where (α1,α2) is the angle interval from which the states are chosen. In the general case of an N-dimensional Hilbert space and an area Ω of the domain on the unit sphere from which the states are chosen, the number of distinguishable states is
. The optimal distribution is uniform over the domain in Cartesian coordinates. 相似文献
11.
12.
激发纠缠相干态的统计性质 总被引:3,自引:0,他引:3
将玻色湮灭算符的逆算符作用在纠缠相干态的一个模上得到激发纠缠相干态.该量子态是玻色湮灭算符的偶次幂本征态;由于两个场模间的纠缠,在a模上增加光子不但可以使a模的平均光子数增加,也可以使b模的平均光子数发生变化;当a模上增加光子后,两个场模的亚泊松分布特性和Cauchy-Schwartz不等式的破坏都得到了增强,但模间反关联度反而减弱. 相似文献
13.
14.
偶奇qs相干态的非经典特性 总被引:7,自引:1,他引:6
利用数值计算方法研究了q和s畸变对双参数形变偶奇qs相干态量子统计特性的委现偶奇qs相干态与通常的偶奇相干态有着显著不同的量子统计性质,压缩效应和反聚束效应均可在一定条件下的两种双参数畸变态中出现,偶奇qs相干态和通常偶奇相干态的差异随q值偏离1越大和s的取值越小而越大。 相似文献
15.
BAO Chengguang 《理论物理通讯》1998,29(4):491-496
A set of equations are deduced from a consideration of symmetry to pick out states with specific geometric structure. Then the quadruply excited intrashell states are classified according to their geometric feature. 相似文献
16.
Alastair Brodlie 《International Journal of Theoretical Physics》2003,42(8):1707-1731
p-Mechanics is a consistent physical theory which describes both quantum and classical mechanics simultaneously (V. V. Kisil, p-Mechanics as a physical theory. An Introduction, E-print:arXiv:quant-ph/0212101, 2002; International Journal of Theoretical Physics
41(1), 63–77, 2002). We continue the development of p-mechanics by introducing the concept of states. The set of coherent states we introduce allows us to evaluate classical observables at any point of phase space and simultaneously to evaluate quantum probability amplitudes. The example of the forced harmonic oscillator is used to demonstrate these concepts. 相似文献
17.
18.
The basic methods that have been used for describing bound-state quantum electrodynamics are described and critically discussed. These include the external field approximation, the quasi-potential approaches, the effective potential approach, the Bethe–Salpeter method, and the three-dimensional equations of Lepage and other workers. Other methods less frequently used but of some intrinsic interest such as applications of the Duffin–Kemmer equation are also described. A comparison of the strengths and shortcomings of these various approaches is included. 相似文献
19.
Mohammad Javad Faghihi 《Annalen der Physik》2020,532(12):2000215
In this paper, by making use of the nonlinear coherent states approach, the generalized photon added and subtracted f-deformed displaced Fock states are introduced. In other words, a natural link between photon added and subtracted displaced Fock states and nonlinear coherent states associated with nonlinear oscillator algebra is obtained. It is found that various kinds of nonclassical states can be generated by adopting appropriately controlling parameters in both linear and nonlinear regimes. Moreover, examining some of the most nonclassical properties such as Mandel's Q parameter, different types of squeezing, namely, quadrature, amplitude–squared and phase entropic squeezing, and Vogel's characteristic function, the nonclassicality features of the considered quantum states of interest are studied. Furthermore, to obtain the degree of quantum coherence, the relative entropy of coherence is investigated. Indeed, the nonclassicality aspects of the states obtained have been numerically studied to understand the roles of deformation functions, photons added and subtracted, and photon number occupied in the Fock state on physical properties. It is demonstrated that the depth and the domain of the nonclassicality features of the system can properly be controlled by selecting the suitable parameters. 相似文献
20.