Search

The electron binding energy spectrum and outer valence orbital momentum densities of chlorotrifluoromethane have been measured by binary (e, 2e) electron momentum spectroscopy. Impact energy of 1200 eV plus binding energy and symmetric non-coplanar geometry are employed. The experimental momentum profiles of different orbitals are compared with Hartree-Fock and density functional theory calculations using different-sized basis sets. The result shows that the calculated momentum distributions for some of the outer valence orbitals largely depend on the calculation method and the size of basis sets.

Cai, Liu, and Luo developed a vortex stability theory (J. of Fluid Mech., vol. 480, 2003, pp. 65-94) for slender conical bodies and predicted that vortices over a at-plate delta wing at high angles of attack with zero sideslip were conical, symmetric, and stable but adding a low dorsal n to the wing would destabilize the vortices and therefore render the originally symmetric vortices asymmetric. The wing is assumed slender so that no vortex breakdown occurs on the wing. An experimental study using a six-component internal strain-gage balance is conducted to verify the validity of the theoretical predictions and shows the force development versus angle of attack. A sharp-edged at-plate delta wing of 82:5 sweep angle is tested in a low-speed wind tunnel at angles of attack up to 32 and sideslip within 10 . The same tests are performed on an identical delta wing model but with a low dorsal n mounted vertically in the incidence plane of the wing. Two n heights are tested. The ratios of the local n height to the local wing semi-span are 0:3 and 0:6. The measurement of the aerodynamic forces and moments clearly indicates that a force-asymmetry onset occurs over the wing-n models at zero sideslip, providing for the rst time force measurement evidence of the theoretical predictions and depicts that the force-asymmetry onset can be followed by a force-unsteadiness onset.

Within the framework of the first-order Born approximation, the triple differential cross sections (TDCSs) for simultaneous ionization and excitation of helium are calculated. The wave function of the ejected electron is chosen to be orthogonal or non-orthogonal to the wave function of the bound electron before ionization. It is found that the orthogonality has a strong effect on the TDCS, especially when plane waves and Coulomb waves are used to describe the projectile and the ejected electron.

The entropy evolution of the field interacting with two entangled-atoms are studied by means of quantum theory.Using the numerical method,the influence of the entanglement of atoms and the intensity of field on the entropy evolution of the field is discussed. The results show that the entanglement of atoms affects the mean-value of field entropy and the intensity of field affects the oscillation properties of field entropy evolution.

A closed solution of the Schrdinger equation for a timedependent two coupled harmonic oscillators including a driving part and a twomode coupled part is derived by adopting the LewisRiesenfeld invariant theory and properly chosen Hermitian invariant operators. The evolution operator of the system and the condition for generating twomode squeezed states are obtained. It is shown that the quantum fluctuation of squeezed states of the system is independent of the driving part, but depends on the initial states of the system.

The evolution properties of the entropy of a single-mode light field interacting with the V-type three-level atom via intensity-dependent coupling have been studied. The discussion is centered on the influence of detuning and initial photon number on the field entropy evolution. The results show that the behavi or of the field entropy is non-periodic for the cases of small detuning and weak initial light field,being similar to the single-photon Jaynes-Cummings model (JCM). On the contrary,the field entropy evolution is periodic for the cases of large detuning or strong initial light field,being similar to the two-photon JCM

In this paper, the quantum properties of light in a system of two coupling atoms interacting with a single-model squeezed vacuum field at the two-photon transition in Kerr medium are studied by means of quantum theory.The influences of the Kerr medium and the dipole-dipole interaction between atoms are discussed. The results show that when the Kerr effect and the dipole-dipole interaction between atoms may be neglected, the fluctuation of U2 can be squeezed periodically. With increasing the Kerr effect and the dipole-dipole interaction between atoms, the squeezing effect of light gradually becomes weak and the squeezing time of light gradually decreases. The periodical collapse-revival phenomenon of the time evolution of the second-order coherence degree of the field appears, which is caused by the influence of the Kerr effect and the dipole-dipole interaction between atoms. No matter how large are the coupling constants, the photon bunching always appears.

The statistic properties of photons in the system of two-mode squeezing vacuum field interacting with two coupling atoms in Kerr medium are studied by means of quantum theory.The influences of coupling constant χ, initial squeezed parameter r and the atomic initial state are discussed. The results obtained by means of numerical method show that the photon bunching and anti-bunching appear alternately, and the correlation of the two modes of light is both positive and non-classical. The periodical collapse-revival phenomenon of the time evolution of the second-order coherence degree of the two-mode field appears due to the influence of the Kerr effect. The periods of the collapse-revival become short up to disappearance with increasing Kerr effect.

The influence of the interaction between atoms in Bose-Einstein condensate (BEC) on the squeezing properties of atomic lasers is studied under Bogoliubov approximation. The results show that the fluctuations of two quadrature components of the atomic laser can be squeezed and the interaction between atoms in BEC is disadvantageous to the squeeze of atomic lasers.

The Hamiltonian operator of a system of single-mode light field interacting with Bose-Einstein condensate(BEC) of two-level atoms is suggested within the rotati ng-wave approximation. The influence of the interaction between atoms in the BEC on the quadrature squeezing properties of single-mode squeezed light interactin g with atomic BEC is studied under Bogoliubov approximation. The results show th at the fluctuations of two quadrature components of light evolve periodically in a cosine law and their squeezing properties are determined mainly by the initia l squeeze factor and squeeze direction angle of light, and that the interaction between atoms in BEC changes the amplitude and period of fluctuation of light.

The statistic properties of photons in a system of two-mode squeezed vacuum field interacting with a two-level atom are studied without the rotating-wave approximation by means of quantum theory, and the influence of the virtual-photon process on the statistic properties of photons is discussed emphatically. The results obtained using a numerical method indicate that the influence of the virtual-photon process on the statistic properties of photons qives rise to quantum chaos, that is related to the initial state parameters of the system.

The squeezing and coherence properties of the light produced by the Raman interaction of single-mode squeezed vacuum field with two coupling atoms are studied by means of quantum theory. Using the numerical method, the relation between the quantum properties of the light and the coupling parameter and initial state of the system is discussed.

The dynamical properties of two coupled-atoms Raman-interacting with a single-mode squeezed vacuum field are studied by means of quantum theory.Using the numerical method,the relation between the quantum properties of the atoms and the coupling parameter and initial state of the system is discussed.

The mathematical formulas of the conservation law in the double-wave quantnm theory are studied.As an example,the constants of motion and their classical limits of a 3-dimensional isotropic harmonic oscillator are discussed.The results indicate that the conservation law of the double-wave quantnm theory is applicable to single particle systems,and the conservation law of the usual quantnm theory is applicable only to statistical ensembles.

The squeezing and coherence properties of the light in the system of two-mode squeezing vacuum field interacting with two coupling-atoms are studied in the framework of quantum theory.The relation between the quantum properties of the light and the characteristics of the system itself is discussed.

We have investigated in the time-evolution and the squeezing character of atomic operators in a system of two-mode squeezed vacuum field interacting with a two-level atom without the rotating-wave approximation by means of quantum theory.The results obtained using the numerical method indicate that the influence of the virtual-photon field on the atomic quantum character is mainly the cause for quantum chaos which is related to the quantum character of the system itself.