Advances in Quantum Chemistry publishes articles and invited experiences by way of major overseas researchers in quantum chemistry. Quantum chemistry offers really with the digital constitution of atoms, molecules, and crystalline subject and describes it when it comes to electron wave styles. It makes use of actual and chemical perception, refined arithmetic and high-speed desktops to resolve the wave equations and attain its effects. Advances highlights those very important, interdisciplinary advancements.

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Methods, 2002, B195, 91; A. F. Lifschitz and N. R. Arista, Phys. Rev. A, 1998, 57, 200; J. E. Valdes, P. Vargas and N. R. Arista, Phys. Rev. A, 1997, 56, 4781. [15] I. Campillo, J. M. Pitarke and A. G. Eguiluz, Phys. Rev. B, 1998, 58, 10307. [16] J. J. Dorado and F. Flores, Phys. Rev. A, 1993, 47, 3092. [17] P. M. Echenique, R. M. Nieminem and R. H. , 1981, 37, 779; P. M. Echenique, R. M. Nieminem, J. C. Ashley and R. H. Ritchie, Phys. Rev. A, 1986, 33, 897. [18] N. Bohr, Phil. , 1913, 25, 10; N.

One may see that the electron density moves towards the projectile. The opposite effect takes place for the negatively charged particle (antiproton). Second, for protons at the distance of closest approach, the maximum of the electron-density points to the backward direction at an angle of about 1208 with respect to the beam axis. It is clearly visible that the electron density lies behind the projectile, although the proton is attracting the electron. The reason for this behavior is a delayed response of the electron cloud (the inertia due to the electron mass).

Schiwietz move in the field of a transient ‘quasidipole’ formed by the heavy particles. The electronic states of the quasidipole experience a rapid loss of binding energy when the distance between the heavy particles decreases, and become even unbound at a certain non-zero ‘critical’ distance. Besides these effects we also observe for increasing perturbations (high Zp at low energies) a diffusion like effect in the energy spectrum of emitted electrons [7]. The first excitation step gives rise to an excitation spectrum with a maximum at low energy transfers.