Download Computational Methods for Electron—Molecule Collisions by T. N. Rescigno, C. W. McCurdy, A. E. Orel, B. H. Lengsfield PDF

By T. N. Rescigno, C. W. McCurdy, A. E. Orel, B. H. Lengsfield III (auth.), Winifred M. Huo, Franco A. Gianturco (eds.)

The collision of electrons with molecules and molecular ions is a basic seasoned­ cess in atomic and molecular physics and in chemistry. At excessive incident electron en­ ergies, electron-molecule collisions are used to infer molecular geometries, oscillator strengths for optically allowed transitions, and on the subject of electron-impact ionization, to probe the momentum distribution of the molecule itself. while the incident electron power is similar to or less than these of the molecular valence electrons, the physics concerned is especially wealthy. Correlation and trade results essential to describe such collision methods endure a detailed resemblance to related efft:cts within the thought of digital constitution in molecules. Compound kingdom formations, within the kind of resonances and vir­ tual states, appear themselves in experimental observables which offer info of the electron-molecule interactions. Ro-vibrational excitations through low-energy electron collisions exemplify power move among the digital and nuclear movement. The function of nonadiabatic interplay is raised right here. whilst the ultimate vibrational country is within the continuum, molecular dissociation happens. Dissociative recombination and dissociative attachment are examples of such fragmentation strategies. as well as its primary nature, the learn of electron-molecule collisions is additionally influenced through its relation to different fields of research and by way of its technological appli­ cations. The learn of planetary atmospheres and the interstellar medium inevitably contain collision strategies of electrons with molecules and molecular ions.

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There is evidently a broad resonance near 16 e V. 00 Q) .... 0 }'igur" 1. 0 elastic cross section. Solid curve: static-exch~Ulge plus penetration term; broken curve: static-exch,Ulge without penetration term; solid circles: 2-chmlllel calculation including penetration term. function, which differs only slightly from the target CI wave function we used, show no such structure. Moreover, if the calculation is performed without the la~ lag term, the resonance disappears. This result is also shown in Fig.

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