Download Atoms and Molecules in Strong External Fields by P. Schmelcher, W. Schweizer PDF

By P. Schmelcher, W. Schweizer

This e-book comprises contributions to the 172. WE-Heraeus-Seminar “Atoms and Molecules in robust exterior Fields,” which happened April 7–11 1997 on the Phys- zentrum undesirable Honnef (Germany). The designation “strong fields” applies to exterior static magnetic, and/or electrical fields which are sufficiently severe to reason adjustments within the atomic or molecular str- ture and dynamics. the explicit issues taken care of are the habit and houses of atoms in powerful static fields, the basic features and digital constitution of molecules in robust magnetic fields, the dynamics and features of chaos in hugely excited R- berg atoms in exterior fields, topic within the surroundings of astrophysical items (white dwarfs, neutron stars), and quantum nanostructures in powerful magnetic fields. it's seen that the elaboration of the corresponding homes in those regimes explanations the best problems, and is incomplete even this present day. Present-day expertise has made it attainable for plenty of study teams to check the habit of subject in robust exterior fields, either experimentally and theore- cally, the place the word “experimentally” contains the astronomical observations. - derstanding those structures calls for the improvement of contemporary theories and robust computational innovations. Interdisciplinary collaborations should be priceless and important in constructing extra effective how to comprehend those vital platforms. consequently the assumption used to be to compile humans from assorted fields like atomic and molecular physics, theoretical chemistry, astrophysics and all these colleagues attracted to points of few-body structures in exterior fields.

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Atoms and Molecules in Strong External Fields

This ebook includes contributions to the 172. WE-Heraeus-Seminar “Atoms and Molecules in robust exterior Fields,” which happened April 7–11 1997 on the Phys- zentrum undesirable Honnef (Germany). The designation “strong fields” applies to exterior static magnetic, and/or electrical fields which are sufficiently extreme to reason adjustments within the atomic or molecular str- ture and dynamics.

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We calculated photoionization spectra at optical wavelengths in a strong magnetic field with parallel electric fields of various strengths. The electric field modulates the ionization spectra strongly through an onsetting resonance structure (Fig. 2), which behaves smoothly by changing the electric field strength. The electric fields in the atmosphere of the white dwarf are generated by free electrons and ions in the stellar plasma and hence distributed statistically. Taking this statistical origin into account the strong resonance features are smeared out by the electric field distribution and the opacities can be approximated by straight lines over the relatively small wavelength range in question.

At these field strengths the magnetic forces outweigh the Coulomb binding forces, even for low-lying energies. , 1994) have resulted in a much better understanding of the spectra of hydrogen-dominated white dwarfs, there are still magnetic white dwarfs like the GD229 with unexplained absorption spectra, for which transitions of neutral He are considered to be important (Schmidt and Latter, 1990). Therefore the properties of the helium atom in strong magnetic fields are of great relevance. , 1993).

They used the same code of Neuhauser et al. (1986) to calculate the energies and wave functions of iron ions for subsequent calculations of the ionization equilibrium and radiative transitions for two polarization modes. The models are inevitably very approximate: for instance, applicability of the adiabatic approximation is even more questionable for iron than for carbon and nitrogen, the nonideality effects on the equation of state and radiative transitions (virtually neglected in this paper) are particularly severe in iron atmospheres, etc.

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