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

By P. Schmelcher, W. Schweizer

This e-book includes contributions to the 172. WE-Heraeus-Seminar “Atoms and Molecules in powerful exterior Fields,” which came about 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. the categorical issues taken care of are the habit and houses of atoms in powerful static fields, the basic elements and digital constitution of molecules in powerful magnetic fields, the dynamics and elements of chaos in hugely excited R- berg atoms in exterior fields, subject within the surroundings of astrophysical items (white dwarfs, neutron stars), and quantum nanostructures in powerful magnetic fields. it's noticeable that the elaboration of the corresponding homes in those regimes reasons the best problems, and is incomplete even this present day. Present-day expertise has made it attainable for plenty of study teams to review 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 advance of contemporary theories and robust computational thoughts. Interdisciplinary collaborations should be valuable and precious in constructing extra effective how to comprehend those vital structures. for this reason the belief used to be to compile humans from diverse fields like atomic and molecular physics, theoretical chemistry, astrophysics and all these colleagues drawn to elements of few-body structures in exterior fields.

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A few of the X-ray radiating radio pulsars show thermal-like radiation of higher temperatures, from an area much smaller than that of the NS surface; this radiation is attributed to polar caps heated by the backward accretion of relativistic particles from the pulsar magnetospheres. Finally, at least 7 radio pulsars have been detected in the optical-UV range (Caraveo, 1997), a thermal component (i. , the NS surface) is seen in 3 of them. , 1996). Since these objects do not show any activity and are not visible Atoms and Molecules in Strong External Fields Edited by Schmelcher and Schweizer, Plenum Press, New York, 1998 37 outside the X-ray range, their radiation almost certainly originates from the NS surface.

1994, Hyperspherical close-coupling calculation of positronium formation cross sections in positron-hydrogen scattering at low energies, J. Phys. B 27:5065 30 THE SPECTRUM OF ATOMIC HYDROGEN IN MAGNETIC AND ELECTRIC FIELDS OF WHITE DWARF STARS Peter 1 2 and Wolfgang Schweizer1,2 Institut für Astronomie und Astrophysik Abteilung Theoretische Astrophysik Universität Tübingen 72076 Tübingen, Germany Fakultät für Physik und Astronomie Theoretische Physik I Ruhr-Universität Bochum 44780 Bochum, Germany INTRODUCTION Despite its long history, the problem of a hydrogen atom in external magnetic and electric fields is still of significant interest.

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. However, the models can be considered as a starting pont for future work on atmosphere modeling and a baseline for comparison with the magnetic hydrogen atmosphere models.

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