By T. F. Gallagher (auth.), Professor Naseem K. Rahman, Professor Carla Guidotti, Dr. Maria Allegrini (eds.)

Since 1981 there was an test in Europe to arrange a chain of small meetings/workshops/tavole rotonde with the purpose of bringing jointly physi­ cists and chemists drawn to difficulties relating atoms or molecules in­ teracting with exterior photons the place the continua are investigated. The variety of difficulties that fall into this classification seems to be titanic. even though, it isn't attainable to make a strict separation into difficulties con­ cerning atomic and molecular collisions and people with regards to the standard spec­ troscopy. This admixture of 2 disciplines, discussions at the function of photons and at the interplay of exterior electromagnetic fields with the continuum supplied a crucial motivation for those workshops. The fourth of this sequence of conferences was once held at Cortona among June sixteen and 20, 1986. It was once attended through approximately a hundred researchers within the box and there have been forty three shows, all having equivalent time. those talks shape the subject material of this quantity. the assumption of publishing the complaints of those conferences isn't really new. It permits one to have small conferences within which the subject material may be mentioned at size in a full of life surroundings. besides the fact that, after the assembly is over, the audio system can acquire their options and bring articles during which the result of their interplay with the opposite individuals will be incorporated.

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Extra info for Photons and Continuum States of Atoms and Molecules: Proceedings of a Workshop Cortona, Italy, June 16–20, 1986

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Therefore we will now consider what the nonperturbative theories (B) have to say concerning these problems. 2. e. no longer into a free electron state), in which latter states (Fig. 1) the field effects are considered to be predominant but the atomic binding effects are neglected. Therefore, these theories are expected to hold at high intensities. g. the case of H-). Later on, many theories - based on Keldysh's work - were proposed: for atoms [6-13], and for metals [13-15]. The most recent elaboration of Keldysh's idea for atoms was published by REISS [16].

V. Jensen, Phys. Rev. 90A, 386 (1984). 6. V. Jensen, to appear in the Proceedings of the Adriatico Research Conference on Quantum Chaos, Trieste, 1986 published by Physica Scripta. 7. J. A. Lieberman, Regular and Stochastic Motion, (Springer, New York, 1983). V. Jensen, "Classical Chaos", (to appear in American Scientist, March 1987) and references therein. 8. See articles in Chaotic Behavior in Quantum Systems, edited by G. Casati, (Plenum, New York, 1985). 9. O. Rath and D. Richards, private communication.

It will certainly be interesting to find how the nonperturbative theory works in the short (VUV) wavelength region [19 J. 3. I·lore recent experiment for metals In the case of metals we may investigate the problem in a slightly different context. The number ~f metallic electrons capable of ionization is of the order of 10 22 /cm 3 instead of 10 2/cm 3 as in the case of gases, eliminating thus the immediate saturations discussed previously. At the same time an additional competing process may occur: the laser-induced thermionic (Richardson) emission.

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