Coherence Phenomena in Atoms and Molecules in Laser Fields by R. Trainham, N. J. van Druten, L. D. Noordam, H. G. Muller,

By R. Trainham, N. J. van Druten, L. D. Noordam, H. G. Muller, P. Breger, G. Petite (auth.), André D. Bandrauk, Stephen C. Wallace (eds.)

This quantity comprises the lectures and communications awarded on the NATO complex study Workshop (NATO ARW 900857) which used to be held could 5-10, 1991 at McMaster collage, Hamilton, Ontario, Canada. a systematic commitee made of P.P. Lambropoulos (USC & Crete), P.8. Corkum (NRC, Ottawa), and H. B. vL. van den Heuvell (FOM, Amsterdam) guided the organizers, A.D. Bandrauk (Sherbrooke) and S.C. Wallace (Toronto) in getting ready a programme which might conceal the newest advances within the box of atom and molecule laser interactions. because the final assembly held in July 1987 on "Atomic and Molecular techniques with brief extreme Laser Pulses", NATO ASI vol 1718 (Plenum Press 1988), massive development has been made in realizing excessive depth results on atoms and the concomitant coherence results. After 4 years, the emphasis is now transferring extra to molecules. the current quantity represents accordingly this development with 4 sections protecting the most pursuits of study endeavours during this zone: i) Atoms in excessive Laser-Fields ii) Molecules in extreme Laser Fields iii) Atomic Coherences iv) Molecular Coherences The adventure built through the years in multiphoton atomic procedures has been very beneficial and is the most resource of our figuring out of comparable tactics in molecules. hence ATI (above­ threshold ionization) has been chanced on to ensue in molecules in addition to a brand new phenomenon, ATD (above-threshold dissociation). Laser-induced refrained from crossings of molecular digital surfaces can be now getting into the present language of excessive depth molecular processes.

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Since spherical mirrors affect rays in basically the same way as a thin lens, it should come as no surprise to allyone who knows elementary quantum mechanics that the modes of stable laser resonators are Gaussian fields. 46 Anharmonic Oscillator Similarly we can construct the optical analog of an anharmonic oscillator with potential V(z)

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Finally, not only the duration (width at half-maxmum) of the pulse but also the detailed shape, specifically how fast it rises, is equally critical. We have chosen to employ a realistic pulse shape. One can of course perform calculations with any desired pulse shape. it is not, however, obvious that one can shape to any arbitrary form a superintense. For a pictorical appreciation of the interplay between pulse duration, intensity and ionization during the pulse, we have presented in Figs la-d the amount of "ionization" as function of time during the pulse.

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