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A: Atomphysik

A 3: Multi Photon Processes

A 3.4: Vortrag

Montag, 2. April 2001, 16:30–16:45, H1058

Resonance-like enhancements in high-harmonic generation — •Carla Figueira de Morisson Faria¹, Richard Kopold², Wilhelm Becker², and Jan-Michael Rost¹ — ¹Max Planck Insitut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden — ²Max Born Institut für nichtlineare Optik und Kurzzeitspektroskopie, Max Born Str. 2A, D-12489 Berlin

Pronounced resonance-like enhancements have been recently observed near the low-energy end of the high-harmonic generation [1] and above-threshold ionization plateaus [2]. We investigate these features for high-harmonic generation, using simplified atomic models. In particular, we address the question of which of the physical pictures describing the enhancements, namely resonances involving ponderomotively upshifted Rydberg states [3] or channel-closing effects [4], is correct, or whether they are complementary aspects of a more complete description.
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G.G. Paulus et al, to be published