Osnabrück 2002 – scientific programme

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MO: Molekülphysik

MO 11: Femtosekundenspektroskopie IV: molekulare Dynamik

MO 11.7: Talk

Wednesday, March 6, 2002, 18:00–18:15, HS 15/E07

Ultrafast Spectroscopy of C₆₀ — •Mark Boyle¹, C.P. Schulz¹, E.E.B. Campbell², and I.V. Hertel¹ — ¹Max Born Strasse 2A, 12489 Berlin — ²Göteborg University and Chalmers University of Technology, SE-41296, Göteborg, Sweden

The C₆₀ cluster is an interesting model system for studying laser-matter interaction. The high degree of symmetry facilitates the studies of a complex system. Photoelectron spectroscopy has illuminated extremely diverse characteristics varying from a solid-like delayed ionization to atom-like Rydberg structure. Laser pulse duration dependence on the photoelectron spectra has shown three distinctive ionization regions, one prompt, direct ionization for pulse durations less than 100 fs is characterized by above threshold ionization peaks. The first thermal region results from electronically hot, but vibrationally cool C₆₀ occurring with laser pulse durations between 100 and 700 fs, and a second thermal region, characterized by electronic emission on the microsecond timescale with significantly lower temperature despite the same laser fluence as compared to the first thermal region and occurs with pulse durations in the range of picoseconds. At relatively low laser intensities, an additional structure was observed on top of the thermal electron distribution. This structure has been attributed to Rydberg Series [1]. This presentation will discuss recent experimental results on the Rydberg structure.
Boyle, et al. PRL 87, (27) 3401