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Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.29: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

Dynamics of the Auger Doppler effect in HF — •Karoline Wiesner1, Arnaldo Naves de Brito2, Margit Bässler1, Stacey Sorensen3, Svante Svensson1, and Olle Björneholm11Department of Physics, Uppsala University, Box 530 75121 Uppsala, Sweden — 2Laboratorio Nacional de Luz Sincrotron, Box 6192 CEP 13083-970 Campinas SP, Brazil — 3Department of Synchrotron Radiation Research, Institute of Physics, Lund University, Box 118, 22100 Lund, Sweden

The study of electronically highly excited, short-lived molecular states using resonant Auger spectroscopy (RAS) provides a way to monitor molecular processes on the low femtosecond scale. By measuring the Auger Doppler effect characteristic dissociation time can be obtained, like for O2. In the Auger Doppler effect electrons, ejected after dissociation, are detected bearing additional kinetic energy from the emitting fragment.

In the here presented study the Auger Doppler method was used for HF. The excitation energy was detuned around the resonance F1s→4σ thus monitoring the dynamics of the fragments. The photon energy difference relative to the resonance energy leads to variation in the kinetic energy of the fragments. A model including total energy arguments and experimental geometry is compared to the experimental data and found to be in good agreement. The presented measurements were undertaken at the MAX II storage ring, MAX-lab in Lund, Sweden.

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