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MO: Molekülphysik

MO 4: Posters Tuesday: Photoionisation

MO 4.8: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Towards establishing the resolution limit of PFI-ZEKE photoelectron spectroscopy — •Urs Hollenstein, Robert Seiler, and Frédéric Merkt — Laboratorium für Physikalische Chemie, ETH Zürich, CH-8092 Zürich, Switzerland

A broadly tunable laser system in the extreme ultraviolet with a bandwidth of 0.008 cm⁻¹ has been developed for use in high-resolution pulsed-field-ionisation zero-kinetic-energy (PFI-ZEKE) threshold photoelectron spectroscopy.

A methodology based on tailored sequences of pulsed electric fields has been implemented that enables PFI-ZEKE photoelectron spectra to be measured at a resolution of 0.06 cm⁻¹. The method relies on the dependence of the ionisation rate of Stark states on the parabolic quantum numbers.

PFI-ZEKE spectra of the argon atom will be presented. These spectra have also been simulated theoretically on a quantitative basis; the theoretic framework required to understand these new results will be discussed.