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A: Fachverband Atomphysik

A 29: Photoionization II

A 29.1: Hauptvortrag

Donnerstag, 5. März 2009, 14:00–14:30, VMP 8 R208

Radiometry and the nature of light — •Mathias Richter¹, Andrei A. Sorokin¹, and Kai Tiedtke² — ¹Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany — ²Deutsches Elektronen-Synchrotron, Notkestraße 85, 22603 Hamburg, Germany

At the Free-electron LASer in Hamburg FLASH, the non-linear photoionization of rare gases in the vacuum and extreme ultra-violet (VUV, EUV) was investigated by ion spectroscopy [1, 2]. Our quantitative experiments relied on different radiometric methods and tools of X-ray laser diagnostics to measure pulse energy and duration and focus size in absolute terms [3-6]. Thus, the behaviour of the different targets could be compared under equivalent conditions at irradiances from 10¹² to 10¹⁶ W/cm². It came out that, in contrast to optical radiation, the degree of atomic perturbation and the nature of the VUV and EUV light on the interaction strongly depends on the respective target and the excitation of inner-shell resonances.

[1] A. A. Sorokin et al., Phys. Rev. A 75, 051402(R) (2007).

[2] A. A. Sorokin et al., Phys. Rev. Lett. 99, 213002 (2007).

[3] M. Richter et al., Appl. Phys. Lett. 83, 2970 (2003).

[4] A. Sorokin et al., Appl. Phys. Lett. 89, 221114 (2006).

[5] K. Tiedtke et al., J. Appl. Phys. 103, 094511 (2008).