Darmstadt 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Fachverband Atomphysik
A 31: Interaction with intense laser pulses III: VUV and X-ray light
A 31.4: Vortrag
Freitag, 14. März 2008, 14:45–15:00, 3D
Angular Resolved Photoemission from C60 in Intense Laser Fields — •Slawomir Skruszewicz, Nguyen Xuan Truong, Johannes Passig, Thomas Fennel, Andreas Przystawik, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Institut of Physics, University of Rostock
Angular resolved photoelectron spectroscopy is a key method to gain deeper insight into the strong-field photoionization of complex systems, such as multi-electron atoms, molecules, and clusters. A powerful and direct technique for the simultaneous measurement of the energy and angular distribution of the photoelectrons is offered by Velocity Map Imaging spectrometry [1]. In order to resolve electrons with up to 1 keV kinetic energy we have developed a modified five-electrode setup. As a system benchmark we have analyzed the emission spectra from Xe atoms for fs laser excitation and find clear signatures from above-threshold, tunnel-, as well as atomic double ionization - in agreement with earlier studies [2,3]. As the first application of the system we have studied the angular resolved photoemission from C60 as a function of laser pulse length and laser intensity. We found signatures for above-threshold ionization and evidence for contributions of intermediate Rydberg levels [4,5].
[1] H. Helm et al., Phys. Rev. Lett. 70, 3221 (1993).
[2] R.R. Freeman et al., Phys. Rev. Lett. 59, 1092 (1987).
[3] V. Schyja et al., Phys. Rev. A 57, 3692 (1998).
[4] E.E.B. Cambpell et al., Phys. Rev. Lett. 84, 2128 (2000).
[5] M. Boyle et al., Eur. Phys. J. D 36, 339 (2005).