Ultrafast time-resolved photoelectron spectroscopy with tunable deep UV-pulses

Lang, Peter; Homann, Christian; Pugliesi, Igor; Kienberger, Reinhard und Riedle, Eberhard (Mai 2011): Ultrafast time-resolved photoelectron spectroscopy with tunable deep UV-pulses. 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), Munich, Germany, 22-26 May 2011. IEEE Xplore. IEEE.

Abstract

Time resolved photoelectron spectroscopy is a versatile tool for the investigation of ultrafast dynamics in optically dark regions of the molecular potential energy surface. We developed a novel pump-probe-setup, which consists of a magnetic bottle spectrometer and two tunable laser pulses with pulse durations better than 30fs. The pump pulse covers a range of 240-400 nm due to frequency doubling of a NOPA and is used to excite the molecules. The temporally delayed probe pulse with 200-240 nm tunability ionizes the excited molecules and is generated by sum frequency mixing the frequency doubled output of a second NOPA with a part of the fundamental Ti:sapphire laser pulse. This deep-UV probe pulse samples a large range of the electron kinetic energy spectrum up to 3 eV. The tunability allows us to minimize the contribution of electronic excitations by the probe pulse alone. To achieve pulses with a minimum chirp in the interaction zone we are using prism compressors after each NOPA to give the pulse a positive chirp.

• Dokumententyp: Konferenzbeitrag (Paper)
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• Sprache: Englisch