Generation of ultrashort UV pulses and R2PI measurements of deflected molecules

Worbs, Lena

Bachelor Thesis

PUBDB-2015-03619

Generation of ultrashort UV pulses and R2PI measurements of deflected molecules

Worbs, L. (Corresponding author)CFEL*>Extern*

2015
Hamburg

Hamburg 65 pp. (2015) [10.3204/PUBDB-2015-03619] = Universität Hamburg, Bachelorarbeit, 2015

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Please use a persistent id in citations: doi:10.3204/PUBDB-2015-03619

Abstract: This thesis is about the generation and characterization of ultrashort ultraviolet (UV) laser pulses, resonance-enhanced two photon ionization (R2PI) measurements of indole and the electrostatic deflection of indole.UV pulses are generated from a 39 fs Ti:Sapphire Laser with a central wavelength of 800 nm and a bandwidth of 60 nm. To generate UV pulses, the nonlinear process of harmonic generation in a beta-barium-borate (BBO)-crystal is used. A prism compressor ensures group velocity dispersion (GVD) compensation and a cross cor- relation is used to measure the pulse duration of the generated UV pulses. An energy conversion efficiency of up to 6 % of the fundamental energy is achieved to produce UV pulses and the generated pulses have a theoretical minimum pulse duration of 35 fs due to the spectrum.R2PI measurements are used to identify the fragmentation of indole (C8H7N) at UV pulses in comparison to the fragmentation at IR pulses. Additionally, the spatial deflection of indole due to an electric field is measured.The time of flight mass spectra (TOF MS) of indole show great differences when the molecule is ionized by IR or UV pulses, respectively. With UV pulses it is possible to ionize the molecule almost without fragments or background.

Note: Supervisors: Daniel A. Horke and Jochen Küpper
Note: Universität Hamburg, Bachelorarbeit, 2015

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