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Rosenfeldt, Arne Christian: Time-resolved photoelectron spectroscopy of low energy excitations of 4x4 C60 / Cu(111). 2009
Inhalt
1 Introduction
1.1 Electronic and vibronic states of the Buckminster Fullerene
1.1.1 Fullerite
1.1.2 Influence of nuclear motion
1.1.3 Dynamics
1.1.4 Thin films on Cu(111)
1.2 Electronic states in C60
1.2.1 Photoemission
1.2.2 Time-resolved 2PPE from C60
1.2.2.1 Two-photon absorption
1.2.2.2 Two-photon absorption in a statistical ensemble
1.2.2.3 Simulation: Solving the rate equations
1.2.3 Inverse photoemission in combination with UPS
1.2.4 Electrostatic effects
2 Experiment
2.1 Sample preparation
2.1.1 Calibration of the film thickness
2.2 Laser system
2.2.1 Optical parametric oscillator
2.2.2 Optical parametric amplifier
2.3 Photoemission
2.3.1 Approach
2.3.2 Set-up
2.3.3 Measurement software
2.3.4 Analysis
2.3.4.1 Photodiode signals
2.3.4.2 Separation of time-delay spectra into states
2.3.4.3 Positive populations
2.3.4.4 Minimum of a function
2.3.4.5 Fitting the simulation to the measured state dynamics
3 Two-photon photoemission on fullerite films
3.1 Spectroscopic results
3.2 Time-resolved results
3.3 Warm preparation
3.3.1 Singlet exciton
3.3.1.1 Efficacy and lifetime dependencies
3.3.1.2 Interstate rate
3.3.1.3 Comparison with the literature and conclusions
3.3.2 Triplet exciton
3.3.2.1 Dependence on film thickness and temperature
3.4 Cold preparation
3.4.1 Efficacy dependence on photon energy
3.4.2 Improved beam overlap
3.4.3 Conclusions
4 Summary
4.1 German translation
A Ellipsometry details
B References
C Lebenslauf
D Acknowledgment