A High-Field / High-Frequency Electron Paramagnetic Resonance Spectrometer (360 GHz / 14 T)

### Title and Contents 1 Einfuehrung p. 7 2 Introduction p. 11 3 Motivation p. 15 4 Gaussian Optics p. 19 4.1 Gaussian Beams p. 19 4.2 Modes in the Fabry--Perot Resonator p. 23 4.3 Coupling of Gaussian Beams p. 26 5 Experimental Setup p. 33 5.1 Microwave Bridge p. 33 5.2 Quasi--Optical Transmission Line p. 39 5.3 Resonator and Field Modulation p. 44 5.4 Sample Handling p. 52 5.5 Spectrometer Sensitivity p. 54 5.6 Numerical Phase Correction p. 55 5.7 Magnet and Cryostat p. 57 5.8 Experiment control software p. 59 6 Spectral Simulations p. 65 6.1 Hamiltonian p. 65 6.2 Calculating Transitions p. 66 6.3 Powder Averages p. 70 6.4 Orientation--dependent Linewidths p. 72 7 Measurements p. 75 7.1 Magnetic field calibration p. 75 7.2 Nitroxide radicals p. 81 7.3 Spectral resolution enhancement p. 84 7.4 Spin--labeled proteins: bacteriorhodopsin p. 89 8 Discussion and Outlook p. 97 9 Conclusion p. 103 Bibliography