ESCA	Electron Spectroscopy for Chemical Analysis
XPD	X-ray Photo Electron Diffraction
ArTOF	Angle resolved Time-of-Flight
FEL	Free-Electron Laser
VUV	Vacuum Ultra-Violet
SASE	Self-Amplified Spontaneous Emission
HHG	Higher Harmonics Generation
TaS2	Tantalumdisulphide
PGM	Plane Grating Monochromator
PPRE	Pulse Picking by Resonant Excitation
TRIBs	Transverse Island Buckets
FWHM	Full Width at Half Maximum
APD	Avalanche Photo Diode
MB	Multibunch
CS	Camshaft (bunch)
BBO	Beta Barium Borate
OPA	Optical Paramteric Amplifier
UV	Ultra-Violet
ND	Neutral Density
AR	Anti Reflective
MIM	Minimum Incremental Motion
TMP	Turbo Molecular Pump
IGP	Ion Getter Pump
NEG	Non-Evaporable Getter Pump
LHe	Liquid Helium
LEED	Low-Energy Electron Diffraction
LN2	Liquid Nitrogen
CDW	Charge Density Wave
ICCDW	Incommensurate Charge Density Wave
NCCDW	Nearly Commensurate Charge Density Wave
CCDW	Commensurate Charge Density Wave
PLD	Periodic Lattice Distortion
XPS	X-ray Photoelectron Spectroscopy
SO	Spin-Orbit
trPES	Time-Resolved Photoemission Spectroscopy
FLASH	Free-Electron Laser in Hamburg
HHG	Higher Harmonic Generation
SCS	Space-Charge Shift