Precision Spectroscopy in Astrophysics : Proceedings of the ESO Lisbon Aveiro Conference held in Aveiro Portugal 11 15 September 2006 High accuracy Doppler shift measurements and high precision spectroscopy are primary techniques in the search for exo planets. Further extremely interesting applications include the analysis of QSO absorption lines to determine the variability of physical constants and the analysis of the isotopic ratios of absorption lines both in stars and in QSOs and the determination of stellar oscillations through radial velocity measurements. Since the use of high precision resolution spectroscopy is closely connected to the ability to collect a large number of photons the scientific domains using this