We present the first synthesis of Mn I lines in realistic multi-component magnetized quiet Sun atmospheres, including variation of magnetic field strength, magnetic field direction, plasma velocity, and coupling between magnetic field and thermodynamics. All synthesized Mn I lines weaken for strong magnetic fields. A detailed analysis of the Mn I

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We have developed a technique for the measurement of state-to-state rotational relaxation rates due to collisions in the gas phase. A single J state of the v_{2}=1 vibrational level of acetylene is populated by a Stimulated Raman process. After a variable delay of a few ns we record high resolution (˜ 0.003 cm^{-1}) spectra of the Q-branch of the v

Context: The knowledge of the binary properties of metal-poor and solar-metallicity stars can shed light on the potential differences between the formation processes responsible for both types of objects. Aims: The aim of the project is to determine the binary properties (separation, mass ratio, frequency of companions) for M subdwarfs, the low