Datensatz

Zusammenfassung

Collisions between ions and neutrals are decisive for the gas-phase synthesis of complex molecules in the interstellar medium. In order to model the astrochemical network, rate coefficients of existing reactions are required. However, these coefficients were barely measured under astrophysical conditions. The Cryogenic Storage Ring (CSR), housed by the Max Planck Institute for Nuclear Physics, is capable of merging stored and cooled ions with a neutral beam. This results in extremely low collision energies in a low pressure environment. In order to verify the collision temperatures, collisions between H⁺₃ and C were simulated, a crucial reaction for organic astrochemisty. The particle tracking program G4beamline was used to simulate the stored ion beam. The neutral beam was calculated by python in a ballistics approach. The influence of the earth's magnetic field was evaluated by recording the magnetic field with a fluxgate magnetometer at over 400 measuring points. The compensation of the earth's magnetic field by electromagnetic coils was simulated by the _nite element program Opera-3D. Thus, the magnetic field inside the CSR could be reduced to 1/10 of its former power, enabling collision temperatures down to 64 K.