Temperature dependence of the NO3-initiated oxidation of cerebroside/fatty acid mixtures studied by simultaneous NR and IRRAS. ISIS Experiment Number: RB1620451

We will add temperature control to our reaction chamber for simultaneous neutron reflectometry(NR) and infra-red reflection absorption spectroscopy (IRRAS). This new set-up will allow us tostudy NO3-initiated oxidation of cerebroside/fatty acid mixtures -proxies for marine aerosols- forthe first time in the atmospherically relevant temperature range of 0 to 20 Celsius. We aim to (i) establish the impact of the presence of Ca2+ on the ordering and stability of the surfactant mixture in two sub-phases (CaCl2 and artificial sea water); (ii) establish the temperature dependence of the oxidative decay at atmospherically relevant temperatures; and (iii) enable simultaneous use of IRRAS and temperature control for this and future studies.