#2 RAIRS
This stainless-steel volume is pumped by a CTI-8 4000 l/s cryopump to a base pressure in the low E-10 Torr range. It has an Ion Tech FAB/ion gun for sample cleaning, an UTI-100C mass quadrupole with a home-made retractable nozzle for selective detection of desorbing gases from the solid sample, and a Bruker Equinox 55 spectrometer setup for single grazing reflection from the sample inside the vacuum environment. The manipulator is on-center, and it is placed horizontally to translate the sample between the cleaning/TPD and RAIRS stages. It is capable of resistive heating to > 1300 K and liquid nitrogen cooling to < 90 K. The temperature is controlled via a spot-welded thermocouple and a homemade temperature controller. A retractable high-pressure cell is setup in the far position of the manipulator for in-situ RAIRS detection of adsorbed species during catalysis. A gas manifold and several leak valves are used to introduce gases into the chamber. A micro-batch reactor to follow reaction kinetics inside the high-pressure cell is under construction.
Techniques: RAIRS, TPD, in-situ atmospheric-pressure spectroscopy