Co-adsorption of NH3 and SO2 on quartz(0Â 0Â 0Â 1): Formation of a stabilized complex

► Co-adsorption of NH3 and SO2 on quartz(0 0 0 1) studied by TPD and RAIRS. ► Surface complex formed as a result of co-adsorption irrespective of dosage order. ► Relative molecular composition of the complex dependent on the dosage order. ► Mutual stabilization in the adlayer demonstrated by the TPDs. ► Hydrogen bonding is argued to contribute to stabilization on the basis of RAIRS.