It is demonstrated, using tandem mass spectrometry and radio, frequency ion trap, that the adsorption of a H atom on the gold dimer cation, Au2H+, prevents its dissociation and allows for adsorption of CO. Reaction kinetics are measured by employing a radio frequency ion trap where Au-2(+) and CO interact for a given reaction time. The effect of a hydrogen atom is evaluated by comparing reaction fate constants measured for An(2)(+) arid Au2H+. The theoretical results for the adsorption of CO molecules and their reaction characteristics with Au-2(+) and Au2H+ are found to agree with the experimental findings. The joint investigations provide insights into hydrogen atom adsorption effects and consequent reaction mechanisms.