Infrared chemiluminescence study of COÂ +Â O2 reaction on Pd(1Â 1Â 0): Activated complex of CO2 formation at high CO coverage

The infrared chemiluminescence study of CO2 formed during steady-state CO + O2 reaction over Pd(1 1 0) under various CO/O2 pressure ratios was carried out. Highly excited antisymmetric vibrational mode compared to bending vibrational mode was observed under reaction conditions at high CO coverage. This can be related to the activated complex of CO2 formation in more linear form.