The S 0 measured at different T s of 300 K, 380 K, and 480 K are shown in Figure . These measurements were carried out for three different E i of 0.28 eV, 1.04 eV, and 1.55 eV at normal incidence. No measurable change in the S 0 was observed with increasing surface temperature for all three energies. This clearly shows that within 300 K to 480 K, surface temperature does not play a significant role in the dissociative chemisorption of CO 2 . Another interesting feature observed is that saturation O-atom coverage seen in our measurements increases from 0.5 ML to 0.66 ML for E i greater than 3 eV (Figure ). This suggests that at higher E i new reaction sites become accessible.