NO and CO desorption from oxide surfaces

The desorption cross section a of NO and CO from oxide surfaces is higher by orders of magnitude than in desorption from metal surfaces, e.g. cr = 3 x 10 17 cm2 for CO from Cr2O3(0 0 0 1) at = 193 nm 

Al-Shamery et al. [29] observed CO desorption from Cr203(000 1) at 90 K using the (1 + 10REMPI method at X = 193 nm. In contrast to the (2 + 1)REMPI process, the single rovibrational states are 

When the REMPI signal intensities are measured rotating the X/2 plate by 90°, 7 and I are obtained with the probe laser polarization parallel and perpendicular to the surface normal, respectively. The so-called polarization Rv can be calculated by 

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