واکنش اکسید ازت با تک بلور مس (111)

The adsorption of nit ric oxide on a Cu(1l1) surface has been studi ed using X-ray photoelectron (XPS) and high resolution e lectron energy loss spectroscopies (HREEL) in the tcmpenllurc range 80-410 K. Nitricoxide had no interacation with surface at room tempe rature, while it was adsorbed molecularly on un an nealed Cu surface and then dissociated to ni trogen and oxygen atoms. Exposure of surface to NO at 80K showed mo lecular adsorpt ion of NO and N20. The exposure dependent HREEL spectra of NO at the clean Cu su rface at 80K and for subsequent warming up to room temperature showed loss peaks at 344 em-I, 680 em-I, 1525 em-I, 1830 em-I, and 2140 em-I. The vibrational mode at 1830 cm-l was ass igned to N-O stretch of NO handed in a lOp position, the 1525 cm-l loss peak was attributed to the N-O stretch of NO honded in two fold bridge sites, the loss peak at 680 cm-l was assigned to a bending mode of NO(adS) the loss peak at 2140 em-I was due to (N-N) stre tChing mode of N20 formed. The intense feature at 344 em-I was identified as the Cu-NO stre tching mode_