Auger spectra molecules

Both phenomena may disfavour the flat adsorption of the molecule of prenal to the benefit of an adsorption through the C=0 double bond with a partial raising up of the molecule. If oxygen atoms are actually present on the surface as suggested by the Auger Spectrum, they... 

Another application is to the study of the Auger states in which a further electron ionization of attachment may occur, leaving the system with holes in more than one shell. Such states were considered in some detail by Firsht and McWeeny [9] for free atoms here we have made a preliminary application to the nitrogen molecule. The initial aim is simply to identify and assign the principal peaks and satellites in the Auger spectrum of gaseous N2. 

As demonstrated by the results presented above, the probability of dissociative chemisorption can be readily probed by measuring the extent of carbon deposition by Auger electron spectroscopy. However, a complete picture of the dissociative adsorption process requires that the product of the dissociative chemisorption event be spectroscopically identified. For example, although the discussion has assumed that a single C-H bond cleaves upon dissociation, no evidence for this has been presented. In order to identify chemically the product of the dissociative chemisorption event, we have measured the high resolution electron energy loss spectrum for methane deposited on the Ni(lll) surface at 140 K with an incident energy of 17 kcal/mole. The spectrum is shown in Fig. 4a. A low surface temperature is chosen in order to trap the nascent product of the dissociative chemisorption and not a thermal decomposition product. The temperature of the surface has no effect on the probability for dissociative chemisorption since the dissociation occurs immediately upon impact of the molecule on the surface. 

In atoms and molecules, shakeup satellites, corresponding to internal electronic transitions, are routinely observed using photoelectron and resonant Raman spectroscopy. In particular, shakeup satellites can be observed in the two particle spectrum, i.e., when two holes are left in the final state of an atom after electron emission. Satellite s strength can be strongly enhanced in the presence of a resonant intermediate state. For example, in copper atoms, the incident photon can first excite the core 3p electron to the 4s shell the core hole then decays to the 3d shell through the Auger process (with electron ejected from 3d shell) leaving two 3d holes in the final state [48]. For recent reviews of extensive literature the reader is referred to Refe. [49,50]). 

Auger spectroscopy provides valuable information on the electronic structure of molecules and of atoms in different chemical environments. To interpret Auger spectra one needs the DIPs and rates associated with the contributing final dicationic states. For atoms and atom-like molecules the density of doubly ionized states of experimental relevance is relatively small and it is reasonable to expect that the observed Auger peaks can be interpreted in terms of individual states. The situation is different for polyatomic molecules. Even on the level of independent particles the density of states contributing to a spectrum can be high and may considerably increase by final state interactions. 

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