NO adsorption on Ge(1 0 0) studied by TPD

Dimerization of NO and transformation to N2O on Ge()

“…TPD spectra for NO dosed onto Ge(100) at 110 K have been presented in previous publications [30,37]. These show that as the NO dose increases, the desorption of mass 30 (NO molecules) increases, producing a weak desorption peak at about 220 K as the dose reaches 0.7 L, which is consistent with previous results indicating mostly nondissociative adsorption [30].…”

“…As mentioned in our previous work on low coverages [37], it is difficult to explain the near simultaneous thermal desorption of mass 44 and mass 28, in additional to the expected mass 30, from an initial coverage of NO at such low temperatures without postulating the existence of dimers on the surface, which would produce the N-N bonds needed to get mass 44 or mass 28 products. The TPD results shown in reference [37] even suggest that it is about as likely for such dimers to decompose into N 2 or N 2 O at low temperature as it is for them to desorb as single NO molecules.…”

“…The TPD results shown in reference [37] even suggest that it is about as likely for such dimers to decompose into N 2 or N 2 O at low temperature as it is for them to desorb as single NO molecules. In particular, the desorption curves for mass 28 and 30 are almost identical.…”

Sequential desorption of dimers from square lattices: A novel mechanism for phase transitions

“…Even simple gases, like nitrogen, carbon monoxide, oxygen, etc., are composed of more than one atom and can therefore, in principle, occupy more than one site, as has been reported experimentally [21,22]. More complicated molecules such as C m H 2(m−1) adsorbed on different solid surfaces represent a clear example of the multisite adsorption process.…”

Theoretical study of NO adsorbed on the surface of TiO2(110) cluster model

“…The adsorption of gas molecules on metals, metal oxides or alloys had been researched widely to find a solution for the problem of air pollution (Davies and Craig Jr., 2003;Yanagisawa, 1996;Tominaga et al, 1999). NO could be adsorbed on the particle surface and desorbed as N 2 from the surface by temperature programmed desorption (TPD) (Davies and Craig Jr., 2003;Yanagisawa, 1996). The calculation of cluster model was established with molecular orbital (MO) theory (Ryu et al, 1999;Shimizu and Tachikawa, 2002).…”