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• W1995991268 abstract "The response of γ-N2 on W(110) to electron impact has been investigated. The desorption products are principally neutral N2 and small amounts of neutral N, which may come from decomposition of N2 in the mass analyzer. N+2 was not detected. N+ is seen for electron energies above 60 eV. Approximately 32% of the initial saturated γ-N2 layer (in terms of N atoms) is converted by electron impact to chemisorbed atomic N at E_ = 150 eV, corresponding to N/W ≈ 0.50. It was possible, by thermal desorption after electron impact for different times to follow both the appearance of N and the desorption of N2. It turns out that the cross section for conversion to adsorbed atomic N is 2.5 × 10−18cm2, virtually independent of N2 coverage remaining. The ESD signal for N2 is not proportional to the amount of N2 remaining on the surface. The data indicate that along with desorption there is conversion to a electron impact desorption inactive state (not atomic N) which however is either N2 or desorbs thermally like N2. UPS measurements show that such a new molecular state, with 5σ1π shifted to higher binding energy by ∼ 1 eV is formed by electron impact. The desorption cross section is 1 × 10−17cm2, the conversion to inactive N2, 8.5 × 10−18cm2. The threshold for N2 desorpt E- = 7–8 eV, suggesting creation of a 5σ−1 state as the desorption mechanism near threshold. Conversion to adsorbed N occurred at E- ⩾ 12.5 eV within our detection limit (XPS of the N 1s level of atomic N) suggesting a low energy intramolecular N2 excitation. N+ is not formed from chemisorbed N but by Coulomb explosion of N2, probably after creation of a 3σ−2 hole state. The weak binding of N2 and the resultant large N2-W separation are postulated to account for the absence of N+2 : at the large N2-W distance in the ground state vertical transitions lead to the attractive part of any ionic curves reached, so that N+2 is propelled toward the surface and neutralized before it can desorb as an ion. Similarities and differences with the ESD behavior of CO are rationalized in terms of the differences in 5σ and 2π orbital distributions in the two cases." @default.
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• W1995991268 date "1990-05-01" @default.
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• W1995991268 title "Electron stimulated desorption and conversion of N2 adsorbed on a tungsten (110) plane" @default.
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• W1995991268 doi "https://doi.org/10.1016/0039-6028(90)90203-k" @default.
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