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• W1588306562 abstract "The interactions of low-energy (5–50 eV) electrons with acetylene-d2 (C2D2) adsorbed on the Si(111)-(7×7) surface have been examined by monitoring the stimulated desorption products. These include primary cation desorbates, D+ and C2D2+ (C2HD+), the fragment ion C2D+, smaller amounts of C2+, CDH+ (CH3+), and neutral D(S2). The ∼23–25 eV threshold energies for D+ and hydrocarbon fragment ion detection indicate involvement of two-hole or two-hole one electron final states that Coulomb explode. These multihole states can be created via Auger decay of single holes in shallow core levels localized on C or Si surface atoms. The ∼12 eV appearance threshold for the C2D2+ molecular ion can be correlated with direct excitation of an adsorbate-induced surface state, which may initially possess character of the A3 surface state of Si. The 18 eV threshold for C2D+ correlates with decomposition of C2D2+ with excess vibronic energy. C2D+ desorption via direct excitation of the dissociative ∑u+2-type state of the C2D2+ ion is also possible. The ∼8 eV threshold energy for production and desorption of neutral D(S2) may correlate with excitation of the perturbed/mixed F ∑u+1←X ∑g+1 and E ∑u+1←X∑g+1 dissociative transitions of adsorbed acetylene molecules. Time-of-flight distributions of D(S2) indicate both nonthermal (557 and 116 meV; 4300 and 900 K) and thermal (17 meV; 130 K) components. The two fast components can be related to the geometry of di-σ bonded acetylene on the Si(111)-(7×7) surface." @default.
• W1588306562 created "2016-06-24" @default.
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• W1588306562 date "2010-06-04" @default.
• W1588306562 modified "2023-09-24" @default.
• W1588306562 title "Low-energy electron-stimulated desorption of cations and neutrals from Si(111)-(7×7):C2D2" @default.
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• W1588306562 doi "https://doi.org/10.1063/1.3432126" @default.
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