Schematic diagram of the apparatus, including the time-of-flight mass analyzer and sample load-lock.
XPS measurements of N1s (binding energy of ∼400 eV) peak for SAM-DNA, 2.5-, 5-, and 10-monolayer-thick lyophilized DNA films where intensity is proportional to the amount of DNA chemisorbed on a gold substrate.
Normalized anion yield functions from SAM-DNA and 5-monolayer-thick DNA film.
Variation of anion desorption signal from 10-monolayer-thick lyophilized DNA with incident electron current, at an incident electron energy of 8 eV.
Variation of the anion desorption signal (integrated over incident electron energies (between 0.1 and 20 eV) with thickness (in monolayers) of a lyophilized DNA film on gold substrate.
Energy and width of electron resonances and threshold energies observed in anion yield functions from self-assembled and lyophilized DNA films. Resonance energies were obtained “by-eye.” The widths of the resonance structures are measured at half maximum.
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