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MS/MS spectrum of singly protonated VYIHPF obtained by (A) sustained off-resonance irradiation at an excitation energy of 19 eV and (B) SID at a collision energy of 35 eV on a 2-(perfluorooctyl)ethanethiolate [CF3(CF2)7CH2CH2S-Au] monolayer surface; Electrospray ionization.
