Figure 5.

Summed signal of peak groups displayed in Figure 6 corresponding to [M_n*−OH]⁺, [M_n* + H/D]⁺, and [M_n* + Na]⁺ (n = 1–8, for definition of M_n* see Figure 4) versus eroded depth while profiling through a trehalose film on copper with an HCl doped Ar₂₀₀₀ GCIB at 110 K under simultaneous flooding with D₂O at different partial pressures. The vertical lines mark the times at which the flooding gas partial pressure was changed, the numbers denote the D₂O partial pressure in units of 10⁻⁷ mbar