Ionization Sources - II. EI and CI have limitations Both require a volatile sample Samples must be thermally stable Neither lends itself to LC/MS analysis Other techniques have been developed FAB (Fast Atom Bombardment) MALDI (Matrix Assisted Laser Desorption) ESI (Electrospray)
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Δm = 1 amu ; ∆(m/z) ≈ 0.055; z = 18
; Δ(m/z) ≈ 0.10
Δm = 1 amu
z = 10
(low femtomole to zeptomole)