Describe the processes involved in electron impact and electrospray ionisation for analysis by mass spectrometry. What sample types would these two techniques be used for? In an experiment using a time-of-flight (tof) mass spectrometer, the following experimental parameters are used: Accelerating voltage (V) = 14000 V; path length (L) = 1.2 m. A protein molecule has a relative molecular mass of4710 g mol1 and is ionised by adsorption of ammonium ions (M, = 18). What would be the predicted detection time if: i)one (1) ammonium ion and ii)twelve (12) ammonium ions have been adsorbed to form an ion? NA = 6.022 x 1023 mol1%3D e3D 1.602 х 1019 C

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