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Configurations of miniature MS with a) 10 cm long tube and b) 6 m long tube as foreline connection between the high-vacuum HiPace 10 pump and the diaphragm pump, tube i.d. 4.8 mm. Pressure variations recorded over a number of continuous scans using c) configuration a and d) configuration b with 13 ms DAPI opening, 600 ms total time for each scan cycle. Spectra recorded with the 1st and 14th scan for e) configuration a and f) configuration b, nanoESI of 5 ppb DNP in methanol.
