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Mass spectra recorded using a handheld sampling unit with a coaxial LTP ion source for direct analysis of chemicals from glass slides, a) 1ng DNP and b) 10ng TNT (negative) with Creare 550 turbo pump; c) 10 ng cocaine (positive) and d) 20 ng DNP (negative) with Creare 130 drag pump. Both high vacuum pumps were connected via a1.3m long tube of 3.2 mm i.d. with the Creare scroll pump.
