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The signal intensities measure by RIT for sequentially mass-selectively transferred amitriptyline m/z 278 and amitriptyline-d6, m/z 284. Paper spray of methanol solution with amitriptyline and amitriptyline-d6 at 120 ng/mL, spray voltage of 4.3 kV. AC excitation of 80 mV 169 kHz, q = 0.45, for mass-selective transfer from QLIT. q = 0.2 for the trapping the ions in RIT.
