Figure 8

APPI sampling chamber; (1) MS inlet, (2) 3D printed end plate, (3) 2nd electrode, (4) 1st electrode, (5) sample entry, (6) 3D-printed body, (7) grounded metal collar for lamp, (8) UV lamp at 10.6 eV, (9) exhaust, (10) PTFE electrode spacer. Blue arrows indicate the direction of sample gas flow. Red arrows indicate the direction of travel of photo generated ions.