RELATIVE RESPONSES OF VARIOUS CLASSES OF COMPOUNDS USING A PULSED DISCHARGE HELIUM PHOTOIONIZATION DETECTOR - EXPERIMENTAL-DETERMINATION AND THEORETICAL CALCULATIONS

The relative response factors for 174 compounds have been determined u sing a helium pulsed discharge photoionization detector. The values we re obtained with a relative standard deviation that ranged to 4.3% wit h a median of 1%. The mean values of the relative mass response factor s ranged from 0.26 to 1.18. If the detector is not calibrated and equa l response factors are assumed, a potential error of +/-32% could be e xpected. The SCF molecular orbitals of these same molecules were calcu lated and used to determine the number of ionizable electrons based up on the He-2 continuous emission. The molar response of the compounds a nd the number of ionizable electrons are well correlated.