Experimental and theoretical relative response factors for a pulsed discharge krypton photoionization detector

The relative photoionization cross sections (RePIX) have been determined for a series of compounds normalized to benzene. The detectors are doped (5.01% Kr) Kr-PDPID and pure helium(He-PDPID) pulsed discharge helium photoionization detectors. The pure helium detector is used to reference the responses. The magnitudes for the Kr-PDPID varied from about 0.0 to 0.95. In order to understand the relative responses of these compounds in the Kr-PDPID, the SCF-MO energy levels were calculated for these compounds using HyperChem. Calculated vertical ionization potentials are compared with experimental adiabatic ionization potentials.