Field ionization and photoionization of CH₃I perturbed by diatomic molecules: electron scattering in H₂, HD, D₂and O₂

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Photoionization and field ionization studies of CH3I doped into the diatomics H2, HD, D2 and O2 (up to a density of 1.0 × 1021 cm−3) are presented. These data are used to extract the zero-kinetic-energy electron scattering length of each diatomic molecule from the density-dependent shift of the CH3I ionization energy. Scattering lengths obtained from fits of the photoionization spectra are compared to those determined from field ionization measurements.