DENSITY-DEPENDENCE OF THE IONIZATION-POTENTIAL OF CH3I IN KRYPTON ANDOF THE QUASI-FREE ELECTRON-ENERGY IN KRYPTON

Field ionization has been employed to determine the ionization potenti al of CH3I doped in krypton for krypton densities between the gas and the triple point liquid. The ionization potential is correlated to the different configurations of the host atoms around the dopant at the m oment of excitation and is, therefore, represented by a distribution. The ion-medium polarization energy distribution was calculated, from t he first and second moments, at the densities at which the experiments were performed. The calculated widths are in very good agreement with those of the experimentally determined ionization potentials. By comb ining the experimental results with those of the calculations, the den sity dependence of the quasi-free electron energy in Kr was determined . These results are compared to those obtained in previous experiments and with recent theoretical calculations. (C) 1995 American Institute of Physics.