Absolute Measurement of the Photoionization Cross Section of the Excited 7pState of Potassium

Abstract

Tbe absolute photoionization cross section for tbe excited 7p state of K has been measured using the method of ionization saturation. The measured cross sections u , ~ (321.8nm) and uTP (643.6nm) are (0.9f0.6) M b and (1.9f0.9) Mb, respectively. Tbe results are in good agreement with the calculated values.

Two-step laser excitation and ionization from the 7p2P3/2state of potassium

“…In figure 5 we show the existing experimental and theoretical calculations of the photoionization cross-sections from the 7p excited state ss a function of ionizing laser wavelengths. The solid line represents the theoretical data obtained from the published curve of the data reported by Aymar et al [6], solid circle is the experimental data reported by Feng and Zhang [17] whereas the solid squares are the present experimental results. Evidently, all the experimental data points lie on the theoretically calculated curve.…”

“…Burkhardt et al [16] determined the photoionization cross-sections and atomic densities for the resonance levels of sodium, barium and potassium using the saturation technique. Feng and Zhang [17] measured the photoionization cross-section from the 7p excited state whereas, Amin et al [18] reported the photoionization cross-sections from the 4p, 5d and 7s excited states using the saturation technique in conjunction with a thermionic diode ion detector. Borovick [19] measured the autoionization cross-section of potassium atoms excited by electron impact in the energy range from 18.72 to 202 eV.…”