Kh. Ko et al., PUMP-ENERGY-DEPENDENT PHOTOIONIZATION AND COLLISIONAL IONIZATION IN 2-PHOTON-RESONANT AND 3-PHOTON-IONIZATION PROCESSES, Applied physics. B, Lasers and optics, 66(5), 1998, pp. 617-620
We obtained the energy-dependent ion yields of two-photon-resonant and
three-photon-ionization processes in the dense ytterbium atomic gases
. This dependence could be analyzed by using the rate equation in the
low incident light energy region. However, by increasing the light ene
rgy, we obtained the complex dependence of ion yields on the radiation
energy and we discuss their origin.