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Nonsequential two-photon ionization of inner-shell $np$ subshell of neutralatoms by circularly polarized light is investigated. Detection of subsequentfluorescence as a signature of the process is proposed and the dependence offluorescence degree of polarization on incident photon beam energy is studied.It is generally expected that the degree of polarization remains approximatelyconstant, except when the beam energy is tuned to an intermediate $n's$resonance. However, strong unexpected change in the polarization degree isdiscovered for nonsequential two-photon ionization at specific incident beamenergy due to a zero contribution of the otherwise dominant ionization channel.Polarization degree of the fluorescence depends less on the beam parameters andits measurements at this specific beam energy, whose position is very sensitiveto the details of the employed theory, are highly desirable for evaluation oftheoretical calculations of nonlinear ionization at hitherto unreachableaccuracy.

Fluorescence polarization as a precise tool for understanding nonsequential many-photon ionization