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Abstract
We study the characteristics of one-photon resonant two-photon ionization of Sr through the spin-resolved detection of photoions by laser-induced fluorescence. In particular, the dependence of spin polarization on the wavelength and polarization of the ionization laser is experimentally investigated. By changing the polarization of the ionization laser from parallel linear to perpendicular linear with respect to the quantization axis defined by the circularly polarized pump laser, a significant difference is found in the degree of spin polarization, whereas the dependence on the laser wavelength at three different wavelengths (308, 266, and 248 nm) turns out to be very small. To understand the experimental results, we have also undertaken a theoretical analysis, which predicts consistent spin polarization with our experimental results for both parallel and perpendicular linear polarization for a given ratio of bound-free transition moment into the 5sks and 5skd continua. The ratio of the bound-free transition probabilities from the bound 5s5 p3P1 state to the 5sks and 5skd continua is evaluated.
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