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(a) Linear absorption spectra and (b) linear transmission spectra of the solution and pure . The molecular chemical structure of the solute is shown in the top-right corner.
(a) One-photon and (b) three-photon excited fluorescence spectra of PASPO in .
Effective 3PA coefficient spectrum of PASPO in pumped by femtosecond laser pulses.
Energy level diagram illustrating vibrational resonance enhanced 4PA process.
Fourth-order dependence of fluorescence intensity on the pump energy at .
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