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Fig. 1.16 a Excitation power dependence of transient absorbance changes of PT(c) in n-hexane
solution at 2 ps after the excitation with a femtosecond laser pulse at 730 nm. The monitoring
wavelength was 600 nm. b Correlation trace of the permanent bleaching induced by off-resonant
simultaneous two-photon absorption as a function of time intervals between two 730-nm excitation
pulses. A signal from neat solvent is also shown for comparison. Adapted with permission from
Ref. [22]. Copyright (2017) American Chemical Society
Fig. 1.17 Transient absorption spectra of PT(c) in n-hexane solution excited at 365 nm, (a), and
those at 730 nm, (b). The spectra around 730 nm are not shown due to strong scattering of the
excitation pulse at 730 nm. The spectral features denoted by asterisk are due to stimulated Raman
scattering of the solvent. The excitation powers were 170 and 740 nJ for the excitation at 365
and 730 nm, respectively. Reprinted with permission from Ref. [22]. Copyright (2017) American
Chemical Society