Nature and Kinetics of Non-Stationary Light Absorption Induced by Femtosecond Laser Pulses in Lead Phthalocyanine and Chloro-Aluminum-Chloro-Phthalocyanine Films
Keywords:Kohlrausch function (a “stretched” exponent), “pump–probe” technique, light absorption, PbPc and ClAlClPc films, femtosecond laser pulses, “hot” bands, temporal kinetics
Spectra of non-stationary light absorption ΔD induced by femtosecond laser pulses in lead phthalocyanine (PbPc) and chloro-aluminum-chloro-phthalocyanine (ClAlClPc) films have been studied. The 210-nm PbPc and 270-nm ClAlClPc films were thermally evaporated in a 6.5-mPa vacuum onto quartz substrates. “Hot” absorption bands induced by electron transitions from non-zero vibronic bands of state S1 into the zero vibronic band of state Sm were registered in the spectral interval of 2.04–2.37 eV. The dependences of the normalized kinetics ΔDn(t) were non-exponential for both films. The experimental curves ΔDn(t) for PbPc and ClAlClPc films are approximated by sums of two and three, respectively, exponents with different relaxation times.
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