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The Stark effect on the hole-burning spectra of Zn- and Mg-phthalocyanine (Zn-, Mg-PhC) in polyvinylbutyral (PVB) films at 4.2 K have been measured using a tunable diode laser technique in the visible region. Simultaneously, with a linear Stark effect, a quadratic effect was also recorded. From comparison of the experimental data with the results of model calculations, the Stark parameters for both systems and a value of the internal electric field in polymer matrix were deduced. For Zn-PhC in PVB, we obtained average values of the induced dipole moment difference between ground and excited states: Δ μ ind =0.105 D; the polarizability tensor difference: Δ α =62 A 3 ; average local field value: E i =7×10 5 V cm −1 . For Mg-PhC in PVB: Δ μ ind =0.095 D, Δ α =50 A 3 and E i =6.5×10 5 V cm −1 . |
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