An electron spin echo study of the photoexcited triplet state of tetracene in p-terphenyl crystals at room temperature

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Abstract
Room temperature magnetic resonance studies of the photoexcited triplet state of tetracene in p‐terphenyl crystals have been carried out by the electron spin echo technique. The studies yield the following structural and dynamical information: (1) zero‐field splittings; D/hc=±0.0551(1) and E/hc=∓0.0042(1) cm−1; (2) spin densities: ρ1(α)=0.055, ρ2(β)=0.016, ρ5(γ)=0.217, ρ13=−0.025, and ρ15=−0.027; and (3) relative triplet population rates: px≊py≳pz.