Abstract

Using a fully deuterated sample of benzophenone, optically detected ENDOR transitions reveal line splittings due to deuterium quadrupole interaction in the excited triplet state. The line splittings were used to determine the ring-carbonyl-ring bond angle 2θ = 138(1.5)° and the phenyl-ring twist ansle ψ = 28.5(1.5)° of benzophenone in its metastable excited state.

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