Abstract
Abstract The second order Stark effect has been demonstrated on the phosphorescence microwave double resonance (PMDR) signals of p-benzoquinone in 1,4-dibromobenzene host at 1.6 K. It is shown that possible estimates of the zero-field parameters of the higher triplet state mixed by the field with the lowest triplet state can be determined from the observed Stark shift of the zero-field triplet spin transitions. Furthermore, by using polarized microwaves in the double resonance experiments, and from the anisotropy of the Stark effect on the PMDR signal, the direction of the transition moment to the state that is mixed by the field can also be determined.
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