Abstract
This paper reports the direct observation of level anticrossing and mixing effects between a pair of Zeeman sublevels of a phosphorescent triplet state using optical detection of magnetic resonance (ODMR) methods. By carrying out the ODMR experiment at resonance fields below, at, and above the avoided crossing point, direct measurements of the interaction ( V) which couples the two states have also been made. For 13C-benzophenone in a single crystal of 4,4′-dibromodiphenylether at 1.6 K, we find | V| = 30 MHz with H| z , but in other orientations and systems different values of V are obtained.
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