In a Jablonski diagram, we have singlet and triplet excited states where spin is conserved or changed, respectively. My book says any singlet excited state is found to have higher energy than the corresponding triplet state from the same electron configuration. Why is that?
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What is the physical basis for Hund's first rule? – orthocresol Apr 19 '17 at 18:45
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It is true experimentally that the triplet state arising from the same configuration as the singlet is of lower energy, the answer to this question gives some explanations https://chemistry.stackexchange.com/questions/58625/what-is-the-physical-basis-for-hunds-first-rule/58654#58654 – porphyrin Apr 20 '17 at 08:48