Tetrahedral crystal field splitting (Δₜ) (Td splitting smaller than Oh; e set lower, t2 higher (inverted pattern vs Oh naming))

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Td splitting smaller than Oh; e set lower, t2 higher (inverted pattern vs Oh naming)

What each symbol means

SymbolWhat it stands for
\Delta_tTetrahedral crystal field splitting parameter

When to use this

Approximate ratio Δt/Δo = 4/9 for same metal and ligands at same distance — JEE uses this factor often.