Abstract
Magnetic optical activity in resonance Raman spectra of IrB 2− 6 are reported. Couplets are observed in all three Raman fundamentals (A 1g, E g and T 2g) at 514.5 nm, but only in A 1g at 577.5 nm. These originate in transitions between Zeeman levels of the Kramers-degenerate ground state. From the absolute sign in the A 1g band, the isotropic g factor is confirmed to be negative.
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