Table 2.

Energies of Each Magnetic/Inter-Kramers-Doublet Transition^a

transition	energy (cm−1) by the “hotband” method30	energy (cm−1) from the current workb
±15/2 → ±13/2 (ν1)	110	104 (far-IR/INS)
±15/2 → ±11/2 (ν2)	190	approximately 180(5) (far-IR)
±15/2 → ±9/2 (ν3)	245	245 (far-IR)

^aThe ±15/2 → ±7/2 transition (ν₄), observed at 327 cm⁻¹ by the indirect “hot-band” optical absorption technique, appears to be at 285 cm⁻¹ in the FIRMS spectra (Figure S7).

^bThe errors for the energies are estimated to be ca. 1 cm⁻¹ (Supporting Information).