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Temperature-dependent infrared-absorption measurements were performed on the spin orbit and trigonalcrystal-field split levels of the 4 T 1g cubic-field ground term of Co 2ϩ (3d 7 ) in the cadmium halides CdX 2 ͑X: Cl, Br, and I͒. Besides ␥ 4 ϩ →␥ 4 ϩ and ␥ 4 ϩ →␥ 5,6 ϩ electronic transitions, sharp vibronic lines are observed. From temperature-dependent line shift and line-broadening measurements of these lines, electron-phonon coupling parameters were determined. For Co 2ϩ in CdCl 2 , wheredoi:10.1103/physrevb.66.134303 fatcat:akwjoz4kdzavpba52zqnrbvgc4