Abstract

The infrared spectra of monomeric and dimeric magnesium chloride and monomeric magnesium bromide trapped in solid argon at 4 to 10°K have been obtained. For the monomer MgCl₂, two band systems were observed at 603 and 585 cm⁻¹. The two bands appear to result from different matrix sites. For the MgBr₂ monomer an intense band system was observed in the region 490 to 530 cm⁻¹ with three strong bands at 592, 509, and 520 cm⁻¹ and shoulders at 495 and 526 cm⁻¹. The origin of these observed multiplets is uncertain but may also result from different matrix sites. For the dimer Mg₂Cl₄, bands were observed at 504, 410, and 515 cm⁻¹. These frequencies are shown to be consistent with an assumed chlorine bridged structure.

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