Vibrational spectra of solid hydrogen iodide—a lattice dynamics study

✍ Scribed by W. Y. Zeng; Y. Z. Mao; A. Anderson

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 88 KB
• Volume: 30
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199911)30:11<995::aid-jrs475>3.0.co;2-x

✦ Synopsis

The vibrational spectra of crystalline hydrogen iodide and its deuterated analogue in their low-temperature ordered phase were computed using a simple force constant model. The results are compared with experimental Raman and infrared data, and satisfactory agreement is obtained for the lattice modes and the crystal field splittings of the internal modes. Comparison with the other hydrogen halides shows that the halogen-halogen nearest neighbour interactions are more important for the iodide, whereas hydrogen bonding between molecules plays a less dominant role. As a result, the iodide adopts a different structure to the other three halides at low temperatures.