Frequency Shifts Calculated at High Pressures (ε–ζ Transition) in Solid Oxygen
Acta Physica Polonica A, cilt.149, sa.6, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 149 Sayı: 6
- Basım Tarihi: 2026
- Doi Numarası: 10.12693/aphyspola.149.208
- Dergi Adı: Acta Physica Polonica A
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, Directory of Open Access Journals, Academic Search Ultimate (EBSCO)
- Anahtar Kelimeler: mode Grüneisen parameter (γT), Vinet equation of state (EOS) (V-P relation), ε-ζ (δ-ε) transition, ν-P relation
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet
Özet
The pressure dependences of the Raman and infrared frequencies are predicted using a relation derived from the Vinet equation of state, which uses the mode Grüneisen parameter (γ__T) for the ε–ζ transition in solid oxygen. For this calculation, the observed data for V–P and ν–P are taken from the literature. The Grüneisen parameter of the Raman vibron calculated by us increases with increasing pressure because the observed Raman frequencies of this vibron increase. For the infrared modes, γT exhibits a nearly symmetrical profile (ν_ FIR) and λ-type behaviour (ν_ MIR) for the δ–ε transition (in the ε phase) in solid oxygen. Our calculated frequencies for the Raman and infrared modes agree with the observed data, which indicates that the modified ν–P relation can be used to predict frequencies close to phase transitions in various molecular crystals.