Spectral redistribution and dispersion anomalies in plasma-dressed(Formula presented) (Formula presented)under competing confinements
Physica Scripta, cilt.101, sa.36, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 101 Sayı: 36
- Basım Tarihi: 2026
- Doi Numarası: 10.1088/1402-4896/aea2dd
- Dergi Adı: Physica Scripta
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH
- Anahtar Kelimeler: dipole polarizability, endofullerene, he atom, oscillator strengths, quantum plasma, redistribution
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
Özet
In this work, the oscillator strengths and dynamic dipole polarizability of a helium atom, (Formula presented) (Formula presented), confined within a fullerene cage and simultaneously subjected to an impenetrable spherical confinement and a quantum plasma environment, are investigated. Although the intrinsic optical response of helium is highly limited due to its closed-shell (Formula presented) (Formula presented) electronic configuration, it is observed that the simultaneous presence of spherical confinement boundary conditions, fullerene cage parameters, and quantum plasma screening profoundly modifies the spatial localization of the wavefunctions and the energy spectrum, leading to a substantial redistribution of oscillator strengths among selected transitions and a pronounced transformation in the resonance structure of the dynamic polarizability. The quantum plasma environment is modeled using the exponential cosine screened Coulomb potential, while the fullerene cage is represented by a Woods–Saxon potential. The electronic structure is obtained using numerical methods within the Hartree–Fock approach under impenetrable spherical confinement boundary conditions. By systematically varying the confinement radius, fullerene parameters, and the plasma screening function, the oscillator strengths for selected dipole transitions are investigated, and the observed spectral redistributions are interpreted in physical terms. In addition, the frequency-dependent contribution of the (Formula presented) (Formula presented) electric dipole transitions to the dynamic dipole polarizability is analyzed in detail, and the systematic evolution of the resonance frequencies under these parameters is discussed.