T. F. El-Essawy's research while affiliated with Benha University and other places
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Publications (3)
Type I FA (Rb+, Cs+) and II FA (Li+, Na+) tunable laser activities, adsorptivity and donor-acceptor properties of O and O− adsorbates at the flat surface of KCl crystal were investigated using an embedded cluster model and ab initio methods of molecular electronic structure calculations. Ion clusters were embedded in a simulated Coulomb field that...
An attempt has been made to examine FA(Ga+,In+,Tl+) tunable laser activity and adsorptivity of halogen atoms (F,Cl,Br,I,At) at the (001) surface of KCl crystal using an embedded cluster model, CIS and density functional theory calculations with effective core potentials. The ion clusters were embedded in a simulated Coulomb field that closely appro...
The two-fold potential of F2+ center at the low coordinated surfaces of AgBr thin films in providing tunable laser activity and photographic sensitization is investigated using ab initio methods of molecular electronic structure calculations. The explicitly considered clusters were embedded in simulated Coulomb fields that closely approximate the M...
Citations
... Exciton band E X , F band E F , E X À E F and AEE X À E F ae for twelve alkali halides have been reported by Malghani and Smith [19], and for LiH and LiF by Shalabi et al. [20]. The dependence of the Glasner-Tompkins relation on the impurity cation and surface coordination number (flat, edge and corner) of MgO, KCl and AgBr has also been reported by Shalabi et al. [21]. However no attempts have been made to clarify the dependence of the Glasner-Tompkins relation on the artificial polarization effects at RbCl (0 0 1) surface. ...
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... Ab initio calculations of laser light generation at the ionic crystal surface is still lacking, and until recently the potential of F A1 :Tl n+ (n = 1, 3) center systems for useful laser action at the (1 0 0) surface of NaCl has been ignored [4]. We have therefore carried out a fairly extensive set of ab initio calculations in an attempt to examine the role of oxidation states of Thallium in F A1 :Tl n+ (n = 1, 3) laser light generation at the (1 0 0) surface of NaCl. ...
