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    Electric multipole moments of some diatomic molecules
    (2009) Sezer, M. Özgür; Özmen, Ayhan; Yüksel, Hüseyin
    Molecular Electric Multipole Moment (MEMM) integrals have been derived for diatomic molecular systems, and then some lower multipole moments as dipole moments and quadrupole moments have been calculated for some diatomic molecules. The calculations have been performed by using our analytical formula over Slater-Type orbitals (STOs) with Cade and Huo’s basis sets and the GAMESS program package working with Gaussian-Type basis sets (GTOs). The expressions which involve factorials are given in terms of binomial coefficients in order to speed up calculations. The results have been obtained in agreement with data found in the literature.
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    Investigation of radiation effects on coffee beans using esr technique
    (2018) Ece, Emel; Sezer, M. Özgür; Özmen, Ayhan; Sayın, Ülkü
    In this study, radiation effects on coffee beans have been investigated by Electron Spin Resonance (ESR) technique. ESR spectra of natural and irradiated samples at different doses between 0.5 Gy and 11 kGy by 60Co gamma source were recorded with X-band ESR spectrometer and, radiation dose, ESR microwave power and cavity temperature dependency of paramagnetic centers were investigated. At the results of dose- response and kinetic studies it was determined that the paramagnetic centers in coffee beans are stable, and sensitive to radiation. Thus, it is shown that the irradiated beans can be used for detection as radiation dosimeter in the investigated dose range.
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    Linear and Nonlinear Optical Absorption Coefficients and Binding Energy of a Spherical Quantum Dot
    (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2010) Çakır, Bekir; Yakar, Yusuf; Özmen, Ayhan; Sezer, M. Özgür; Şahin, Mehmet
    The binding energy and wavefunctions of the is, 1 p, 1d and if energy states of a spherical quantum dot (QD) with parabolic potential were calculated by using a method which is a combination of the quantum genetic algorithm (QGA) and the Hartree-Fock-Roothaan (HFR) approach. In addition, the linear and the third-order nonlinear optical absorption coefficients based on optical transitions in QDs with and without impurity were calculated. The results show that the parabolic potential has a great effect not only on the binding energies and but also on the optical absorption coefficients. Moreover, the calculated results also reveal that the linear and nonlinear optical absorption coefficients are strongly affected by the existence of impurity and the incident optical intensity.