Browsing by Author "Lomlu, Rana"
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Item Open Access Franck-Condon factors in electronic excitations from the ground and excited vibrational states are different(American Chemical Society, 2023-05-11) Biçer, Ömer Faruk; Lomlu, Rana; Katmer, Fatmagül; Süzer, ŞefikVibrational fine structure observed in the published He-I UV photoelectron spectra of H2 and N2 molecules recorded at room temperature and under microwave excitation or at 700 °C have been reexamined and compared with calculations of the Franck-Condon factors (FCFs) using simple harmonic oscillator wave functions and/or those obtained using Morse potentials. In general, FCFs are used to explain vibronic transitions of molecules observed in the UV-vis and photoelectron spectra of diatomic and polyatomic molecules, which can be computed using differing levels of complexity. We advocate constructing the vibrational wave functions numerically, rather than analytically, with the help of a program such as Excel, Origin, or Python. In this way students can also verify the normalization and orthogonality of the wave functions using numerical integration routes provided within these programs. Special attention is drawn to possible deviations of the FCFs of the vibrationally excited molecules from those of the ground states.Item Embargo Tunable photocatalytic activity of CoFe Prussian blue analogue modified SrTiO3 core–shell structures for solar-driven water oxidation(American Chemical Society, 2023-12-18) Peighambardoust, N. S.; Sadigh Akbari, Sina; Lomlu, Rana; Aydemir, U.; Karadaş, FerdiThis study presents a pioneering semiconductor-catalyst core–shell architecture designed to enhance photocatalytic water oxidation activity significantly. This innovative assembly involves the in situ deposition of CoFe Prussian blue analogue (PBA) particles onto SrTiO3 (STO) and blue SrTiO3 (bSTO) nanocubes, effectively establishing a robust p–n junction, as demonstrated by Mott–Schottky analysis. Of notable significance, the STO/PB core–shell catalyst displayed remarkable photocatalytic performance, achieving an oxygen evolution rate of 129.6 μmol g–1 h–1, with stability over an extended 9-h in the presence of S2O82– as an electron scavenger. Thorough characterization unequivocally verified the precise alignment of the band energies within the STO/PB core–shell assembly. Our research underscores the critical role of tailored semiconductor-catalyst interfaces in advancing the realm of photocatalysis and its broader applications in renewable energy technologies.Item Restricted Türkiye'nin ilk nükleer reaktörü: TR-1(Bilkent University, 2020) Peker, Dilşad Simay; Kırmacı, Selin; Karaca, Kaan; Lomlu, RanaTürkiye'nin ilk reaktörü olan TR-1 hakkında olan bu araştırma yazısı TR-1'in açılma kararından başlayarak kuruluş süresini, aktif yıllarındaki çalışmalarını ve kapanış sürecini sosyal, siyasi ve ekonomik olarak detaylı bir şekilde incelemektedir. Bu süreçlerde karşılaşılan problemlere, halkın bakış açısına, kapanış nedenlerine ve Türkiye'nin gelişimine katkısına da değinen bu yazı TR-1'den sonra nükleer alanında yapılan çalışmaları da anlamak için bir ışık tutmaktadır.