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31.
Yaman A Bayrakçeken AB Demir OJ Bayrakçeken F 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2000,56(10):1901-1903
An ultraviolet absorption, as well as Stokes and anti-Stokes Raman resonance scattering of spectroscopically pure SiO2 was investigated by flash photolysis technique. The whole spectrum of 'absorption and scattered bands' was recorded photographically in ultraviolet. A resonance absorption line was observed at 288.2 nm, without structure, while scattered lines were observed at 285-288.2 and 288.2-290 nm. 相似文献
32.
The exact analytical solution of the Klein-Gordon equation for the spin-0 particles in the generalized Woods-Saxon potential is presented. The bound state energy eigenvalues and corresponding wave functions are obtained in the closed forms. The correlations between the potential parameters and energy eigenvalues are examined for π0 particles. 相似文献
33.
Exact Solutions of Klein--Gordon Equation with Scalar and Vector Rosen--Morse-Type Potentials 下载免费PDF全文
We obtain an exact analytical solution of the Klein Gordon equation for the equal vector and scalar Rosen Morse and Eckart potentials as well as the parity-time (PT) symmetric version of the these potentials by using the asymptotic iteration method. Although these PT symmetric potentials are non-Hermitian, the corresponding eigenvalues are real as a result of the PT symmetry. 相似文献
34.
Zıya Kantarci Celal Bayrak 《Journal of inclusion phenomena and macrocyclic chemistry》2003,45(1-2):59-67
The host complexes M(Cyclopentylamine)2Ni(CN)4 (M=Co or Cd) havebeen prepared in powder form. The spectral data suggest that the structures of thesecompounds are similar to those of the Hofmann-dma-type hosts. The absorptionand the liberation processes of the aromatic guests (benzene, toluene, 1,2-, 1,3-,1,4-dichlorobenzene, 1,4-dibromobenzene o-, m-, p-xylene, naphthalene)in these hosts have been examined at room temperature by gravimetric and spectroscopicmeasurements. The desorption of the benzene guest against time has been measured. Thehost structures do not change on inclusion and liberation of the guests. The host compoundshave been suggested as sorbents for isomeric separations. 相似文献
35.
Sevgi Bayari Celal Bayrak Ziya Kantarci 《Journal of inclusion phenomena and macrocyclic chemistry》2000,38(1-4):23-35
IR spectra of Mn(adenine)2M(CN)4.C6H6 (M=Cd or Hg), andIR and Raman spectra of Cd(adenine)2M(CN)4.C6H6(M=Cd or Hg) are reported. The spectral data suggest thatthe host frameworks of these compounds are similarto those of the Hofmann-Td-type and the adeninecoordination is via N(10). 相似文献
36.
Bayrakçeken F Ari F Telatar Z 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2005,62(4-5):1151-1156
High resolution S0-->Sn and T1-->Tn electronic absorptions and B-type delayed fluorescence of 1,2,7,8-dibenzanthracene in polymethylmethacrylate (PMMA) were experimentally observed by flash and laser flash photolysis technique. Dibenzanthracene (hereafter DBA) molecules were excited in a two-step process. In the first step, an excited singlet is created, which undergoes intersystem crossing to triplet state, then T-T absorption creates an excited triplet dibenzanthracene molecule, which returns to the first excited singlet level by intersystem crossing. The re-created first excited singlet of dibenzanthracene decays back to the ground state by emitting B-type of delayed fluorescence, which was observed at the same emission band of prompt (normal) fluorescence, and R-, E-, P-types of delayed fluorescences. For normal fluorescence, S1 state is decaying to S0 ground state. For E- and P-type of delayed fluorescences, T1 state is decaying to S0 via S1 state, and for B-type of delayed fluorescence, T2 state is decaying to S0 via S1 state. The spectrum image showing the absorption/emission bands mentioned was also examined by image processing techniques in order to improve the visual experience of each band by localizing to a specific region of interest (ROI). Experimental results illustrate how the exact location of emission/absorption bands was clearly extracted from the spectral image and further improvements in the visual detection of absorption/emission bands. 相似文献
37.
Bayrakçeken F 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,71(2):603-608
In principle the optical energy absorbed by a complex molecule raises that molecule to one of its excited states, and afterwards this excitation energy decays through the different relaxation channels. Initially, electronically excited benzophenone emits photons in the phosphorescence band of benzophenone and these emitted photons, as a stream of particles, are absorbed by the acceptor molecule naphthalene, then excited naphthalene phosphoresces. In this investigation, sensitized phosphorescence decay times in different conditions were measured for benzophenone-naphthalene system in the vapor phase. The ultraviolet-visible spectra of the system in the vapor phase at room temperature conditions were broad and structureless. 相似文献
38.
Davraz Metin Koru Murat Bayrakçi Hilmi Cenk Yusufoğlu Yusuf Ipek Osman 《Journal of Thermal Analysis and Calorimetry》2020,142(4):1377-1386
Journal of Thermal Analysis and Calorimetry - The reduction of radiation heat transfer in VIPs is an important issue. In VIPs, the radiation heat transfer is reduced by the use of opacifier.... 相似文献
39.
Bayrakçeken F 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2004,60(4):923-925
Ultraviolet light induced high resolution optical absorption spectra and resonance fluorescence of spectroscopically pure fused silica have been studied, due to its potential applications in optoelectronics and flash (laser flash spectroscopy laboratory use), for optical fibers and power optics and lasers. An ultraviolet discrete absorption spectra and resonance coherent fluorescence were recorded photographically between 200 and 260 nm. Resonance discrete and coherent fluorescence were observed at 250-255 and 220-225 nm bands at room temperature by flash photolysis technique. 相似文献
40.
Bayrakçeken F Aktaş S Toptan M Unlügedik A 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2003,59(1):135-138
High resolution absorption spectra of anisole and phenoxyl radical has been recorded in the vapor phase at room temperature by flash photolysis technique, and subsequent reactions have been investigated by kinetic spectroscopy. It was possible to follow the kinetics of the radical's decay which occurred predominantly by bimolecular recombination. The concentration of the phenoxyl radical calculated from the concentration of diphenoxyl molecules formed in the reaction cell during the optical pumping. The absolute extinction coefficient of this radical was measured from the absorption band at 291 nm, and found to be 0.95 x 10(+4) mol(-1) 1 cm(-1). 相似文献