Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8522Feasibility of Multidimensional Fluorescence at Low Temperature in Shpol'skii Matrices Combined with PARAFAC for the Quantitation of Polycyclic Aromatic HydrocarbonsOlga Monago-Marana, Arsenio Munoz de la Pena, Maha Al-Tameemi, Teresa Galeano-Diaz and Andres D CampigliaAbstractThe feasibility of determination of four polycyclic aromatic hydrocarbons (PAHs), using multidimensional fluorescence at low temperature in Shpol'skii matrices, was addressed in this work. Excitation - Emission Matrices (EEMs) at low temperature (77 K) were obtained, using an optimized optic fiber consisted of two delivery and eight collection fibers, with an eight-around-two configuration.a |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8521Spectrometric Studies on Sodium Nitroprusside and its Interaction with HSA upon PhotoirradiationLifang Liu, Zhiou Ma, Leilei Xie, Xiaolu Wang, Wenming Wang and Hongfei WangAbstractSodium nitroprusside (SNP, Na2[Fe(CN)5NO]ยท2H2O) has been widely applied clinically as a vasodilator and a drug by releasing NO. In this work, photo-induced NO release from SNP was investigated using electron paramagnetic resonance spectroscopy and the spin trapping shows a characteristic triplet signal of NO free radicals. The dynamic process and mechanism of NO release from SNP upon photoirradiation were further analyzed using time-resolution infrared spectroscopy technology. |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8520Deep and Shallow Core Excitation and Ionization of Atoms and MoleculesACF SantosAbstractThis paper reviews the current status of core excitation and ionization spectroscopy studies of isolated atoms or molecules using synchrotron radiation. Experimental results are discussed for Ne 1s, Ar 1s, Kr 2s, Cl 2p, and S 1s, excitation and ionization. Charge state spectra of free atomic and molecular ions generated after ionization or excitation (by a single photon) of shallow or deep shells are reviewed by using the PEPICO technique. |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8519Principles of High-Resolution NMR Spectroscopy of Paramagnetic Molecules in SolutionsVK VoronovAbstractThe review summarizes the peculiarities of NMR phenomenon in paramagnetic molecules. These peculiarities are due to hyperfine or electronic coupling between the unpaired electrons and the resonant nuclei that leads to the paramagnetic broadening as well as to the paramagnetic shifts (contact and pseudocontact) of resonance lines in NMR spectra. The contact shift is observed when a probability of the unpaired electron disposition in the location of resonance nucleus is different from zero. |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8518Stability of Polytetrafluoroethylene, Polyethylene, and Polystyrene Pellets as a Matrix for Analytical Terahertz SpectroscopyMichaella E Raglione, Tianyao Zhang and Mark A ArnoldAbstractResults are reported for a detailed examination of polytetrafluoroethylene (PTFE), polyethylene (PE) and polystyrene (PS) as polymeric matrixes for preparing sample pellets for analytical terahertz (THz) spectroscopy. Individual pellets were prepared from each material by compression at five tons of pressure under ambient temperatures. Mass, diameter, thickness, porosity and THz spectra were measured daily for each pellet over a period of four days. |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8517Spectroscopic Approach for Characterization of Archaeological Potsherds Excavated from Some Neolithic Sites from SudanFatima Elbashir Siddig, Abdalla Ahmed Elbashir, Verena Lepper and Ahmed HusseinAbstractIn this paper multi-spectroscopic techniques for characterization of ancient potsherds excavated from different Neolithic sites (Esh-shaheinab, Kadero and Jebel-Um-Marahi), Sudan were reported. The experimental data inform us to the both elemental and mineralogical composition of the potsherds. Mineralogical composition of ancient pottery has been studied by both FTIR and XRD approaches. Further, studies by Thermogravimetric analysis (TGA) to indicate the firing temperature from typical thermal reaction in potsherds samples. Scanning Electron Microscopy (SEM) coupled with an Energy Dispersive Spectrometer (EDS) was used to study the internal morphology and chemical composition of the pottery. EDS was performed to figure out the elemental composition and the resultants were carried out statistically utilizing the ratio of SiO2 to Al2O3 due to their non-volatile character. |
Research Article | Volume 3, Issue 2 DOI: 10.35840/2631-505X/8516(Cuinse2)1-X (Tase)X Solid Solutions (0 < X ≤ 0.5): X-Ray Diffraction, Scanning Electron Microscopy, Differential Thermal Analysis and Magnetic SusceptibilityP Grima-Gallardo, L Mendez, GE Delgado, H Cabrera, E Perez-Cappe, I Zumeta-Dube, A Rodriguez, JA Aitken and DP RaiAbstractPolycrystalline samples of the (CuInSe2)1-x (TaSe)x system were prepared by the melt and anneal technique in the composition range 0 < x ≤ 0.5. Products were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Differential Thermal Analysis (DTA) and SQUID techniques. From XRD and SEM, it was found that the solubility of TaSe in CuInSe2 is around 10%; however, samples up to x = 0.5 are composed by a mean tetragonal CuInSe2-like phase with traces of TaIn0.67Se2. |
