Spectroscopy

The purpose of this experiment was to determine a series of external standards using Atomic Absorption (AA) and Flame Atomic Emission (FEA) spectroscopy. The principles of Atomic Absorption spectroscopy relies on the ability to distinguish one atom from another with great sensitivity as explained in Quantitative Chemical Analysis by Daniel Harris1. Specifically, this high precise determination can be achieved when specific wavelength of light is generated by a hollow-cathode lamp. The light emitted

Introduction: The purpose of this experiment is to analyze the efficacy and accuracy in determining mass composition of copper in a penny using two methods: atomic absorption spectroscopy and ultraviolet-visible spectroscopy. The “Copper” Penny The penny is a common form of currency used in the United States, holding the monetary value of one cent. From 1793 to 1837 the penny was composed of pure copper. As the years passed, the percent composition of copper in the penny decreased. From 1837 to

8) As we know in UV spectroscopy the sample is between the source and the detector. So the light starts from the source and goes through the sample and ends in the detector. On the other hand in fluorescence spectroscopy the light is imparted at all angle as a result the detector misses a lot of light. This is a reason that fluorescence spectroscopy is more sensitive that UV spectroscopy. 9) As previously mentioned after absorbing energy an electron can jump from the ground state (lowest energy)

is that they can be destructive, lengthy, and expensive. Additionally, these methods may not be able to identify bone when it is highly fragmented or altered. Therefore, chemical analysis techniques such as HHXRF, XRF, SEM/EDS, PIXE, and Raman Spectroscopy have been proposed for differentiating bone and teeth from non-skeletal material and human from nonhuman skeletal material. Although their use is sporadic and dependent on instrument availability, these chemical techniques have proven valuable

and forensic chemists have been able to achieve this through processes such as spectroscopy and chromatography which both analyse the way that materials react when added to differing stimulants (Smith, Gould, Monteath & Smith, 2006). With chromatography forensic chemists react a sample with a controlled solvent which is then passed through to a column and detector which is sent through to the chromatogram. Spectroscopy describes the way that a sample reacts with electromagnetic radiation which will

anti-oxidative, anti-inflammatory, anti-carcinogenic, and antimicrobial, etc. In this work we have analysed the interactions of rutin with normal human hemoglobin (HbA) using UV-Visible spectroscopy, steady state fluorescence spectroscopy, time-resolved fluorescence spectroscopy, synchronous fluorescence spectroscopy and molecular modeling studies. Specific interactions of the flavonoid, Rutin, with human hemoglobin has been confirmed from flavonoid-induced static quenching which is evident from steady-state

Explosives are used for a variety of applications from military operations to mining. However, these materials can also be used in criminal investigations such as terrorists who threaten harm or cause death and destruction. Explosives can be categorised into two main forms: high explosives and low explosives. High explosives are explosive materials that detonate. This means that the explosive shock passes through the material at a speed, faster than the speed of sound. High explosives generally

after γ irradiation xxxxxxxxx Abstract In this paper, PVA-AgNO3 films were prepared by casting method. Then irradiated with different gamma doses (25, 50, 75, 100, 125 KGy). UV–visible spectroscopy, scanning electron microscope, EDX and photoluminescence spectroscope were used to characterize the prepared films. UV–visible absorption spectra showed a peak at 200 nm for PVA. And a peak at 427 nm for the surface plasmon resonance of silver

different forms. These unique characteristics were influenced by the quality and physical properties of the Na-doped CuO nanoparticles and these were strongly related to the preparation method. 3.4.2. Diffuse photoluminescence spectroscopy The photoluminescence (PL) spectroscopy was used to investigate the electronic and optical properties of nanoparticles as well as to elucidate the energy levels within the band gap region corresponding to the defect sites. Fig. 9 shows room temperature PL spectra

Questions raised: What is the exact technology used to examine the objects in the article? Why did they choose the artifacts in the article specifically? How were they able to figure out the gilding methods? Vocabulary list: 1. photoelectron spectroscopy (XPS)- measuring the chemical composition of an object by the energy of electrons freed from the surface by a laser. (Merriam Webster) 2. secondary ion mass spectrometry (SIMS) -A machine uses primary ions to push the ions in the object to the