Absorption & Emission of Light Stimulated Absorption & Emission‚ Spontaneous Emission E2 Incident radiation hν hν Emitted & transmitted radiation E1 Resonance condition E2-E1=hν • Rate of stimulated emission is: −dN1/dt = N1B1->2 ρ(ν) • Rate of absorption is the sum of the rated due to stimulated emission and spontaneous emission: −dN2/dt = N2B2->1 ρ(ν) + N2A2->1 where B1->2 is the Einstein transition probability for induced absorption‚ B2->1 is the Einstein transition probability
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Application of Fluorescence Spectroscopy in Chemical Oceanography: Tracing Colored Dissolved Organic Matter (CDOM) Erika Mae A. Espejo 3rd year‚ BS Chemistry‚ University of the Philippines‚ Diliman Abstract Dissolved organic matter (DOM)‚ the fraction passing through a 0.45 µm membrane filter‚ is considered poorly understood mixture of organic polymers because of its complexity. Although it largely influences a lot of biogeochemical processes in aquatic environments‚ its characterization is not
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------------------------------------------------- Nuclear power From Wikipedia‚ the free encyclopedia "Atomic Power" redirects here. For the film‚ see Atomic Power (film). This article is about the power source. For nation states that are nuclear powers‚ see List of states with nuclear weapons. The Susquehanna Steam Electric Station‚ a boiling water reactor. The reactors are located inside the rectangular containment buildings towards the front of the cooling towers. Three nuclear-powered
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BEER’S LAW EXPERIMENT 3 Amanda Buchanan – September 20‚ 2015 Chemistry 1212 – Section 50 OBJECTIVES: The objectives of this experiment are to understand why and how spectroscopy is used to determine the components and concentrations of a solution‚ describe various types of spectroscopy‚ describe the visible and ultraviolet regions of the electromagnetic spectrum‚ define Beer’s law and define the relationship between absorbance and transmittance. Other learning objectives are to create a Beer’s
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Absorption Spectroscopy Author: Lab Partners: Instructor: Chem 152 Date Work Performed: Date Work Submitted: Abstract A Beer’s Law analysis was used to determine the molar absorptivity of a Red-40 food dye. Using a spectrometer‚ the best wavelength to use for the analysis of this dye was determined to be 501nm. A series of dilutions were performed and the concentrations were calculated to find ‘E‚’ the molar absorptivity‚ which was determined to be 18035 M-1 cm-1. Introduction
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2.7 Raman spectroscopy Principle: Raman spectroscopy is based on the use of a laser light to induce oscillation and rotation in human fluids containing glucose. Because the emission of scattered light is influenced by molecular vibration‚ it is possible to estimate glucose concentration in human fluids [24]. This effect depends on the concentration of the glucose molecules. This technique can measure very weak signals‚ even in human fluids. The wavelength range of Raman spectrum is considered to
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Assignment: Atomic Theory 1. Write the complete symbol and determine the no. of electrons‚ protons and neutrons of the following e- p+ n a.) Oxygen - 8 8 b.) Cesium - 55 55 c.) Argon - 18 18 d.) Uranium - 92 92 e.) Copper - 29 29 2. Calculate the atomic mass of sulfur from its natural isotope. f.) Sulfur-36 g.) Sulfur-32 h.) Sulfur-33 i.) Sulfur-34 3. Complete this table. Symbol of Elements | Atomic Number | Atomic Mass | #
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The University of the West Indies (Mona) Department of Chemistry Preliminary Chemistry A (Chem 0901) Atomic Structure: Tutorial 2 For discussion in the week beginning September 24‚ 2012. Answers should be submitted by 9:00 am on Monday September 24‚ 2012 in the box provided. Please write your ID number and Laboratory day clearly on your script. 1. Give an expression for the Balmer-Rydberg equation in terms of wavelength λ‚ the Rydberg constant R‚ and the integers m and n where m < n.
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first country to use an atomic bomb on another country‚ and the U.S. is still the only country to have ever used an atomic bomb. The U.S. dropped the atomic bomb on Hiroshima‚ Japan on August 6‚ 1945 and dropped another atomic bomb on Nagasaki‚ Japan on August 9‚ 1945. 70‚000 died instantly in Hiroshima and 80‚000 died instantly in Nagasaki. Even though the U.S. destroyed many Japanese lives the atomic bombing of Hiroshima was the right decision. However dropping the second atomic bomb on Nagasaki was
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ATOMIC PHYSICS The nuclear atom All matter is made up of atoms which consist of a central nucleus‚ surrounded by electrons. Inside the nucleus are protons and neutrons. Particle Relative mass Charge Location Proton 1840 + Nucleus Neutron 1840 0 Nucleus Electron 1 - Outside nucleus Proton or atomic number (Z) This is the total number of protons in the nucleus of an atom. Nucleon or mass number (A) This is the total number of protons and neutrons in the nucleus of an atom. Note: a nucleon
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