Evaluation of Three Different Types of Spectroscopy Lab Report

Evaluation of Three Different Types of Spectroscopy - Lab Report Example The sample is then heated via flame, plasma or electricity; this causes desolvation, liquefaction, vaporization and finally atomization (Sagi & Rathnam, 2013). Components include; a) The light source which is usually a hollow cathode lamp. Atoms of different elements absorb specific wavelengths of light therefore in order to analyse a sample for a specific element, the light source used must correspond to the wavelength of that element. b) A compartment in which samples are atomised via (flame, graphite furnace, MHS cell, FIAS cell, FIMS cell). c) A monochromator that disperses the light. d) A detector, which measures the light intensity and amplifies the Signal. e) A display that shows the reading. AAS has various uses such as analysis of bodily fluids like blood and urine for heavy metal poisoning and monitoring of the environment by measuring levels of certain elements in lakes, food like fish and the air (Karabegov, 2011). Fluorescence is a photon emission process. Absorption of light by some molecules causes movement of electrons from the ground state to an excited state. This excited molecule will return to a lower energy level by dispersing part of its energy. It will then return to the ground state by emission of a photon (fluorescence). As a result of this loss of energy, stokes shift is observed. Stokes shift is when there is a difference in wavelength of the absorption and emission spectra (Ge, et al., 2010) Only molecules containing a functional group which has the ability to absorb energy of a certain wavelength and re-emit it at a different but specific wavelength (fluorophore) will exhibit fluorescence (Ge, et al., 2010) a) The light source, an example of the first type used is the tungsten-halogen lamp and later on, mercury lamps were used. However, now xenon lamps are mainly used. b) A Monochromator used to select both the excitation and emission wavelength. c) Sample holders, the cuvette is placed in

Existentialism is a Movement of the 20th Century Essay

Existentialism is a Movement of the 20th Century - Essay Example Kierkegaard is known to be the father of existentialism. He is also a highly known philosopher of the 19th century. Kierkegaard developed the idea of living life in a variety of stages. Aesthetical, ethical and religious were his divisions of life. In his work, he claimed that he went through similar experiences during his lifetime, and he used the stages to establish his own philosophy of life and of human existence. He assessed the first two stages with regard to the normal set of beliefs and behavior. However, the last stage developed based on personal and non-rational opinion â€Å"leap of faith† (Cooper 517). The aesthetical stage was characterized by immediacy and failure, to reflect with seriousness upon the nature of a person’s life. The people in this stage were defined as like material things and fulfilling their desires as they occurred. People become slaves to their senses and they tend to want to fulfill desires propelled by their senses. People would tend to fulfill needs they consider appropriate and other people’s opinion did not count. The stage represents two types of lifestyles; reflective and non-reflective immediacy. Alcohol, sex and drugs are some illustrations of satisfying unrefined immediacy. An individual act without thinking because the satisfaction expected does not require thinking, refined immediacy, on the other hand, characterized by thoughtful planning (Cooper 518). Sometimes people think before undertaking a certain action, but the thoughts do not put into consideration moral and ethical values. Reflection of the lifestyle embarked not put into consideration. Planning made in order to gain full satisfaction of the lifestyle. According to Kierkegaard this pleasures of life will eventually vanish, and an individual will be caught in a moment of despair (Kierkegaard n. p). In the end, one will get tired of the life of luxury and satisfaction would hardly be achieved.