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Topic: Atomic spectroscopy


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  Atomic spectroscopy - Wikipedia, the free encyclopedia
Atomic spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum.
In optical spectroscopy, the energy absorbed to move an electron to a more energetic level and/or the energy emitted as the electron moves to a less energetic energy level is in the form of a photon (a particle of light).
Atomic mass spectrometry is similar to ther types of mass spectrometry in that it consists of an ion source, a mass analyzer, and a detector.
en.wikipedia.org /wiki/Atomic_spectroscopy   (804 words)

  
 Spectroscopy - Wikipedia, the free encyclopedia
Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency.
Spectroscopy is often used in physical and analytical chemistry for the identification of substances, through the spectrum emitted or absorbed.
Raman spectroscopy uses the inelastic scattering of light to analyse vibrational and rotational modes of molecules.
en.wikipedia.org /wiki/Spectroscopy   (1727 words)

  
 CHP - Atomic Emission Spectroscopy   (Site not responding. Last check: 2007-10-08)
Atomic emission spectroscopy (AES or OES [optical emission spectroscopy]) uses quantitative measurement of the optical emission from excited atoms to determine analyte concentration.
As in AA spectroscopy, the sample must be converted to free atoms, usually in a high-temperature excitation source.
Since the atomic emission lines are very narrow, a high-resolution polychromator is needed to selectively monitor each emission line.
www.chem.vt.edu /chem-ed/spec/atomic/aes.html   (279 words)

  
 Encyclopedia: Atomic absorption spectroscopy   (Site not responding. Last check: 2007-10-08)
Atomic absorption spectroscopy in analytical chemistry is a technique for determining the concentration of a particular metal element within a sample.
Atomic Absorption Spectroscopy can be used to analyse the concentration of over 62 different metals in a solution.
Atomic Absorption Spectroscopy was first developed during the 1950's by a team of Australian chemists, lead by Alan Walsh, working at the CSIRO (Commonwealth Science and Industry Research Organisation) Division of Chemical Physics, in Melbourne Australia.
www.nationmaster.com /encyclopedia/Atomic-absorption-spectroscopy   (1162 words)

  
 Atomic absorption Spectroscopy
Atomic absorption methods measure the amount of energy (in the form of photons of light, and thus a change in the wavelength) absorbed by the sample.
Atomic absorption analysis involves measuring the absorption of light by vaporized ground state atoms and relating the absorption to concentration.
Atomic absorption spectrometry is a fairly universal analytical method for determination of metallic elements when present in both trace and major concentrations.
weather.nmsu.edu /Teaching_Material/soil698/Student_Reports/Spectroscopy/report.htm   (1829 words)

  
 JCE 2000 (77) 577 [May] Atomic Emission Spectroscopy--It Lasts and Lasts and Lasts
Atomic emission spectroscopy, probably the first of the spectrometric methods to be used for elemental analysis, is still among the most popular.
Flame emission spectroscopy is the technique of choice for determining alkali metals in many clinical samples, and the high-voltage spark is the mainstay for quantitation in the metals industry.
Direct-current arc spectroscopy is routinely utilized for the characterization of recycled alloys, the inductively coupled plasma is used in laboratories throughout the world for solution samples, and the microwave plasma finds use as a chromatographic detector.
jchemed.chem.wisc.edu /Journal/Issues/2000/May/abs577.html   (417 words)

  
 CHP - Atomic-Absorption Spectroscopy
Atomic-absorption (AA) spectroscopy uses the absorption of light to measure the concentration of gas-phase atoms.
Applying the Beer-Lambert law directly in AA spectroscopy is difficult due to variations in the atomization efficiency from the sample matrix, and nonuniformity of concentration and path length of analyte atoms (in graphite furnace AA).
AA spectroscopy requires that the analyte atoms be in the gas phase.
www.chem.vt.edu /chem-ed/spec/atomic/aa.html   (394 words)

  
 Untitled Document
Quantum effects in atomic radiation, which are distinct from semiclassical theories, arise when it is essential to quantize the electromagnetic field, and it is well known that they were central to early discussions of the manifestation of the vacuum fluctuations characteristic of quantum fields.
In recent years quantum spectroscopy has become of interest not only for the basic understanding of complicated quantum structure of atomic systems, but also because it lies at the heart of such important applications as the high resolution spectroscopy and atomic clocks.
Quantum-limit spectroscopy lies at the frontier of current experimental and theoretical techniques, and is one of the areas of atomic spectroscopy where the quantization of the sources (atoms) and the field is essential to predict and interpret the existing experimental results.
www.physics.uq.edu.au /people/ficek/newbook.htm   (862 words)

  
 Atomic-Fluorescence Spectroscopy   (Site not responding. Last check: 2007-10-08)
Atomic fluorescence is the optical emission from gas-phase atoms that have been excited to higher energy levels by absorption of electromagnetic radiation.
Because of the differences in the nature of the energy-level structure between atoms and molecules, discussion of laser-induced fluorescence (LIF) from molecules is found in a separate document.
The atomic fluorescence is dispersed and detected by monochromators and photomultiplier tubes, similar to atomic-emission spectroscopy instrumentation.
elchem.kaist.ac.kr /vt/chem-ed/spec/atomic/afs.htm   (176 words)

  
 Basic energy considerations (from spectroscopy) --  Encyclopædia Britannica
A basic understanding of atomic structure is necessary for the study of resonance ionization (see above Foundations of atomic spectra: Basic atomic structure).
As presented to the U.S. Congress, the plan included a broad-based tax on nearly all forms of energy, with the level of the tax to be determined by the heat content of the various...
It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
www.britannica.com /eb/article-80656   (886 words)

  
 NEW ATOMIC SPECTRA from SOLIDS by BHARAT RADIATION
On the other hand, nuclear and atomic scientists aware of the fact that ionizing radiation emission is the result of core excitation of XRF sources and radioisotopes but unaware of successive valence excitation within the same excited atom.
XRF sources and radioisotopes causing atomic spectra is that they constitute isolated free atoms surrounded by unexcited atoms in ground state independent of their physical nature and temperature.
ATOMIC STATE OF Valence excitation by Bharat radiation causing a new type of atomic spectra from XRF sources and radioisotopes dealt in websites edas and discovery4 is the basis for the following hypothesis.
www.geocities.com /raomap/discovery5.html   (2672 words)

  
 Atomic Absorption Spectroscopy   (Site not responding. Last check: 2007-10-08)
Atomic absorption spectroscopy (AAS) is the measurement of an absorption of optical radiation by atoms in the gaseous state.
Sample cell - Where an atomic sample vapor is generated in the light beam from the source.
This is usually done by introducing the sample into a burner system (Flame AAS) or electrically heated furnace or platform, aligned in the optical path of the spectrophotometer.
www.chemistry.nmsu.edu /Instrumentation/AAS1.html   (202 words)

  
 Atomic spectroscopy and lasers (from atom) --  Encyclopædia Britannica   (Site not responding. Last check: 2007-10-08)
The energy levels of atoms are studied by measuring the wavelengths of light emitted by the atoms in excited states.
More results on "Atomic spectroscopy and lasers (from atom)" when you join.
Atomic physics has proved to be a spectacularly successful application of quantum mechanics, which is one of the cornerstones of modern physics.
www.britannica.com /eb/article-48374   (763 words)

  
 Atomic Absorption Spectroscopy
Atomic absorption absorption spectroscopy (AA or AAS) is one of the commonest instrumental methods for analyzing for metals and some metalloids.
Since the basis for the AAS process is atomic ABSORPTION, the monochromator seeks to only allow the light not absorbed by the analyte atoms in the flame to reach the PMT.
The signal is therefore a decrease in measure light: atomic absorption spectroscopy.
www.shsu.edu /~chemistry/primers/AAS.html   (1209 words)

  
 JCE Software, 5B1: Atomic Spectroscopy
Atomic Spectroscopy has been designed to introduce students to the principles of the emission spectra of simple gas-phase atoms and ions, including several one-electron species.
The program consists of modules that permit a student to: determine and record spectra via a simulated experiment; magnify, measure, and record wavelengths of spectral lines; compare two spectra; do spreadsheet-like calculations on wavelength values; and construct an energy-level diagram and test it against experimental observations.
The Atomic Spectroscopy requires a Color Graphics Adapter (CGA) or compatible graphics, and a color monitor is recommended.
jchemed.chem.wisc.edu /JCESoft/Issues/Series_B/5B1/prog2-5B1.html   (313 words)

  
 Wiley::Lasers in Analytical Atomic Spectroscopy
Lasers in Analytical Atomic Spectroscopy Edited by Joseph Sneddon • Terry L. Thiem • Yong-Ill Lee This book focuses primarily on the use of lasers in analytical atomic spectroscopy with optical detection, and also includes a chapter describing the use of lasers in inductively coupled plasma—mass spectroscopy (ICP—MS).
The book begins with a brief introduction to atomic spectroscopy and lasers, providing the reader with basic theory and information on instrumentation in conventional atomic spectroscopy.
Lasers in Analytical Atomic Spectroscopy will be of interest to spectroscopists, analytical chemists, and graduate students in these areas.
www.wiley.com /WileyCDA/WileyTitle/productCd-0471186236.html   (290 words)

  
 Theoretical Atomic Spectroscopy - Cambridge University Press   (Site not responding. Last check: 2007-10-08)
Atomic spectroscopy continues to be one of the most important subjects of contemporary physics.
The book describes the contemporary state of the theory of many-electron atoms and ions, the peculiarities of their structure and spectra, the processes of their interaction with radiation, and some of the applications of atomic spectroscopy.
Primarily a reference for researchers and graduate students in atomic physics and physical chemistry, this work will also be of value to physicists and chemists in other areas who use spectroscopy in their work.
www.cup.cam.ac.uk /catalogue/catalogue.asp?ISBN=052144425X   (571 words)

  
 [No title]
The theory of atomic absorption spectroscopy, a description of how the instrument enables the measurement of absorbance to be made in the flame, and the possible sources of error should be discussed in the introduction.
Since theoretically atomic absorption spectroscopy is based upon Beer’s Law, a linear relationship, include in your discussion why we use the non-linear parameter.
In the Conclusions section, compare the applicability of atomic absorption spectroscopy for elemental metal analysis to other common methods of analysis along with any conclusions you can draw from your experimental results.
pages.pomona.edu /~wsteinmetz/chem160/AASlabmanual.doc   (3072 words)

  
 Plasma Laboratory at Weizmann Institute of Science
The use of the hot and dense plasmas for X-ray lasers and the use of intense X-ray sources for high-resolution microscopy of living biological cells are considered as well.
The diagnostic methods are based on fast high-resolution plasma spectroscopy of spontaneous emission in the region from visible to X-rays and spectroscopy of laser absorption and laser-stimulated emission.
Theoretical analysis of the experimental data is based on detailed modeling of atomic physics processes that govern the atomic/ionic spectral line broadening, atomic level splitting under electric and magnetic fields, field ionization, multiple ionizations and time-dependent collisional-radiative calculations.
plasma-gate.weizmann.ac.il   (259 words)

  
 Atomic Physics on the Internet
Atomic Collisions and Spectroscopy Laboratory at the University of Connecticut, Storrs
Atomic and Molecular Physics and Atom Optics and Quantum Optics Laboratory at the University of Texas, Dallas
Atomic and Molecular Optics at the University of Wyoming
plasma-gate.weizmann.ac.il /API.html   (1405 words)

  
 Atomic Physics Links   (Site not responding. Last check: 2007-10-08)
Atomic Collisions and Plasmas at TU Wien (Austria)
Atomic, Molecular and Optical Physics at the College of William and Mary
Atomic and Molecular Physics from Elsevier Science B.V. Atomic and Molecular Physics from IOP Publishing Ltd.
www-phys.llnl.gov /N_Div/atomic.html   (211 words)

  
 Atomic Spectroscopy   (Site not responding. Last check: 2007-10-08)
The study of atomic spectra is one of the oldest research topics in "modern" physics.
Theoretical descriptions of atomic spectra may be found in a number of books dedicated to the topic, and introductory discussions are available in the beginning textbooks of quantum mechanics.
Many of the features of atomic spectra can be explained using relatively simple quantum mechanics.
landau1.phys.virginia.edu /classes/317.gbh.fall04/atom_spec/atom_spec.html   (1419 words)

  
 Atomic Absorption and Atomic Spectroscopy Resource   (Site not responding. Last check: 2007-10-08)
Single molecule absorption spectroscopy can enhance molecular analysis, surface manipulation, and studies of molecular energy and reactivity at the atomic level.
In this paper, on-line UV photooxidation by peroxodisulfate was coupled to ion chromatography hydride generation atomic fluorescence spectroscopy for the speciation of antimony.
Christopher Holstege of the Blue Ridge Poison Center at the University of Virginia Health System and colleagues at Virginia Commonwealth University have enlisted atomic absorption spectroscopy to show that people who drink moonshine, an illicit alcoholic drink common in Virginia and the southern states, are putting themselves at serious risk of lead poisoning.
www.spectroscopynow.com /coi/cda/home.cda?chId=1   (309 words)

  
 spectroscopyNOW.com - spectroscopy and spectrometry portal   (Site not responding. Last check: 2007-10-08)
Methyl benzoate is a marker for indoor mould
Raman microscopy and IR spectroscopy of prehistoric cave paintings
Register now to receive free monthly email newsletters bringing you the latest news and features in spectroscopy, and to access restricted areas of the site.
www.spectroscopynow.com /coi/cda/home.cda?chId=0   (147 words)

  
 ATOMIC SPECTROSCOPY
Atomic spectroscopy is carried out in the Lasers, Optics and Spectroscopy Group, which is formally a section of the Plasma Physics Research Institute at the University of Natal.
A number of interesting conclusions have been drawn regarding the polarisability of atoms in excited states, and the influence of polarisability on the atomic heating.
Simple models have been developed and are being improved, to explain these effects and to produce atomic data for further measurements.
www.nu.ac.za /physics/atomic/specweb.htm   (567 words)

  
 Amazon.com: An Introduction to Analytical Atomic Spectrometry: Books   (Site not responding. Last check: 2007-10-08)
Hill "Spectroscopy is generally considered to have started in 1666, with Newton's discovery of the solar spectrum..." (more)
An Introduction to Analytical Atomic Spectrometry is a thoroughly revised and updated version of the highly successful book by Les Ebdon, An Introduction to Atomic Absorption Spectroscopy.
Spectroscopy is generally considered to have started in 1666, with Newton's discovery of the solar spectrum.
www.amazon.com /exec/obidos/tg/detail/-/0471974188?v=glance   (493 words)

  
 Laser Focus World - Quantum-entangled ions tango to the tick of an optical clock
By the mid to late 1990s, advances in atomic spectroscopy had increased the resolution of atomic clocks based on the cesium microwave frequency transition to better than one part in 1015.
The high Q factor of the aluminum spectroscopy transition, however, is just one of four essential criteria necessary for precise atomic spectroscopy.
Multiple coherent excitations applied in several steps induced resonant oscillations in the spectroscopy ion, mapped the states of the spectroscopy ion onto the logic ion by way of quantum entanglement, and (through repetitive measurements) accurately determined the spectroscopy ion’s transition frequency.
lfw.pennnet.com /Articles/Article_Display.cfm?Section=ARTCL&ARTICLE_ID=236201&VERSION_NUM=2&p=12   (517 words)

  
 Atomic Absorption and Emission Spectra
The emission lines correspond to photons of discrete energies that are emitted when excited atomic states in the gas make transitions back to lower-lying levels.
Emission or absorption processes in hydrogen give rise to series, which are sequences of lines corresponding to atomic transitions, each ending or beginning with the same atomic state in hydrogen.
Because of the details of hydrogen's atomic structure, the Balmer Series is in the visible spectrum and the Lyman Series is in the the UV.
csep10.phys.utk.edu /astr162/lect/light/absorption.html   (408 words)

  
 Atomic Spectroscopy: An Introduction
Major recent compilations of atomic transition probabilities cover C, N and O [37] and the Fe-group elements [38].
A fairly comprehensive bibliographic review of compilations of data on atomic energy levels, wavelengths, transition probabilities, and spectral line shapes and shifts was published in 1992 [39].
Extensive data from compilations and other sources, as well as bibliographies, are included in the holdings of the NIST Atomic Spectra Database.
physics.nist.gov /Pubs/AtSpec/refs.html   (554 words)

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