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Home > Art, Film & Photography > Mass Analyzer: Time-Of-Flight Mass Spectrometry
Mass Analyzer: Time-Of-Flight Mass Spectrometry

Mass Analyzer: Time-Of-Flight Mass Spectrometry


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Time-of-flight mass spectrometry (TOFMS) is a method of mass spectrometry in which ions are accelerated by an electric field of known strength. This acceleration results in an ion having the same kinetic energy as any other ion that has the same charge. The velocity of the ion depends on the mass-to-charge ratio. The time that it subsequently takes for the particle to reach a detector at a known distance is measured. This time will depend on the mass-to-charge ratio of the particle (heavier particles reach lower speeds). From this time and the known experimental parameters one can find the mass-to-charge ratio of the ion. Figure from William E. Stephens 1952 TOF patent.The potential energy of a charged particle in an electric field is related to the charge of the particle and to the strength of the electric field: where Ep is potential energy, q is the charge of the particle, and U is the electric potential difference (also known as voltage). When the charged particle is accelerated into time-of-flight tube by the voltage U, its potential energy is converted to kinetic energy. The kinetic energy of any mass is: In effect, the potential energy is converted to kinetic energy, meaning that equations and are equal The velocity of the charged particle after acceleration will not change since it moves in a field-free time-of-flight tube. The velocity of the particle can be determined in a time-of-flight tube since the length of the path (d) of the flight of the ion is known and the time of the flight of the ion (t) can be measured using a transient digitizer or time to digital converter. Thus, and we substitute the value of v in Eqn into Eqn . Rearranging Eqn so that the flight time is expressed by everything else: Taking the square root of the t... More: http://booksllc.net/?id=13505242


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Product Details
  • ISBN-13: 9781156322581
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Time-Of-Flight Mass Spectrometry
  • Width: 229 mm
  • ISBN-10: 1156322588
  • Publisher Date: 31 May 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 73 gr


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