Electromagnetic radiation high energy electron interaction

X rays are a short wavelength form of electromagnetic radiation discovered by Wilhelm Roentgen in the late 19th century [2]. When a high-energy electron beam is incident upon a specimen, one of the products of the interaction is the emission of a broad-wavelength band called the continuum, also referred to as white radiation or... 

Mass spectrometry is used to measure the molecular mass of a compound and provides a method to obtain the molecular formula. It differs from the other instrumental techniques presented thus far because it does not involve the interaction of electromagnetic radiation with the compound. Instead, molecules of the compound being studied are bombarded with a high-energy beam of electrons in the vapor phase. When an electron from the beam impacts on a molecule of the sample, it knocks an electron out of the molecule. The product, called the molecular ion (represented as A/f), has the same mass as the original molecule but has one less electron. It has both an odd number of... 

As with UV-vis spectroscopy, IR and NMR spectroscopy are based on the interaction of electromagnetic radiation with molecules, whereas MS is different in that it relies on high-energy particles (electrons or ions) to break up the molecules. The relationship between the various types of spectroscopy and the electromagnetic spectrum is shown in Table 28.1. 

Compton effect. One of the principal processes by which high-energy electromagnetic radiation (y-rays) interacts with or is absorbed by matter. In the Compton process the y-ray frees an electron in matter as if the electron were unbound, dividing the momentum of the y-ray between the ejected electron and a new y-ray of lower energy going off in a new direction. 

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