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Download Appendix. Atoms and Molecule
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Transcript
Atoms and Molecules λc = 6 Chapter 10 hc 6,63 à 10 â34 à 3,00 Ã108 m = 62 pm = eV 1,60 Ã10 â19 à 20 Ã10 3 X-ray or Röntgenâs pictures These are Wilhelm Röntgenâs own pictures of his wifeâs hand from 1895. Wilhelm K. Röntgen 1845-1923 Moseley diagram When one examined the peaks of the X-ray spectrum for different anode materials one could see that the peaks corresponded to electronic transitions and photon emission from the materials inner shells. The big peak of the spectrum is called Kα and the one at shorter wavelength Kβ, which means an electron jumps to the K-shell, illustrated in the figure below. One systematically examined Kα and Kβ radiation for various elements with different atomic numbers, Z (proton number). Making a diagram where one puts the square root of the frequency of the radiation f1/2 against Z one gets a straight line, like in the figure below, which is called a Moseley diagram:
