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Atomic K -shell decay

Atomic K -shell decay. Atomic shells. 1s 1/2 K 2s 1/2 L 1 2p 1/2 L 2 2p 3/2 L 3 3s 1/2 M 1 3p 1/2 M 2 3p 3/2 M 3 3d 3/2 M 4 3d 5/2 M 5 4 … N…. L 2,3. M 2,3. M 4,5. Atomic shells. Degeneracy ( 2 j +1 ). 1s 1/2 K 2s 1/2 L 1 2p 1/2 L 2 2p 3/2 L 3 3s 1/2 M 1

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Atomic K -shell decay

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  1. Atomic K-shell decay

  2. Atomic shells 1s1/2 K 2s1/2 L1 2p1/2 L2 2p3/2 L3 3s1/2 M1 3p1/2 M2 3p3/2 M3 3d3/2 M4 3d5/2 M5 4 … N… L2,3 M2,3 M4,5

  3. Atomic shells Degeneracy (2j+1) 1s1/2 K 2s1/2 L1 2p1/2 L2 2p3/2 L3 3s1/2 M1 3p1/2 M2 3p3/2 M3 3d3/2 M4 3d5/2 M5 4 … N… 2 2 2 2 4 2 2 4 4 6 L2,3 8 6 M2,3 8 20 M4,5 10

  4. Energy levels …. M4,5 M2,3 M1 L2,3 L1 K

  5. Energy levels …. M4,5 M2,3 M1 L2,3 Binding energy L1 K

  6. K-shell binding energies Z Atom K b.e. (eV) 1 H 13.6058 2 He 24.6 10 Ne 870.2 18 Ar 3,205.9 36 Kr 14,326. 54 Xe 34,561.

  7. Aufbau …. H M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  8. Aufbau …. He M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  9. Aufbau …. Li M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  10. Aufbau …. Be M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  11. Aufbau …. B M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  12. Aufbau …. C M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  13. Aufbau …. N M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  14. Aufbau …. O M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  15. Aufbau …. F M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  16. Aufbau …. Ne M4,5 M2,3 M1 L2,3 L1 Single-particle levels ! K

  17. Use Ne as our example: ‘ground state’ L2,3 L1 Total energy = K

  18. Use Ne as our example: Singly-ionized state L2,3 L1 Total energy = K

  19. Level scheme

  20. Use Ne as our example: Singly-ionized states L2,3 L1 Total energy = K

  21. Level scheme

  22. Use Ne as our example: Singly-ionized state L2,3 L1 Total energy = K

  23. Level scheme

  24. + Single photon continua

  25. Radiative decay rates:

  26. Ne K-L23 Radiative decay →2p hole 1s 2p Ka x-ray Excitation(1s photo-ionization) Photo-electron

  27. Doubly-ionized states L2,3 L1 Total energy = K

  28. Doubly-ionized states L2,3 L1 Total energy = K

  29. Doubly-ionized states L2,3 L1 Total energy = K

  30. + Single electron continua

  31. Non-Radiative (Auger) decay rates:

  32. Ne K-L1L23 Auger decay →2s & 2p holes 1s 2s 2p Auger electron Excitation(1s Photoionization) photo-electron

  33. Florescence yield = 1.9 % Auger yield = 98.1 %

  34. counts FWHM = 290 meV X-ray energy 843 eV

  35. FWHM = 290 meV counts 1 31/56 11/56 electron energy 749 eV 779 eV 803 eV

  36. K-shell yields

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