1 / 41

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

tallys
Download Presentation

Atomic K -shell decay

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related