Physics & Astronomy

1. fluorescence 100%
2. ions 80%
3. x rays 79%
4. decay rates 77%
5. transition probabilities 75%
6. energy 70%
7. binding energy 60%
8. photons 53%
9. ionization cross sections 50%
10. electrons 49%
11. atoms 48%
12. x ray spectra 44%
13. quantum electrodynamics 41%
14. ionization 41%
15. configurations 41%
16. cross sections 36%
17. diagrams 35%
18. x ray spectrometers 31%
19. molecular properties 30%
20. encounters 29%
21. excitation 27%
22. atomic weights 27%
23. electron impact 26%
24. splines 25%
25. ion sources 25%
26. fine structure 24%
27. emission spectra 24%
28. electronics 22%
29. energy levels 22%
30. photoionization 21%
31. wave functions 20%
32. approximation 20%
33. Klein-Gordon equation 20%
34. asymmetry 19%
35. argon 19%
36. vacuum 18%
37. ground state 18%
38. kaons 17%
39. synchrotron radiation 17%
40. dipoles 17%
41. beryllium 17%
42. evaluation 16%
43. orbitals 16%
44. neon 16%
45. quantum electronics 16%
46. x ray fluorescence 16%
47. isoelectronic sequence 16%
48. polarization 15%
49. chemical effects 15%
50. astrophysics 15%