1 | \(e+He \to e+He\) | Cross-section | Elastic |

2 | \(e+He \leftrightarrow e+H{e^*}\left( 1 \right)\) | Cross-section | Excitation |

3 | \(e+He \leftrightarrow e+H{e^*}\left( 2 \right)\) | Cross-section | Excitation |

4 | \(e+He \leftrightarrow e+H{e^*}\left( 3 \right)\) | Cross-section | Excitation |

5 | \(e+He \leftrightarrow e+H{e^*}\left( 4 \right)\) | Cross-section | Excitation |

6 | \(e+H{e^*}\left( 1 \right) \leftrightarrow e+H{e^*}\left( 2 \right)\) | Cross-section | Stepwise excitation |

7 | \(e+H{e^*}\left( 1 \right) \leftrightarrow e+H{e^*}\left( 3 \right)\) | Cross-section | Stepwise excitation |

8 | \(e+H{e^*}\left( 1 \right) \leftrightarrow e+H{e^*}\left( 4 \right)\) | Cross-section | Stepwise excitation |

9 | \(e+H{e^*}\left( 2 \right) \leftrightarrow e+H{e^*}\left( 3 \right)\) | Cross-section | Stepwise excitation |

10 | \(e+H{e^*}\left( 2 \right) \leftrightarrow e+H{e^*}\left( 4 \right)\) | Cross-section | Stepwise excitation |

11 | \(e+H{e^*}\left( 3 \right) \leftrightarrow e+H{e^*}\left( 4 \right)\) | Cross-section | Stepwise excitation |

12 | \(e+He \to 2e+H{e^+}\) | Cross-section | Direct ionization |

13 | \(e+H{e^*}\left( 1 \right) \to 2e+H{e^+}\) | Cross-section | Stepwise ionization |

14 | \(e+H{e^*}\left( 2 \right) \to 2e+H{e^+}\) | Cross-section | Stepwise ionization |

15 | \(e+H{e^*}\left( 3 \right) \to 2e+H{e^+}\) | Cross-section | Stepwise ionization |

16 | \(e+H{e^*}\left( 4 \right) \to 2e+H{e^+}\) | Cross-section | Stepwise ionization |

17 | \(e+He_{2}^{*}\left( 1 \right) \to 2e+He_{2}^{+}\) | Cross-section | Stepwise ionization |

18 | \(e+He_{2}^{*}\left( 2 \right) \to 2e+He_{2}^{+}\) | Cross-section | Stepwise ionization |

19 | \(e+He_{2}^{*}\left( 1 \right) \to 2e+He_{2}^{*}\left( 2 \right)\) | Cross-section | Stepwise excitation |

20 | \(e+He_{2}^{*}\left( 1 \right) \to e+2He\) | \(3.8 \times {10^{ - 15}}\,\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Metastable dissociation |

21 | \(e+He_{2}^{+} \to He+H{e^*}\left( 3 \right)\) | \(3.43 \times {10^{ - 17}}{{\text{T}}_e}^{{ - 0.5}}{{\text{m}}^3}{{\text{s}}^{ - 1}}\) | Diss. recomb. |

22 | \(e+He_{2}^{+} \to He+H{e^*}\left( 2 \right)\) | \(1.84 \times {10^{ - 17}}{{\text{T}}_e}^{{ - 0.5}}{{\text{m}}^3}{{\text{s}}^{ - 1}}\) | Diss. recomb. |

23 | \(2e+He_{2}^{+} \to He_{2}^{*}\left( 2 \right)+e\) | \(3.59 \times {10^{ - 39}}{T_e}^{{{\text{-4}}{\text{.5}}}}{{\text{m}}^6}{{\text{s}}^{ - 1}}\) | Recombination |

24 | \(e+He+He_{2}^{+} \to He_{2}^{*}\left( 2 \right)+He\) | \(4.15 \times {10^{ - 41}}{T_e}^{{{\text{-1}}{\text{.5}}}}{{\text{m}}^6}{{\text{s}}^{ - 1}}\) | Recombination |

25 | \(H{e^*}\left( 2 \right)+He \to H{e^*}\left( 1 \right)+He\) | \(3.6 \times {10^{ - 21}}{{\text{m}}^6}{{\text{s}}^{ - 1}}\) | De-excitation |

26 | \(H{e^+}+2He \to He_{2}^{+}+He\) | \(3.017 \times {10^{ - 41\,}}{T_g}^{{ - 1}}{{\text{m}}^6}{{\text{s}}^{ - 1}}\) | Ion conversion |

27 | \(H{e^*}\left( 1 \right)+2He \to He_{2}^{*}\left( 1 \right)+He\) | \(3.23 \times {10^{ - 45}}\,\exp \left( { - \frac{{778}}{{{T_g}}}} \right)\,{{\text{m}}^{\text{6}}}{{\text{s}}^{{\text{-1}}}}\) | Conversion into excimers |

28 | \(H{e^*}\left( 2 \right)+2He \to He_{2}^{*}\left( 2 \right)+He\) | \(3.23 \times {10^{ - 45}}\,\exp \left( { - \frac{{778}}{{{T_g}}}} \right)\,\,{{\text{m}}^{\text{6}}}{{\text{s}}^{{\text{-1}}}}\) | Conversion into excimers |

29 | \(H{e^*}\left( 3 \right)+2He \to He_{2}^{*}\left( 2 \right)+He\) | \(3.23 \times {10^{ - 45}}\,\exp \left( { - \frac{{778}}{{{T_g}}}} \right)\,\,{{\text{m}}^{\text{6}}}{{\text{s}}^{{\text{-1}}}}\) | Conversion into excimers |

30 | \(H{e^*}\left( 4 \right)+2He \to He_{2}^{*}\left( 2 \right)+He\) | \(3.23 \times {10^{ - 45}}\,\exp \left( { - \frac{{778}}{{{T_g}}}} \right)\,\,{{\text{m}}^{\text{6}}}{{\text{s}}^{{\text{-1}}}}\) | Conversion into excimers |

31 | \(H{e^*}\left( 1 \right)+H{e^*}\left( 1 \right) \to H{e^+}+He+e\) | \(2.4 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

32 | \(H{e^*}\left( 1 \right)+H{e^*}\left( 2 \right) \to H{e^+}+He+e\) | \(2.4 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

33 | \(H{e^*}\left( 1 \right)+H{e^*}\left( 3 \right) \to H{e^+}+He+e\) | \(2.4 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

34 | \(H{e^*}\left( 1 \right)+H{e^*}\left( 4 \right) \to H{e^+}+He+e\) | \(2.4 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

35 | \(H{e^*}\left( 1 \right)+He_{2}^{*}\left( 1 \right) \to H{e^+}+2He+e\) | \(2.5 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

36 | \(H{e^*}\left( 1 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+2He+e\) | \(2.5 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

37 | \(2H{e^*}\left( 2 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

38 | \(H{e^*}\left( 2 \right)+H{e^*}\left( 3 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

39 | \(H{e^*}\left( 2 \right)+H{e^*}\left( 4 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

40 | \(H{e^*}\left( 2 \right)+He_{2}^{*}\left( 1 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

41 | \(H{e^*}\left( 2 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

42 | \(H{e^*}\left( 3 \right)+H{e^*}\left( 3 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

43 | \(H{e^*}\left( 3 \right)+H{e^*}\left( 4 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

44 | \(H{e^*}\left( 3 \right)+He_{2}^{*}\left( 1 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

45 | \(H{e^*}\left( 3 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

46 | \(H{e^*}\left( 4 \right)+H{e^*}\left( 4 \right) \to H{e^+}+He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

47 | \(H{e^*}\left( 4 \right)+He_{2}^{*}\left( 1 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

48 | \(H{e^*}\left( 4 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+2He+e\) | \(2.1 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

49 | \(He_{2}^{*}\left( 1 \right)+He_{2}^{*}\left( 1 \right) \to H{e^+}+3He+e\) | \(2.4 \times {10^{ - 16}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

50 | \(He_{2}^{*}\left( 1 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+3He+e\) | \(2.4 \times {10^{ - 16}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

51 | \(He_{2}^{*}\left( 2 \right)+He_{2}^{*}\left( 2 \right) \to H{e^+}+3He+e\) | \(2.4 \times {10^{ - 16}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

52 | \(He_{2}^{*}\left( 2 \right)+He_{2}^{*}\left( 2 \right) \to He_{2}^{+}+2He+e\) | \(1.26 \times {10^{ - 15}}\,\,{{\text{m}}^{\text{3}}}{{\text{s}}^{{\text{-1}}}}\) | Penning ionization |

53 | \(H{e^*}\left( 4 \right) \to He+hv\) | \(1.8 \times {10^9}\,\,{{\text{s}}^{{\text{-1}}}}\) | Radiative transition |

54 | \(H{e^*}\left( 3 \right) \to H{e^*}\left( 1 \right)+hv\) | \(1.02 \times {10^7}\,\,{{\text{s}}^{{\text{-1}}}}\) | Radiative transition |

55 | \(H{e^*}\left( 4 \right) \to H{e^*}\left( 2 \right)+hv\) | \(1.97 \times {10^6}\,\,{{\text{s}}^{{\text{-1}}}}\) | Radiative transition |

56 | \(He_{2}^{*}\left( 2 \right) \to 2He+hv\) | \(1 \times {10^9}\,\,{{\text{s}}^{{\text{-1}}}}\) | Radiative transition |