R | Stimulated emission rate coefficient for transition from level 2 to 1 [24] |

R | Stimulated emission rate coefficient for transition from level 2 to 6 [32] |

K | Energy pooling collisions [11] |

K | Electron-atom collisional excitation or de-excitation between the states m and n [17] |

K | Electron collisional ionization rate coefficient from any energy level (n) [6] |

K | Radiative recombination rate coefficient to any energy level (n) [33] |

K | Three body recombination rate coefficient [33] |

A | Einstein coefficient for the spontaneous emission from the resonance level (2 → 1) and transition from any level n > m (n → m) [34] |

K | Associative ionization for the reactions (3p-3p) [15] , and (3p-3d) [16] |

K | Hornbeck-Molnar ionization [35] |

K | Penning ionization [29] |

${\sigma}_{nc}^{\left(1\right)}$ | Single-photon ionization cross section from any high energy level n [36] |

${\sigma}_{2c}^{\left(2\right)}$ | Two-photon ionization cross section from the saturated energy level (3P) [36] |

${\sigma}_{\text{PL}}$ | Laser-induced Penning ionization cross section [20] |

${K}_{4d+{\text{Na}}_{2}}$ | Triatomic associative ionization rate coefficient [1] |