## Chapter 1: Glossary |

## Name | |

Radiation from an object due to thermal energy | |

Model for the hydrogen atom as proposed by Niels Bohr | |

Radius of the electron orbit in a hydrogen atom corresponding to the lowest energy energy solution of the Bohr model | |

Wavelength of a particle | |

The energy which an electron can have | |

Heat divided by absolute temperature | |

The average energy per particle when adding particles to a distribution but without changing the entropy or the volume. Chemists refer to this quantity as being the electro-chemical potential | |

Particles with half-integer spin | |

One of Maxwell's equations, stating that the gradient of the electric field equals the charge density, divided by the dielectric constant. | |

Thermal energy | |

An atom consisting of a proton and an electron | |

Quantum mechanical concept, which states that particles can behave as waves and waves can behave as particles | |

Emission of electrons from a metal when applying light with photon energy larger than the workfunction of the metal | |

Quantum of electromagnetic radiation | |

Second order differential equation which relates the potential, f, to the charge density, r. | |

Theory which describes particles by a wavefunction | |

Unit of atomic energy = 13.6 eV | |

Atomic states which are associated with one principle quantum number | |

A single solution to Schrödinger's equation defined by a unique set of quantum numbers | |

Energy associated with the temperature of an object | |

A system is in thermal equilibrium if every ongoing process is exactly balanced by its inverse. | |

Wave description of a localized particle | |

Mechanical energy | |

Potential an electron at the Fermi energy needs to gain to escape from a solid |