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| Preface | |
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| Why Record Spectra of Astronomical Objects? | |
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| A Historical Introduction | |
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| What One Can Learn from Studying Spectra | |
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| The Nature of Spectra | |
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| Transitions | |
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| Absorption and Emission | |
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| Other Measures of Transition Probabilities | |
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| Stimulated Emission | |
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| Optical Depth | |
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| Critical Density | |
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| Wavelength or Frequency? | |
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| The Electromagnetic Spectrum | |
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| Atomic Hydrogen | |
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| Overview | |
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| The Schr�dinger Equation of Hydrogen-Like Atoms | |
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| Reduced Mass | |
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| Atomic Units | |
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| Wavefunctions for Hydrogen | |
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| Energy Levels and Quantum Numbers | |
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| H-Atom Discrete Spectra | |
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| H-Atom Spectra in Different Locations | |
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| Balmer series | |
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| Lyman series | |
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| Infrared lines | |
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| H-Atom Continuum Spectra | |
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| Processes | |
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| H-atom emission in H II regions | |
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| Radio Recombination Lines | |
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| Radio Recombination Lines for Other Atoms | |
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| Angular Momentum Coupling in the Hydrogen Atom | |
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| The Fine Structure of Hydrogen | |
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| Hyperfine Structure in the H Atom | |
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| Allowed Transitions | |
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| Hydrogen in Nebulae | |
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| Complex Atoms | |
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| General Considerations | |
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| Central Field Model | |
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| Indistinguishable Particles | |
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| Electron Configurations | |
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| The Periodic Table | |
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| Ions | |
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| Angular Momentum in Complex Atoms | |
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| L-S or Russell-Saunders coupling | |
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| j-j coupling | |
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| Why two coupling schemes? | |
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| Spectroscopic Notation | |
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| Parity of the Wavefunction | |
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| Terms and Levels in Complex Atoms | |
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| Helium Spectra | |
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| He I and He II Spectra | |
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| Selection Rules for Complex Atoms | |
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| Observing Forbidden Lines | |
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| Grotrian Diagrams | |
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| Potential Felt by Electrons in Complex Atoms | |
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| Emissions of Helium-Like Ions | |
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| Alkali Atoms | |
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| Sodium | |
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| Spin-Orbit Interactions | |
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| Fine Structure Transitions | |
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| Astronomical Sodium Spectra | |
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| Other Alkali Metal-Like Spectra | |
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| Spectra of Nebulae | |
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| Nebulium | |
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| The Bowen Mechanism | |
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| Two Valence Electrons | |
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| Autoionisation and Recombination | |
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| Spectra in Magnetic Fields | |
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| Uniform Magnetic Field | |
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| Strong Magnetic Field | |
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| Weak Magnetic Field | |
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| The normal Zeeman effect | |
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| The anomolous Zeeman effect | |
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| Spectra in Magnetic Field | |
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| X-Ray Spectra | |
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| Inner Shell Processes | |
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| The Solar Corona | |
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| The Structure of Highly Ionised Atoms | |
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| Isotope Effects | |
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| Molecular Structure | |
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| The Born-Oppenheimer Approximation | |
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| Electronic Structure of Diatomics | |
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| Labelling of electronic states | |
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| Symmetry | |
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| State labels | |
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| Schr�dinger Equation | |
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| Nuclear motion in diatomic molecules | |
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| Fractionation | |
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| Vibration-Rotation Energy Levels | |
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| Temperature Effects | |
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| Rotational state populations | |
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| Vibrational state populations | |
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| Electronic state populations | |
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| Rotational Spectra | |
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| Rotational Structure of Polyatomic Molecules | |
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| Selection Rules: Pure Rotational Transitions | |
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| Selection Rules | |
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| Isotope Effects | |
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| Rotational Spectra of Other Molecules | |
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| Rotational Spectra of Molecular Hydrogen | |
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| Maser Emissions | |
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| Vibration-Rotation Spectra | |
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| Vibrations in Polyatomic Molecules | |
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| Vibrational Transitions | |
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| Structure of the spectrum | |
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| Isotope effects | |
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| Hydrogen molecule vibrational spectra | |
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| Astronomical Spectra | |
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| Electronic Spectra of Diatomic Molecules | |
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| Electronic Transitions | |
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| Selection Rules | |
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| Vibrational selection rules | |
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| Rotational selection rules | |
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| Transition Frequencies | |
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| Astronomical Spectra | |
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| Non-<sup>1</sup> � Electronic States | |
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| Solutions to Model Problems | |
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| Further Reading and Bibliography | |
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| Index | |