Astronomical Spectroscopy An Introduction to the Atomic and Molecular Physics of Astronomical Spectra

ISBN-10: 9814291978
ISBN-13: 9789814291972
Edition: 2nd 2011 (Revised)
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Description: Nearly all information about the Universe comes from the study of light as it reaches us. However, understanding the information contained in this light requires both telescopes capable of resolving it into its component colours and a detailed  More...

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Book details

Edition: 2nd
Copyright year: 2011
Publisher: World Scientific Publishing Co Pte Ltd
Publication date: 1/25/2011
Binding: Paperback
Pages: 236
Size: 5.75" wide x 8.75" long x 0.75" tall
Weight: 0.946
Language: English

Nearly all information about the Universe comes from the study of light as it reaches us. However, understanding the information contained in this light requires both telescopes capable of resolving it into its component colours and a detailed knowledge of the quantum mechanical behaviour of atoms and molecules. This book, which is based on a third-year undergraduate course taught by the author at University College London, presents the basic atomic and molecular physics necessary to understand and interpret astronomical spectra. It explains how and what kind of information can be extracted from these spectra. Contemporary astronomical spectra are used extensively to study the underlying atomic physics and illustrate the results.

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

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