# Atomic and Molecular Processes

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Atomic and Molecular Processes focuses on radiative and collisional processes involving atoms or molecules, including photoionization, elastic and inelastic scattering of electrons, energy loss by slow electrons, excitation, ionization, detachment, charge transfer, elastic scattering, and chemical reactions. The selection first offers information on forbidden and allowed transitions, including forbidden transitions in diatomic molecular spectra; forbidden transitions in crystals; calculations of atomic line strengths; and measurements of atomic transition probabilities. The book also ponders on photoionization processes, photodetachment, and high temperature shock waves. The manuscript elaborates on electronic and ionic recombination, elastic scattering of electrons, and the motions of slow electrons in gases. The book also evaluates the theory of excitation and ionization by electron impact; measurement of collisional excitation and ionization cross sections; and spectral line broadening in plasmas. The selection is a dependable reference for readers interested in atomic and molecular processes.

## Table of Contents

Contents

Contributors

Preface

1. Forbidden Transitions

1. Introduction

2. Forbidden Lines in Atomic Spectra

3. Forbidden Transitions In Diatomic Molecular Spectra

4. Forbidden Transitions in Polyatomic Molecular Spectra

5. Forbidden Transitions in Crystals

6. Forbidden Transitions in Astrophysics

References

2. Allowed Transitions

1. Introduction

2. Basic Concepts and Formulae

3. Calculations of Atomic Line Strengths

4. Theory of Molecular Line Strengths

5. Measurements of Atomic Transition Probabilities

6. Measurements of Molecular Transition Probabilities

References

3. Photoionization Processes

1. Introduction

2. Experimental

3. Theoretical

4. Results

References

4. Photodetachment

1. Introduction

2. Negative Ion Energy States

3. Theoretical Considerations

4. Experimental Method for Photodetachment Studies

5. The H~ Photodetachment Cross Section

6. Photodetachment Cross Sections for 0‾,S‾, and C‾

7. Photodetachment of Negative Molecular Ions

8. Formation of Negative Ions by Radiative Attachment

9. Atomic Electron Affinities

References

5. High-Temperature Shock Waves

1. Introduction

2. Hydrodynamic Considerations

3. Plane Shock Waves

4. High-Energy Cylindrical Shock Waves

5. Establishment of Equilibrium Plasmas

6. Experimental Vérification of the Rankine-Hugoniot Relations in Conventional Shock Tubes

7. Shock-Heated Plasmas as Thermal Light Sources

References

6. Attachment and Ionization Coefficients

1. Electron Attachment

2. Ionization Coefficients

3. Attachment Coefficients

References

7. Electronic Recombination

1. Collisional-Radiative Recombination

2. Recombination Involving a Free-Bound Radiationless Transition

3. Experimental Studies

References

8. Ionic Recombination

1. Three Body

2. Two Body

References

9. Elastic Scattering of Electrons

1. Scattering by a Potential Field

2. Measurement of Collision Cross Sections

3. Scattering by Hydrogen Atoms

4. Scattering by Complex Atoms and Ions

5. Scattering by Molecules

References

10. The Motions of Slow Electrons in Gases

1. Introduction

2. Theory of Motion of Ions and Electrons in Gases

3. Diffusion and Drift

4. Equation of Continuity

5. Mean Loss of Energy in Elastic Encounters

6. The Distribution Function f(c)

7. The Ratio W/D

8. Measurement of Mean Energy Lost in an Encounter

9. Experimental Procedure

10. Experimental Results

11. The Losses of Energy by Electrons in Colliding with Gas Molecules

References

11. The Theory of Excitation and Ionization by Electron Impact

1. Classical Theory

2. General Quantum Theory

3. Partial Wave Theory

4. Calculated and Measured Cross Sections

5. Collisional Excitation Treated as a Radiative Process

Appendix

References

12. The Measurement of Collisional Excitation and Ionization Cross Sections

1. Introduction

2. Electron Impact Studies

3. Ion Impact Studies

4. Neutral Impact Studies

5. Electron-Ion Collisions

References

13. Spectral Line Broadening in Plasmas

1. Introduction

2. Basic Considerations

3. The Impact Approximation

4. Applications of the Impact Approximation to Broadening by Electrons

5. Corrections to the Impact Approximation

6. Broadening by Ions

7. Comparison with Experiment

References

14. Theoretical Treatment of Collisions between Atomic Systems

1. First Born Approximation

2. Higher Approximations

3. Slow Collisions

References

15. Range and Energy Loss

1. Energy Loss of Charged Particles

2. Range of Charged Particles

3. Ionization by Charged Particles

4. Energy Loss of Electrons

5. Range of Electrons

6. Ionization by Electrons

References

16. Diffusion and Mobilities

Introduction

1. Diffusion

2. Mobilities

References

17. High-Energy Elastic Scattering of Atoms, Molecules, and Ions

1. Introduction

2. Scope of Present Survey

3. Classical Scattering Approximation

4. Elementary Description of Scattering Measurements

5. Experimental Methods

6. Elementary Classical Theory of Scattering

7. Analysis of Experiments

8. Summary of Experimental Results

9. Comparison of Scattering Results with Other Data

10. Summary

References

18. Charge Transfer and Collisional Detachment

1. Introduction

2. Collision Chamber Techniques

3. Mass Analysis Problems

4. Symmetrical Resonance Charge Transfer

5. Charge Transfer Reactions between Unlike Systems

6. Crossovers

7. Negative Ions and Collisional Detachment

References

19. Electron Capture and Loss at High Energies

1. Introduction

2. General References aad Previous Collections of Data

3. Mathematical Description of Charge Changing Probabilities; Notation

4. Experimental Equipment and Methods

5. Results on Hydrogen Beams

6. Results on Helium Beams

7. Results on Lithium Beams

8. Results on Boron Atomic and Ionic Beams; The Average Ionic Charge

9. Results on Carbon Beams

10. Results on Nitrogen Beams

11. Results on Oxygen Beams

12. Results on Atomic and Ionic Beams of the Halogens

13. Results on Neon Beams

14. Results on Argon Beams

15. Results on Krypton and Xenon Beams

16. Charge Changing Collisions of Fission Fragments

References

20. Relaxation In Gases

1. The Nature of The Relaxation Process

2. Phenomena Associated with Relaxation

3. Rotational Relaxation

4. Vibrational Relaxation In Pure Gases

5. Vibrational Relaxation In Gas Mixtures

References

21. Chemical Processes

1. Categorization of Reaction Rates

2. Measurement of Reaction Rates in Gases

3. Theory of Reaction Rates in Gases

References

Author Index

Subject Index

Species of Atom or Molecule

General

## Product details

- No. of pages: 920
- Language: English
- Copyright: © Academic Press 1962
- Published: January 1, 1962
- Imprint: Academic Press
- eBook ISBN: 9781483276021

## About the Editor

### D.R. Bates

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