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Spectroscopy of Low Temperature Plasma

ISBN: 978-3-527-40778-1
630 pages
March 2009
Spectroscopy of Low Temperature Plasma (3527407782) cover image
Written by a distinguished plasma scientist and experienced author, this up-to-date work comprehensively covers current methods and new developments and techniques, including non-equilibrium atomic and molecular plasma states, as well as such new applications as gas lasers.
Containing numerous appendices with reference data indispensable for plasma spectroscopy, such as statistical weights and partition sums and diatomic molecules.
For plasmaphysicists, spectroscopists, materials scientists and physical chemists.
Appendix H is only available online.
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Preface XIII

References XVI

1 Plasma as an Object of Spectroscopy 1

General Notions 1

1.1 The Concept of Low-Temperature Plasma. Diagnostics Problems 1

1.2 Equilibrium Plasma 6

1.2.1 Energy Distribution of Particles 6

1.2.2 Law of Mass Action. Neutral and Charged Particle Densities 7

1.2.3 Heat Emission. Kirchhoff’s Law 11

1.3 Models of Equilibrium and the Associated Parameters 14

1.3.1 Local Thermal Equilibrium (LTE) Model 14

1.3.2 Partial Local Thermal Equilibrium (PLTE) Model 16

1.3.3 Model of Coronal Equilibrium (MCE) 20

1.3.4 Collisional-Radiative Model (CRM) 21

1.4 Optical Spectrum and Plasma Parameters 22

References 25

2 Basic Concepts and Parameters Associated with the Emission, Absorption and Scattering of Light by Plasma 27

2.1 Photometric Quantities. Remarks on Terminology 27

2.2 Spectral Line Profile 31

2.2.1 Lorentz Broadening 32

2.2.2 Doppler Broadening 38

2.2.3 Joint Action of Natural, Doppler and Collision Broadening 41

2.3 Absorption in Lines 44

2.4 Emission in Lines. Optical Density Manifestations 46

2.5 Emission and Absorption in Continuous Spectrum 50

2.5.1 ff Bremsstrahlung Emission 52

2.5.2 ff Bremsstrahlung Absorption 54

2.5.3 fb Recombination Emission 55

2.5.4 Absorption Cross Section in bf Photoionization 57

2.5.5 Emission and Absorption of Radiation in the Case of Joint Action of the ff Bremsstrahlung and fb Recombination Mechanisms 58

2.6 Scattering of Light 60

2.6.1 Thomson Scattering on a Free Electron 60

2.6.2 Scattering on a Bound Electron 63

References 63

3 Emission, Absorption and Scattering Techniques for Determining the Densities of Particles in Discrete Energy States 67

3.1 Emission Techniques 67

3.1.1 Identification of Spectra 67

3.1.2 Absolute Measurements 68

3.1.3 Emission of Extended Inhomogeneous Sources 71

3.2 Absorption Techniques Using Classical Emitters 75

3.2.1 Absorption Against the Background of Continuous Spectrum 75

3.2.2 Line Absorption 78

3.2.3 Self-Absorption of Multiplet Lines 83

3.3 Absorption Spectroscopy Using Tunable and Broadband Lasers 84

3.3.1 On the Advantages of Laser Sources Over Their Classical Counterparts in Direct Absorption Measurements 84

3.3.2 On the Noise Limitation of Sensitivity 86

3.3.3 Diode Laser Spectroscopy in the IR Region 88

3.3.4 Nonstationary Coherent Effects in Absorption Measurements 92

3.3.5 Use of the Classical Multipass Absorption Cells 95

3.3.6 Intracavity Absorption 95

3.3.7 Measuring Absorption from the Attenuation of Light with Time 99

3.4 Indirect Methods for Measuring Absorption of Laser Light 103

3.4.1 Induced Fluorescence 104 General Characteristic 104 Fluorescence Excitation by Continuous-Wave and Pulsed Laser Light 107 Induced Fluorescence Saturation and Decay 109 Induced Fluorescence Quenching and Taking Account of this Process 112 Restrictions Imposed by the Plasma’s Own Glow 118

3.4.2 Optogalvanic Spectroscopy 121 The Use of the Optogalvanic Effect to Measure Light Absorption in Plasma 121 High-Resolution Optogalvanic Spectroscopy 124

3.5 Multiphoton Processes. Raman Scattering 129

3.5.1 Two-Photon Absorption 130

3.5.2 Spontaneous Raman Scattering 133

3.5.3 Stimulated Raman Scattering 135

3.5.4 Coherent Anti-Stokes Scattering 137

References 143

4 Intensities in Spectra and Plasma Energy Distribution in the Internal and Translational Degrees of Freedom of Atoms and Molecules 147

4.1 Doppler Broadening, Velocity Distribution of Particles, Neutral Gas Temperature 147

4.1.1 Remarks on the Processing of Line Profiles 148 Registered and True Profiles 148 Predominantly Doppler Broadening Regions 149 Recovery of the Form of the Velocity Distribution of Particles 150

4.1.2 Examples of Abnormal Doppler Broadening and Nonequilibrium Velocity Distributions of Neutral Particles in Plasma 151

4.1.3 Excitation and Relaxation of Atoms and Molecules with Nonequilibrium Velocity in Interactions with Heavy Particles 154 Source Function 154 Relaxation of the Average Kinetic Energy of Particles with a Finite Lifetime 155 Relaxation of the Form of the Velocity Distributions of Particles in the Case of Large Deviations from Equilibrium and Finite Lifetime 159

4.1.4 On the Determination of the Gas Temperature from the Doppler Broadening of the Lines Emitted by Atoms and Molecules Excited by Electrons 161

4.1.5 Spectroscopic Manifestations of the Motion of Ions in Plasma 164

4.2 Distribution of Molecules Among Rotational Levels 167

4.2.1 On the Isolation of the Boltzmann Ensembles in the Bound State System of Particles 167

4.2.2 Distributions of Molecules Among Rotational Levels in an Electronic State with a Long Lifetime 170

4.2.3 Electron Impact Excitation of the Electronic–Vibrational–Rotational (EVR) Levels of Molecules 174 Observations and General Considerations 174 Experimental Determination of the Electron-Impact-Induced Changes in the Rotational States of Molecules in Plasma 177

4.2.4 Excitation of EVR Levels by Heavy Particles 181 OH Radical. Violet Bands 181 N2 Molecules. Second Positive System 183

4.2.5 On Gas Temperature Measurements in the Presence of Parallel Molecular Rotation Excitation Channels 184 Extension of the Form of Distribution of the Hot Molecules to the Region of Low Rotational Levels 185 Spectral Resolution 185 Effect of the Conditions Occuring in Plasma on the Rotational Temperature of the Hot Group 188

4.3 Line Intensities in the Vibrational Structure of Spectra and Distributions of Molecules Among Vibrational Levels 191

4.3.1 Elements of Vibrational Kinetics. Vibrational Energy and Temperature 191 Harmonic Oscillator Approximation 192 Effect of Anharmonicity 194 Diatomic Molecular Mixture and Polyatomic Molecules 197

4.3.2 Vibrational Temperature and Distribution Measurements by Absorption Spectroscopy Techniques 199

4.3.3 Emission Methods in the IR Region of the Spectrum 206

4.3.4 Combinations of Emission and Absorption Techniques. Spectrum Inversion 211

4.3.5 Raman Scattering 216

4.3.6 Determination of the Vibrational Temperatures of Molecules in the Electronic Ground States from Electronic Transition Spectra 220

4.4 Distribution of Particles Among Electronic Levels 224

References 227

5 Measuring Concentrations of Atoms and Molecules 235

5.1 General 235

5.2 Determining Atomic Concentrations by Absorption Techniques 237

5.2.1 Neutral Unexcited Atoms 237

5.2.2 Metastable Atoms 249

5.2.3 Low-Multiplicity Positive Ions 266

5.3 Determination of Molecular Concentration by the Absorption Method 268

5.3.1 Probabilities of Optical Transitions in Diatomic Molecules 269

5.3.2 Determination of Diatomic Molecular Concentrations from Absorption on Electronic Spectrum Lines 272

5.3.3 Determination of Molecular Concentration from Absorption in Vibrational–Rotational Spectra 278

5.3.4 Absorption of Radiation by Diatomic Molecules in Metastable Electronic States 281

5.3.5 Absorption of IR Radiation by Polyatomic Molecules 281

5.3.6 Absorption of Radiation by Molecular Ions 284

5.4 Actinometric Methods 288

5.5 Negative Ions 297

5.5.1 Concentration Measurements 298

5.5.2 Absorption of Light by the H− Ions in Hydrogen LTE Plasma 301

References 303

6 Spectral Methods of Determining Electronic and Magnetic Fields in Plasma 307

6.1 Determination of Electric Fields from the Spontaneous Emission of Radiation by Atoms in Plasma 312

6.1.1 Hydrogen-Like Atoms 312

6.1.2 Non-Hydrogen-Like Atoms 318

6.2 Laser Stark Spectroscopy 322

6.2.1 Stark Spectroscopy of Atoms 323

6.2.2 Laser-Induced Fluorescence of Polar Molecules in Electric Field 329

6.2.3 Multiphoton Excitation of Atoms 334

6.2.4 Coherent Four-Wave Stark Scattering Spectroscopy 337

6.3 Magnetic Field Investigations 342

6.3.1 Measurements Based on the Faraday Effect 342

6.3.2 Spectral Methods 343

References 346

7 Determination of the Parameters of the Electronic Component of Plasma 351

7.1 Interferometry 351

7.2 Stark Broadening of Spectral Lines 356

7.2.1 General 356

7.2.2 Plasma Microfields 357

7.2.3 Linear Stark Effect 358

7.2.4 Quadratic Stark Effect 364

7.3 Truncation of Spectral Series of Hydrogen-Like Atoms 367

7.4 Intensities in Continuous Spectrum 371

7.5 Scattering of Light on Electrons 374

7.5.1 Scattering of Light by Randomly Moving Electrons (Thomson Scattering) 375

7.5.2 Manifestation Regions of the Thomson and Collective Scattering Mechanisms 377

7.5.3 Scattered Spectrum and Plasma Parameters (Direct Problem) 379

7.5.4 Determination of Plasma Parameters from Scattered Spectra (Inverse Problem) 381

7.5.5 Limitations of the Method, Sensitivity and Examples 385

7.6 Some Remarks on Measurements from Intensities in Line and Band Spectra 391

References 393

8 Some Information on Spectroscopy Techniques 397

8.1 Characteristics of Optical Materials. Main Relations 398

8.1.1 Reflection at an Interface 398

8.1.2 Dispersion of the Optical Properties of Materials 399

8.1.3 Transmission and Reflection of Thin Films 400 Metal Films 400 Dielectric Films 402

8.2 Spectral Instruments 406

8.2.1 Slit Instruments 409

8.2.2 Interferometers 414

8.2.3 Spectral Instruments with Interference Modulation 425 Fourier(-Transform) Spectrometers 425 Interference Spectrometers with Selective Amplitude Modulation (ISSAM) 430

8.2.4 Raster Spectrometers 431

8.2.5 Acousto-optic Spectrometers 433

8.3 Gas-Discharge Light Sources 439

8.3.1 Illumination Engineering Quantities 439

8.3.2 Gas Discharges in an Envelope (Lamps) 441 Continuous-Discharge Lamps 441 Pulsed-Discharge Lamps 448

8.3.3 Open Light Sources 456 Continuous-Discharge Sources 456 Pulsed-Discharge Sources 456

8.4 Photodetectors 460

8.4.1 Parameters 461 Sensitivity 461 Noise 462 Effective and Ultimate Sensitivity 463 Inertia 464

8.4.2 Main Types of Single-Element Detectors 464 Thermal Detectors 464 Photoelectric (Quantum, Photonic) Detectors with Extrinsic Photoeffect 466 Photoelectric Detectors with Intrinsic Photoeffect 470 Photoemulsion 471 Comparative Characteristics of Single-Element Detectors 473

8.4.3 Multielement and Distributed Photodetectors 477 Spatial Resolution 477 Photographic Detectors 478 Image Converter and Intensifier Tubes 479 Charge-Coupled Detectors 480

References 484

Appendix A Statistical Weights and Statistical Sums 487

Appendix B Conversion of Quantities Used to Describe Optical Transition Probabilities in Line Spectra 497

Appendix C Two-Photon Absorption Cross Sections for Some Atoms and Molecules in the Ground State 499

Appendix D Information on Some Diatomic Molecules for the Identification and Processing of Low-Temperature Plasma Spectra 505

Appendix E

Rotational Line Intensity Factors in the Electronic–Vibrational Transition Spectra of Diatomic Molecules 569

Appendix F Measurement of the Absolute Populations of Excited Atoms by Classical Spectroscopy Techniques 583
Yu. B. Golubovskii

References 595

Appendix G General Information for Plasma Spectroscopy Problems 597

References 600

Index 603

Appendix H Optical Constants of Materials∗ 611

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V. N. Ochkin, after receiving his PhD degree from the P.N.Lebedev Physical Institute, now serves as deputy director of this institution as well as head of the Laser Technology Section of the Russian Academy of Engineering Sciences. The main fields of his scientific interests are physical and chemical kinetics of gas discharge active medias, frequency tunable gas lasers, dispersive resonators and Waveguide lasers as well as various kinds of plasma. Professor Ochkin has authored more than 300 publications and several books.
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