Fourier Transform Infrared Spectrometry
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1 Fourier Transform Infrared Spectrometry \ ' PETER R. GRIFFITHS Department of Chemistry University of California Riverside, California JAMES A. de HASETH Department of Chemistry University of Georgia Athens, Georgia A WILEY-INTERSCIENCE PUBLICATION JOHN WILEY & SONS New York / Chichester / Brisbane / Toronto / Singapore
2 CONTENTS CHAPTER 1. THE MICHELSON INTERFEROMETER I. II. III. IV. V. VI. VII. vm. IX. X. Introduction 1 Monochromatic Light Sources 2 Polychromatic Sources 6 Finite Resolution 9 Apodization 15 Phase Errors 25 Effect of Beam Divergence through the Interferometer 33 Effect of Mirror Misalignment 39 Effect of a Poor Mirror Drive 41 Slow-Scan and Rapid-Scan Interferometers 43 a. Slow-Scanning Interferometers 43 b. Stepped-Scan Interferometers 45 c. Rapid-Scanning Interferometers 46 Phase Modulation 48 XI. References 55 CHAPTER 2. SAMPLING THE INTERFEROGRAM I. Sampling Frequency 56 IL Dynamic Range 65 References 80 CHAPTER 3. COMPUTING TECHNIQUES I. The Conventional Fourier Transform a. Elementary Concepts 81 b. Mathematical Basis 82 IL The Fast Fourier Transform 85 III. Phase Correction 93 IV. Interferogram Domain Processing 97 a. Smoothing 98 b. Interpolation by Zero Filling 98 c. Derivative Spectrometry 101 d. Fourier Self-Deconvolution ix
3 X CONTENTS V. Real-Time Fourier Transforms 106 VI. Fourier Transforms: A Pictorial Essay 108 a. Mertz Method 109 b. Forman Method 115 References 119 CHAPTER 4. TWO-BEAM INTERFEROMETERS 121 I. Drive Systems and Designs for Common Interferometers 121 a. Introduction 121 b. Medium-Resolution Far-Infrared Interferometers 121 c. Medium-Resolution Mid-Infrared Interferometers 122 d. Tut Compensation 142 II. Beamsplitters for Michelson Interferometers 147 III. Less Common Types of Interferometers for Fourier Spectrometry 158 a. Lamellar Gräting Interferometers 158 b. Polarizing Interferometers for Far-Infrared Spectrometry 161 c. Special-Purpose Interferometers 163 References 163 CHAPTER 5. AUXILIARY OPTICS FOR FT-IR SPECTROMETRY 166 I. Spectrometer Design 166 a. Introduction 166 b. Slow-Scanning Far-Infrared Fourier Spectrometer s 167 c. Single-Beam Rapid-Scanning FT-IR Spectrometer s 168 d. Double- or Multiple-Beam FT-IR Spectrometers 173 e. Optica! Throughput 177
4 CONTENTS II. Cells and Accessories for Absorption Spectrometry 181 a. Cells 181 b. Beam Condensers and Microscopes 182 c. Long-Path Gas Cells 183 III. Accessories for Reflection Measurements 187 a. Specular Reflection Spectrometry 187 b. Reflection-Absorption Spectrometry 188 c. Attenuated Total Reflectance Spectrometry 191 d. Diffuse Reflectance Spectrometry 194 IV. Infrared Emission Spectrometry 202 a. Laboratory Measurements 202 b. Measurements of Remote Sources 205 V. Sources for Fourier Spectrometry 208 VI. Infrared Detectors 209 a. Thermal Detectors 209 b. Quantum Detectors 213 c. Liquid-Helium-Cooled Detectors 216 References 217 CHAPTER6. DATA SYSTEMS 220 I. Historical Perspectives 220 II. Minicomputer Data Systems 223 a. Scope and Capabilities 223 b. Hardware 226 c. Software 230 III. Microcomputers 238 IV. Real-Time Data Systems and Array Prozessors 242 References 246
5 Xll CONTENTS CHAPTER 7. SIGNAL-TO-NOISE RATIO 248 I. Detector Noise 248 IL "Trading Rules" in FT-IR Spectrometry 254 a. Effect of Measurement Time 254 b. Effect of Resolution and Throughput 255 c. Effect of Apodization Function 258 d. Effect of Changing Mirror Velocity 259 III. Other Sources of Noise 261 a. Digitization Noise 261 b. Sampling Noise 262 c. Vibrations and Microphonics 267 d. Folding 268 e. Fluctuation Noise 269 f. Shot Noise 272 g. Sampling Errors 272 IV. Interferometers Versus Gräting Spectrometers 274 a. Theoretical Calculations 274 b. Practical Comparison 279 c. Far-Infrared Spectrometry 281 References 283 CHAPTER 8. REDUCTION OF DYNAMIC RANGE IN FT-IR SPECTROMETRY 284 I. The Dynamic Range Problem 284 IL Polarization Modulation 286 a. Vibrational Circular Dichroism 286 b. Linear Dichroism Spectrometry 293 c. Sample Modulation Spectrometry 297 III. Optical Subtraction 298 References 310 CHAPTER 9. PHOTOTHERMAL FOURIER SPECTROMETRY 312 I. Photoacoustic Spectrometry of Gases 312
6 CONTENTS Xlll II. Photothermal Infrared Spectrometry of Solids 315 a. Microphone Detection 315 b. Beam Deflection 316 III. Unconventional Photothermal Measurement Techniques 320 IV. Quantitative Considerations 323 V. Comparison with Other Sampling Techniques 332 References 335 CHAPTER 10. QUANTITATIVE ANALYSIS 338 I. Beer's Law 338 II. Spectral Subtraction 340 a. General Method 340 b. Instrumental Effects 344 c. Sample Effects 350 III. Single-Component Analysis 353 IV. Multicomponent Analysis 355 a. Factor Analysis 356 b. Least-Squares Methods 362 V. Conclusions 367 References 367 CHAPTER 11. DISPERSIVE FOURIER TRANSFORM SPECTROMETRY 369 I. Introduction 369 II. Gases and Vapors 374 III. Liquid Samples 376 IV. Solid Samples 381 References 384 CHAPTER 12. FT-IR SPECTROMETRY OF TIME-DEPENDENT PHENOMENA 386 I. Introduction 386 II. Spectrometry for Dynamic Systems 387 III. Transient Species in a Steady State 388 IV. Slowly Varying Systems 390 V. Rapidly Varying Systems 398 VI. Time-Resolved Spectrometry 407 References 423
7 XIV CONTENTS CHAPTER 13. FT-IR STUDIES OF POLYMERS 426 I. Introduction 426 II. Subtraction Studies 433 III. Polarization Studies 437 IV. Time-Resolved Studies 450 V. Conclusions 455 References 455 CHAPTER 14. BIOCHEMICAL AND BIOMEDICAL APPLICATIONS I. Introduction 457 II. Thermotropic Behavior of Lipids and Biomembranes 463 III. Kinetic and Mechanistic Studies of Enzyme Reactions 471 IV. Adsorption of Proteins from Blood 477 V. OtherWork 484 References CHAPTER 15. LOW-TEMPERATURE STUDIES I. Low-Temperature Spectrometers 487 II. Matrix Isolation 499 III. Semiconductor Measurements 513 References 518 CHAPTER 16. ATOMIC EMISSION SPECTROMETRY I. Instrumental Considerations 520 II. Sampling Frequency and Aliasing 527 III. Noise in Atomic Spectrometry 531 IV. Summary and Prognostication 533 References 534 CHAPTER 17. SURFACE ANALYSIS I. Introduction 536 II. Absorption Spectrometry 536 III. Diffuse Reflectance Spectrometry 544 IV. Photothermal Spectrometry 546 V. Reflection-Absorption Spectrometry 549 VI. Attenuated Total Reflectance
8 CONTENTS XV VII. Emission Spectrometry 557 VIII. Detection Spectrometry 560 IX. Summary 562 References 562 CHAPTER 18. GC/FT-IR SPECTROMETRY 564 I. Introduction 564 II. Hardware 569 a. Sampling 569 b. Light Pipe 575 c. Transfer Lines 579 d. Optics 583 e. Detectors 591 f. Gas Chromatographs 592 g. Dual-Beam GC/FT-IR 593 h. GC/FT-IR/MS Systems 598 III. Software 600 a. Data Collection 600 b. Gas Chromatogram Construction 602 c. GC/FT-IR Search Systems 607 IV. Conclusions 608 References 609 CHAPTER 19. THE HPLC/FT-IR INTERFACE 611 I. Flow Cell Techniques 611 a. Gel Permeation Chromatography 618 b. Normal-Phase HPLC 618 c. Reverse-Phase HPLC 623 II. Solvent Elimination Techniques 623 a. Normal-Phase HPLC 623 b. Reverse-Phase HPLC 627 III. Microbore HPLC/FT-IR 632 a. Flow Cells 632 b. Solvent Elimination Techniques 634 IV. Supercritical Fluid Chromatography 637 V. Conclusions 646 References 646 INDEX 648
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