Interpreting Diffuse Reflectance and Transmittance: A Theoretical Introduction to Absorption Spectroscopy of Scattering Materials

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A jar of sweets may not appear to be a serious introduction to the attempt to progress the understanding of the challenging nature of what is usually termed "diffuse reflection". However, this book by the father and son team of Don and Kevin Dahm is the first such attempt since the famous book by Wendlandt and Hecht some forty year ago.

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The sweets are not only useful models, they also indicate the desire of the authors to make this a readable and entertaining book as well as a very serious attempt to advance our theoretical understanding of this complex and confusing topic.

The Dahms have been developing and advancing a new theory for the last few years. This book brings it together. It explains the nature of reflected radiation and then the problem of finding a mathematical description of it. In their quest, they have rediscovered and used mathematics that was invented by Sir George Strokes in the 1860s!

Much of the current use of near infrared spectroscopy utilizes diffuse reflection or transmission. According to Karl Norris "The development of NIR analysis is being restricted by our lack of a theoretical understanding of diffuse reflection" and he should know!

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    Donald J. Dahm and Kevin D. Dahm
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  • Preface/Introduction
  • Approach Used in the Representative Layer Theory
  • Background and Such (the Stuff Spectroscopists Are Supposed to Know)
  • Redoing the Basics of the Spectroscopist's Theory of Absorption for Scattering Samples
  • Application of Spectroscopic Theory to Scattering Samples
  • Remission From and Transmission Through Layers of Modified Sheets
  • Relationships Proportional to the Absorbing Power
  • Remission From and Transmission through a Representative Layer of Particles
  • Additional Theoretical Considerations
  • The Continuum Theories
  • Perspective on the Theory of Diffuse Reflectance
  • Appendix 1. Definition of Terms and Symbols
  • Appendix 2. References
  • Preface to Appendix III by Donald J. Dahm
  • Preface to Appendix III by Harry G. Hecht
  • Appendix III. Theory of Diffuse Reflectance

Professor Donald J. Dahm is a professor at Rowan University. In 2004, Dr. Dahm received the Outstanding Achievement in Near Infrared Spectroscopy Award from the Eastern Analytical Symposium.

Professor Kevin D. Dahm is a Professor at Rowan University in the Department of Chemical Engineering. He is the author or co-author of 36 Refereed Journal Articles published in Chemical Engineering Education, Education for Chemical Engineers, Journal of Engineering Education Transformations, Journal of STEM Education, Advances in Engineering Education, Journal of Near-Infrared Spectroscopy, Applied Spectroscopy and Journal of Analytical and Applied Pyrolysis.

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