赤外分光測定法--基礎と最新手法補講第13回　22．赤外分光学とフーリエ変換分光法の基礎

摘要

本講座は，「赤外分光測定法」に関するものであるという性格上，その基本に関係する理論面の説明が十分ではない場合があることは否めない．今回の講座の企画を編集委員会に提案した者として，本講座での説明不足を少しでも補うため，この補講を行うこととした．%Some fundamental aspects of infrared spectroscopy and Fourier transform spectrometry, which were either lightly mentioned or scarcely referred to in this lecture series, are explained in detail. (1) The relation among the speed, frequency, wavelength, and wavenumber of an electromagnetic wave is discussed. (2) The formulas expressing the electric vector of a propagating electromagnetic wave are examined. (3) Coherence of thermal radiation is discussed. (4) Fourier transforms and related mathematical methods necessary for understanding fully the principles of Fourier transform infrared spectrometry are discussed. Particularly, the properties of the Dirac delta function are described. (5) The relation between an extremely short radiation pulse in the time domain and its spectrum in the frequency domain is explained.