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Cover Instrumental Analysis (International Edition)

Infrared Spectroscopy  

This chapter focuses on infrared (IR) spectroscopy, which is used to probe molecular vibrational modes and gives substantive insight into the molecular structure of the analyte. It explains that a vibrational mode is a unique vibration within a molecule in which all atoms involved in the vibration have a sinusoidal motion and the motion of all of the atoms shares the same phase. It also considers the determination of the types of bonds that exist within a molecule as one of the main uses of IR spectroscopy. The chapter highlights the three regions of the IR spectrum: near-IR, mid-IR, and far-IR, which are named based on their anthropocentric relationship to the human eye's lower detection limit. It draws attention to mid-IR radiation, which is used to probe the primary vibrational modes associated with the bonds within a molecule.