Chapter 16 Study Guide

What is the difference between near, middle and far IR in terms of wavelength and wavenumber and what is the region most commonly used in IR spectroscopy?

Why are wavenumbers most commonly used in IR spectroscopy?

What must take place in a vibration of rotation such that it is IR visible

What are the basic types of molecular vibrations

What is the difference in IR spectra between gas and liquid samples?

Be able to describe anharmonic oscillator.

Why are molecular bonds best described as anharmonic?

Understand equations 16-7 and 16-9.

Quantum treatment of vibrations:

(Equation 16-3)

What is the main effect of the selection rules in IR and what are overtone lines.

Why don’t you normally see as many absorption bands as predicted by What is predicted: (16-A-4) (3N-5 FOR LINEAR MOLECULES) (3N-6 FOR NON-LINEAR)

What are three types of IR sources and how do they work?

What are Thermal transducers, Thermocouples and pyroelectric transducers. How do they work and what are they used for.

Be able to explain how FT IR works and know how to use equations. Know its 3 advantages (Page 182) be able to use equations 7-24, 7-25 and 7-33.

Homework:

16-3, 16-4, 16-6, 16-8, 16-9, 16-10a, 16-12, 16-13