CHEM1002 Study Guide - Quiz Guide: Nuclear Magnetic Resonance Spectroscopy, Infrared Spectroscopy, Mass Spectrometry
17 Jan 2019
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Infrared spectroscopy functional groups (whether particular bonds are present) Structural formula (position of individual atoms in a molecule) Empirical formula: simplest whole number ratio of atoms of each element in the compound. Molecular formula: actual number of each atom (how many molecule actually in) Molecule ionised by impact with electrons from vacuum (high energy electron to knock off an electron on molecule) Some ions fragment to form smaller ions (daughter ions -> help determine molecular structure) Daughter ions then accelerated through an electric field. Beam of ions directed into magnetic field to bend ions & detector measures how far ions are bent to work out mass. ** if an atom has 2 isotopes, there will be 2 molecular peaks. ** high resolution mass spec uses most abundant isotope. Each nuclei resonates at particular frequency in given magnetic field. Charged nuclei behave as if spinning about x-axis. In external magnetic field, they align parallel or anti-parallel to it.
