CHMA10H3 Lecture Notes - Lecture 7: Mass Spectrometry, Mass Spectrum, Spectroscopy
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CHMA10H3 Full Course Notes
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Document Summary
Techniques to identify molecues; structure and bonding - chapter 3. 3 dimensional space that occupies space: mass spectrometry used for safety ( bomb, chemicals, drug = finding them/ detecting) Infrared technology= sensor systems that can be remotely control and remotely detecting threat molecules (biological or chemical agents, acid rain, pesticides) High-resolution mass spectrometry: high resolution mass spectrometry of a pure molecular substance gives an accurate value of the relative mass of molecules with various isotopic composition to seven decimal places. From this information, one can determine the formula and composition of the compound. Mass spectroscopy terminology: ex: the mass spectrum of chloroethane is shown: which isotopologues cause the two molecular ion peaks at m/z=64 and m/z=66 = distingue by isotopic mass. Isotopologues are molecules that are identical except that their atoms have different isotopic composition: a molecular ion is formed by ejection of one electron in which case the charge, z, is 1.
