Mass Spectrometry and IR Spectroscopy

Mass Spectrometry and IR Spectroscopy -- Section 11 of Organic Chemistry Notes is 9 pages in length (page 11-1 through page 11-9) and covers ALL you'll need to know about the following lecture/book topics:

SECTION 11 - Mass Spectrometry and IR Spectroscopy

11-1 -- Mass Spectrometry (MS)
_· Molecular Weight Determination
_· Fragmentation into Smaller Radicals and Cations
_· Purpose of Magnetic Field
_· A Typical Mass Spectrum: n-Octane
_· Parent Peak and Base Peak
_· Mass-to-Charge Ratio (m/z)
_· Parent Ion (or “Molecular Ion”)
_· Fragment Peaks (Fragment Ions) and Isotope Peaks (Isotope Ions)
_· Relative Intensity
11-5 -- Review of Electromagnetic Radiation (“light”)
_· Energy Equations
_· Variables and Constants
_· Wavenumber (cm-1)
11-5 -- Infrared Spectroscopy
_· Definition of IR Spectroscopy
_· Graphical Plot of % Transmittance vs. Wavenumber (cm-1)
_· Stretching vs. Bending
_· The “Fingerprint Region”
11-7 -- Frequency (Wavenumber) and Intensity of IR Absorption
_· Types of IR Vibrations
_· Bond Strengths
_· CΞC > C=C > C-C
_· C(sp)-H > C(sp2)-H > C(sp3)-H
_· Frequency Dependence on Masses of Bonded Atoms
_· Intensity of Absorption and its Dependence on Dipole Moments
_· The Number of Identical Bonds Influences the Intensity of IR Peaks
11-8 -- Table of IR Stretches for Common Functional Groups
11-9 -- Four Sample IR Spectra



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Mass Spectrometry and IR Spectroscopy

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