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Spectroscopy VCE Unit 3
Terms in this set (28)
The proportion of incident electromagnetic radiation absorbed by the sample.
Atomic Absorption Spectroscopy (AAS)
An analytical technique that uses light absorption to measure the concentration of a metal in a sample.
Atomic Emission Spectroscopy (AES)
An analytical technique that uses light emission to measure the concentration and identity of a metal in a sample.
Calibration Graph (Curve)
A plot of data involving two variables that are used to determine values for one of the variables.
Nuclear magnetic resonance utilising the interaction of the 13C nucleus with an external magnetic field and electromagnetic radiation. Used to determine the chemical environment of carbon atoms in compounds.
Frequency of the signal in the NMR spectrum, relative to the TMS standard.
An instrument that enables the determination of the concentration of a coloured solution by measuring the amount of light passing through a sample.
An analytical technique that uses the amount of light of a particular wavelength absorbed by a sample to determine concentration.
All possible frequencies of electromagnetic radiation shown in wavelength order.
Electronic Energy Levels
Definite fixed energies that electrons in an atom or molecule can take.
A display of the wavelengths of light emitted by a substance. For many metals this appears a coloured lines on a black background.
Electrons that have absorbed particular quantities of energy and moved from their ground states to higher energy levels.
In chemical analysis, a spectrum or analysis that is unique to a particular chemical.
Atoms or groups of atoms in an organic molecule that largely determine the molecule's properties and reactions.
Infrared Spectroscopy (IR)
An analytical technique that uses the infrared part of the electromagnetic spectrum.
Nuclear Magnetic Resonance Spectroscopy (NMR)
A technique used to analyse materials using the interaction of the nucleus of particular atoms, usually 1H or 13C, with an external magnetic field and electromagnetic radiation.
Nuclear magnetic resonance using the differences in the magnetic properties in 1H atoms in the compounds. Often written as 1H NMR.
A cell that contains a reference material, such as pure solvent, and is used for the purpose of comparison in an instrumental analysis.
Rotational Energy Levels
Different fixed energies that a molecule with a dipole moment can have as result of rotation around a bond.
A cell in an analytical instrument that contains the sample to be analysed.
Major energy levels around the nucleus of an atom in which electrons move; shells are numbered 1, 2, 3 etc.
A display of the wavelengths of light that are either emitted or absorbed by a substance.
A region of the electromagnetic spectrum with wavelengths smaller than that of violet light.
An analytical technique involving measurement of the UV-visible light absorbed by a substance.
Vibrational Energy Levels
Different fixed energies that molecules can have as a result of the bending and stretching of bonds.
Inverse of the wavelength of the radiation, measured in cm^-1, used as a measurement of frequency in infrared spectroscopy.
The distance between successive peaks in a wave.