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quadrupole definition
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a “double dipole”;  a molecule with a quadrupole will have no dipole moment because the two dipoles present in the molecule cancel each other out.  A good example is carbon dioxide. Definition for  quadrupole mass filter : used in mass spec, this tool has four voltage-carrying rods which serve to give ions which travel between them oscillations.  Only ions with the right mass/charge ratio (m/z) can undergo these oscillations without hitting one of these rods.

See also:
purge volume definition
radiometer definition
R*, S* definition
ramp-up definition
radiation definition
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