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IPN 074-397-P1G
HAPSITE Smart Operating Manual
LMB . . . . . . . . . . . . . . . . . . . . . . . . . Left Mouse Button.
Mass Calibration . . . . . . . . . . . . . . A function of the HAPSITE which uses
internal standard gas to check the alignment
of masses, and also to check the relative
intensities of the tune masses.
Mass Fragment. . . . . . . . . . . . . . . . A molecule (or ion) resulting from the
break-up of a parent molecule.
Mass Defect . . . . . . . . . . . . . . . . . . The effect on a mass spectrum of the
difference between the atomic weight of a
compound or fragment and a whole number.
Mass spectrum . . . . . . . . . . . . . . . . A display of the amount of each mass
fragment present at the specific time, plotted
as amplitude vs. molecular weight.
MDP . . . . . . . . . . . . . . . . . . . . . . . . . Molecular Dispersion Pump.
Membrane Isolation Valve . . . . . . . The valve which supports the Mass
Spectrometer’s inlet membrane and (when
closed) interrupts the flow of analyte from the
membrane into the Mass Spectrometer.
Method . . . . . . . . . . . . . . . . . . . . . . A set of instructions for a function of the
HAPSITE.
Molecular Weight . . . . . . . . . . . . . . The AMU representation of the total number
of protons and neutrons in a specified
molecule.
MS . . . . . . . . . . . . . . . . . . . . . . . . . . Mass Spectrometer.
ms . . . . . . . . . . . . . . . . . . . . . . . . . . milliseconds.
MSDS. . . . . . . . . . . . . . . . . . . . . . . . Material Safety Data Sheet.
Multiplier Voltage . . . . . . . . . . . . . . The voltage applied to the multiplier in the
mass spectrometer, which directly effects the
amplitude of signal and background noise.
NEG . . . . . . . . . . . . . . . . . . . . . . . . . Non-evaporative getter as a vacuum source.
NIST Library . . . . . . . . . . . . . . . . . . National Institute of Standards and
Technology Mass Spectral Library,
commonly referred to as NIST. This is a
library of spectra of compounds which can be
searched to tentatively identify unknown
compounds.