Refurbished Hewlett Packard (Agilent) Mass Spectrophotometers,

HP 5970	HP 5971	HP 5972	HP 5973	HP 5988A

Mass spectrometers are used in both quantitative and qualitative analysis, including high-resolution accurate mass measurements for the determination of elemental compositions. Mass spectrometry (MS) is an analytical spectroscopic tool primarily concerned with the separation of molecular (and atomic) species according to their mass. MS can be used in the analysis of many types of samples, from elemental to large proteins and polymers.

Important performance parameters to consider when specifying mass spectrometers include mass range, resolution, mass accuracy and mass spectrum. Mass range is a measure of the atomic mass range detected by the spectrometer in Atomic Mass Units. May also be measured in Daltons. The resolution is the ratio of the mass divided by the change in mass over the area of two peaks. (m/dm). The mass spectrum is a spectrum obtained when ions (usually in a beam) are separated according to the mass-to-charge (m/z) ratios of the ionic species present. This plot is a graphical representation of m/z values versus measured ion abundance information.