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usually helium. This gas in turn is forced through a thin heated tube. It is here the sample is broken into its component chemicals. A mass spectrometer (MS) is then analyses these chemical ...

Invented a half-century ago by Nobel laureate Wolfgang Paul, the quadrupole mass filter has become an integral part of some of the most sophisticated mass spectrometers. Consisting of four parallel ...

Berkeley Lab geochemist B. Mack Kennedy used this mass spectrometer (foreground) to determine helium isotope ratios in samples of surface fluids from the northern Basin and Range. Disclaimer ...