The Mass Spectrometer
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An isotopic ratio mass spectrometer (IRMS) is used to determine the 18O to 16O ratios within a sample of CO2. The sample will produce 2 peaks of interest at 44 and 46. These two values represent the two most common arrangements of carbon dioxide (CO2). 
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Scan the sample and write down intensity values for 44 and 46m/z; you will need them for the next step in temperature determination.
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