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…using the following parameters:
(1.a) Compute abundance ratios of 13C/12C, 17O/16O and 18O/16O
(1.b) Compute abundances of 12C, 13C, 16O, 17O and 18O
(1.c) Compute abundances of isotopologues with masses 44 to 49
…by making the assumption that your reference gas is stochastic (this is usually not true, but we correct for that later in the process).
(1.d) Compute binned abundances of isotopologues grouped by mass
(2.a) Measure the abundance ratios of your sample gas for masses 45 to 49
…based on voltage measurements from your dual-inlet spectrometer:
Ideally, these voltages reflect abundance ratios, so that:
And, using the conventional δ notation (relative to your reference gas):
(2.b) Compute the bulk composition of your sample gas
(to be continued soon)