Calculation of the areas of peaks in measurements of isotopic ratios using MI-1201SG mass spectrometer

The peak shape model for magnetic sector and time-of-flight mass spectrometers

“…For magnetic sector mass spectrometer, in contrast to the parameter s, the value is constant for a given mass spectrum, which confirmed experimentally [34].…”

“…This fact must be considered for more precise description of partially overlapped signals. It was shown [34], that half-width of the collector slit, expressed in m/z units, can be determined from the geometry of the mass analyzer. Taking into account a variable width of the collector slit we can rewrite the peak shape model for magnetic sector mass spectrometers as:…”

“…As for the function of the density distribution, then based on experimental data and results of computer simulation of ion sources and mass analyzers [38][39][40][41] we can conclude that in general case this is an asymmetric unimodal distribution. In our previous works [33,34], we used the Gaussian modified according to Fraser and Suzuki [42] as the distribution function:…”

“…In present study we extended the previously proposed peak shape model of the magnetic sector mass spectrometers [33,34] to the TOF instruments and developed a general peak shape model for these types of mass spectrometers. The main requirements for proposed model were account for the basic physical principles of the signal formation on the mass spectrometer detector and adequate description of the experimental signal (in terms of minimum sum of squared residuals).…”