Fig. 2: Mass spectra of a filter inlet for gases and aerosols coupled to a chemical ionization mass spectrometer (FIGAERO-CIMS) and their comparison between single- and multi-precursor systems.
From: Non-linear effects of secondary organic aerosol formation and properties in multi-precursor systems
FIGAERO-CIMS mass spectra in a pure α-pinene (APN), b pure limonene (LIM), c sequential oxidation (SEQ), and d simultaneous oxidation (MIX) experiments, colored by the number of nitrogen atoms in the assigned molecular formulae. Monomer, dimer, and trimer regions are shaded. Comparison of the mass spectra observed in e SEQ and f MIX experiments with those predicted based on linear combinations of APN and LIM experiments. Solid line indicates 1:1 and dashed lines represent a deviation by a factor of 2. Data points are labeled and colored by nominal m/z. θ is a spectral contrast angle, and fAPN and fLIM indicate the signal fractions of APN and LIM experiments contributing to secondary organic aerosol estimated via multiple linear regression analysis, respectively.
