ABSTRACT
Ion mobility spectrometric (IMS) analyses of aromatic hydrocarbons and nitrogen and sulfur-containing compounds were performed by using a Phemto-Chem 100 ion mobility spectrometer. The ion mobility spectra of nitrogen-containing heterocyclic, alkyl sulfides, aromatic hydrocarbons, aromatic amines, fatty acids, and phenolic compounds were recorded. The mobility of the ions depends upon not only the molecular weight, but also the size and shape of the ions. Ions of saturated heterocyclic compounds drifted slower than those of pyridine derivatives with similar molecular weights. In general, bulky ions required larger drift times than compact ions for different compounds with the same molecular weight and same functional groups. In IMS, organic molecules are ionized at high efficiency to produce molecular ions under an atmospheric pressure ionization process. The ion mobility spectra of positive ions produced from benzene and its derivatives, and from condensed polyaromatic hydrocarbons were measured.
