Low Voltage Mass Spectrometric Sensitivities of Aromatics

Mass spectrometric sensitivity data for low voltage electron impact ionization of alkylpyrenes

“…This effect can be explained by the superposition of the following factors: (1) As has been demonstrated for benzene (e.g., in ref 5), the probability of ionization increases with increasing alkyl chain length. (2) The degree of fragmentation increases with increasing electron energy. For alkyl groups with a chain length >2, this usually results in an ion of mass 215, analogue to tropylium.…”

Mass Spectrometry in Organic Geochemistry

“…The technique makes possible also the analysis of aromatics and olefins in mixtures with saturated compounds, since the latter possess appreciably higher ionization potentials (10-13 e. v.). First developed by FIELD and HASTINGS [151], the method has found wide application to the analysis of aromatic hydrocarbon mixtures [169][170][171][172]. Considering the developments in field ionization [21,23] and the recent introduction of chemical ionization methods [22], it is to be expected that these techniques will find application to mixture analyses.…”

Mass Spectra of Derivatives of o-Aminobenzoic Acid.

“…38, 1430Chem. 38, (1966 ], on page 1433 the Note in column 2 states that "the Hersch Cell" is the property of Engelhard Industries, Inc. To avoid any misunderstanding: the Company named does hold U. S. Patent 2,805,191 (misprinted as 2,805,701) but it does not hold any of a series of other cells also originated by Hersch. Some of these, like the galvanic-coulometric cell of U. S. Patent 3,223,597 also relate to oxygen, others to a number of different gases; the British Patent 880,965 relates specifically to gas chromatography.…”