Mass Spectroscopic Determination of Photoionization Products

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Abstract
A radio‐frequency mass spectrometer of the Bennett type has been utilized to measure the mass of ions formed by photoionization of several gases by the ultraviolet radiation of a hydrogen discharge. Investigations were performed up to 11.4 electron volts, the LiF cutoff. The mass spectra were found to be very simple and usually consisted of only one peak representing the mass of the whole molecule. This has been found to be true for acetone, butadiene, butene, carbon disulfide, methyl‐ethyl ketone, nitric oxide, propylene, and toluene. Only in the case of butane, ethyl acetate, and isopropyl alcohol, fragment ions have been found. Some of them are even more intense than the parent ions. Undesirable ``secondary spectra,'' reported by Lossing and Tanaka, can be avoided by grounding of the lithium fluoride window.

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