Elsevier

Chemical Physics Letters

Volume 185, Issues 3–4, 18 October 1991, Pages 324-329
Chemical Physics Letters

Pulsed-glow discharge/matrix isolation method for the production and trapping of organic ions: application to para-dimethoxybenzene

https://doi.org/10.1016/S0009-2614(91)85068-8Get rights and content

Abstract

A new technique for the production and trapping of organic ions in rare-gass matrices is introduced. A pulsed-glow discharge produces the ions which are repelled from a hemispherical wire-mesh grid held at a high positive (or negative) potential toward the cold (12 K) sample window of a closed-cycle cryostat where they are deposited. The radical cation of para-dimethoxybenzene (PDMOB) has been formed by this method in sufficient quantities to observe a number of its infrared spectral bands for the first time. The electronic absorption spectrum of the cation matches well with results obtained by γ-irradiation of PDMOB in s-butylchloride matrices at 77 K and by oxidation of adsorbed PDMOB in Cu-exchanged montmorillonite clay. The introduction of CCl4 into the argon plasma gas stream significantly enhances the number of ions produced and trapped.

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