An experimental procedure for ESR studies of rare gas matrix isolated molecular cation radicals: 12CO+, 13CO+, 14NH3+, and 15NH3+

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Abstract
A generally applicable technique is described that enables the ESR study of molecular cation radicals isolated in neon matrices at 4 K. Preliminary evidence indicating the possible use of the method for the study of ion‐neutral reactions is briefly discussed. The ’’gaslike’’ nature of the trapped matrix ions is demonstrated by a comparison with gas phase results for 13CO+, one of the few radical cations studied by high resolution microwave spectroscopy. Application of the method to the following radical cations is presented in this report: 12CO+, 13CO+, 14NH3+, and 15NH3+. The ions are produced during neon matrix deposition by photoionization with an open tube neon discharge source (16.8 eV).