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or methyl cation CH₃⁺, methane cation CH₄⁺, and methanium or protonated methane CH₅⁺. Some of these have been detected in outer space. Methanium can also be produced as diluted solutions from methane with superacids. Cations with higher charge, such as CH₆²⁺ and CH₇³⁺,

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