Electron bombardment matrix isolation of Rg/Rg^′/methanol mixtures (Rg= Ar, Kr, Xe): Fourier-transform infrared characterization of the proton-bound dimers $Kr2H+,$ $Xe2H+,$ $(ArHKr)+$ and $(ArHXe)+$ in Ar matrices and $(KrHXe)+$ and $Xe2H+$ in Kr matrices

Matrices formed by subjecting methanol vapor diluted in argon/krypton mixtures to electron bombardment and subsequent matrix isolation (EBMI) reveal a new feature at 885.3 $cm−1$ which is assigned to the $v3$ fundamental of the triatomic cation $(ArHKr)+.$ In samples containing about 5% krypton, the $v3$ fundamental of $Kr2H+$ is also observed in a predominantly solid argon environment. These assignments are supported by annealing experiments and by density functional theory calculations reported in a separate paper. Similar experiments with xenon diluted in argon yield infrared spectra showing the $v3$ and $v3+v1$ bands of $(ArHXe)+$⁠, and $v3$ of $Xe2H+$ in predominantly argon environments. EBMI of methanol diluted in krypton in the presence of xenon gives rise to infrared bands assigned to the $v3$ and $v3+v1$ fundamentals and combination bands of both $(KrHXe)+$ and $Xe2H+$ isolated in predominantly krypton environments. The energetics and plausible mechanisms to the formation of these homogenous and mixed proton-bound rare-gas dimers are considered.