Photoionization of (H2)2 and the clusters of O2 molecules

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Abstract
Photoionization of (H2)2 and clusters of O2 was investigated in a molecular beam experiment. No evidence was found for the existence of stable (H2)2+. Photoionization spectra of (H2)2 →hυ H3++H+e is quite similar to that of (H2) hν→H2++e, yet the appreciable differences in some features of spectra suggest that there is a competition between the autoionization and vibrational predissociation of vibronically excited (H2)2. From the photoionization thresholds of (O2)n, n=1–5, it is concluded that (O2)2+ is bound by 0.26±0.02 eV, but the additional binding energies for higher clusters of O2+ are much smaller; just about what one would expect from a charge induced dipole interaction.

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