Neutral sodium-water clusters are formed in a "pickup" source, injection of a beam of Na atoms into the expansion zone of a pulsed nozzle-jet beam of water vapor seeded into an argon carrier gas. They are detected by near-uv one-photon ionization with a pulsed laser and time-of-flight mass spectroscopy. Na(H₂O)ₙ-cluster-ion signals up to $n=12$ are seen, $n=4$ showing a very pronounced abundance. The ionization potential of NaOH₂ is determined to be 4.379 ±{} 0.002 eV.
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Schulz et al. (1986) studied this question.
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