| http://www.w3.org/ns/prov#value | - ?????? it appears that ion-neutral reactions occur in the upper atmosphere to produce polycyclic aromatic hydrocarbons (PAHs) as well as heterocyclic compounds involving nitrogen???. methane, cyanogen, benzene, and other organic molecules up to 100 daltons???. larger molecules such as naphthalene, anthracene derivatives, and an anthracene dimer???. heavy negative ions, with masses up to 8,000 Da,
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