Anthraquinone vapor pressure

Nelson, O.A., Senseman, C.E. (1922) Vapor pressure determinations on naphthalene, anthracene, phenanthrene, and anthraquinone between their melting and boiling points. Ind. Eng. Chem. 14, 58-62. 

It was also observed that if the NO pressure was raised above 15-40 torr the quenching efficiency diminished with anthraquinone, / -hydroxyanthraquinone, and jS-aminoanthraquinone in both the vapor and adsorbate with /3-methylanthraquinone quenching diminished in the adsorbate but not in the vapor. To explain these observations, Karyakin et al. introduced the following quenching mechanism for the first three molecules and the adsorbate of / -methylanthraquinone (all called A for simplicity)... 

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