The authors report the first astronomical detection of HCN J = 9 → 8 (797.433 GHz) emission. The line emitted from the Orion core shows two velocity components. One closely matches the low-velocity "plateau" component. The second probably originates in the "hot core" near IRc2. Both components have peak main-beam brightness temperatures of about 30K in a 32arcsec beam. The authors estimate the hydrogen density of the gas emitting the HCN line to be at least a few times 107cm-3 and probably near 108cm-3.
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Stutzki et al. (1988) studied this question.