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to a temperature at which HNC would already have been destroyed by neutral-neutral reactions.

Spectral properties

In practice, HNC is almost exclusively observed astronomically using the J = 1->0 transition. This transition occurs at ~90.66 GHz, which is a point of good visibility in the atmospheric window, thus making astronomical observations of HNC particularly simple. Many other related species (including HCN) are observed in roughly the same window.

Significance in the interstellar medium

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