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Table 1

Collisional processes for the HCN rotational levels.

Process Rate (cm3 s-1) σ** Tdep* Jdep+

HCN-N2 see text 0.2–5 yes yes
HCN-CH4 2.6e-12 0.1–10 no no
HCN-H2 see text 0.2–5 yes yes
HCN-electrons see text 0.2–5 yes yes



A factor of uncertainty considered for the sensitivity study.


Temperature dependence of the col. rates.


Rates dependent on the J quantum number.

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