An upper limit of the column density of the C5 linear molecule in translucent interstellar clouds is estimated from high-resolution (R = 80 000) and very high signal-to-noise ratio (∼1000) echelle spectra. It is 1012cm−2 per E(B — V) = 1 (two orders of magnitude lower than that of C2).
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Галазутдинов et al. (2001) studied this question.
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