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Deuterated ions are abundant in cold (T=10 K), dense (n=10^5 cm^-3) regions,in which CO is frozen out onto dust grains. In such environments, the deuteriumfractionation of such ions can exceed the elemental abundance ratio of D/H by afactor of 10^4. In this paper we use the deuterium fractionation to investigatethe evolutionary state of Class 0 protostars. In a sample of 20 protostellarobjects, we found a clear correlation between the N2D+/N2H+ ratio andevolutionary tracers. As expected, the coolest, i.e. the youngest, objects showthe largest deuterium fractionation. Furthermore, we find that sources with ahigh N2D+/N2H+ ratio show clear indication for infall.

The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars