HCN, HNC and DNC spectra of 27 sources

The ratio between the two stable isotopes of nitrogen, ^14^N and ^15^N, is well measured in the terrestrial atmosphere (~272), and for the pre-solar nebula (~441, deduced from...

氮的两种稳定同位素¹⁴N与¹⁵N的比值，在地球大气（terrestrial atmosphere）中已被精准测定，约为272；而在前太阳星云（pre-solar nebula）中该比值约为441，该数值由……推导得出。