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Comparison of linewidths of spectral line profiles of ions and neutralmolecules have been recently used to estimate the strength of the magneticfield in turbulent star-forming regions. However, the ion (HCO+) and neutral(HCN) species used in such studies may not be necessarily co-evolving at everyscale and density and may thus not trace the same regions. Here, we use coupledchemical/dynamical models of evolving prestellar molecular cloud coresincluding non-equilibrium chemistry, with and without magnetic fields, to studythe spatial distribution of HCO+ and HCN, which have been used in observationsof spectral linewidth differences to date. In addition, we seek new ion-neutralpairs that are good candidates for such observations because they have similarevolution and are approximately co-spatial in our models. We identify threesuch good candidate pairs: HCO+/NO, HCO+/CO, and NO+/NO.

A search for co-evolving ion and neutral gas species in prestellar molecular cloud cores