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Recent observations suggest that the behaviour of tracer species such asN_2H+ and CS is significantly different in regions of high and low mass starformation. In the latter, N_2H+ is a good tracer of mass, while CS is not.Observations show the reverse to be true in high-mass star formation regions.We use a computational chemical model to show that the abundances of these andother species may be significantly altered by a period of accelerated collapsein high mass star forming regions. We suggest these results provide a potentialexplanation of the observations, and make predictions for the behaviour ofother species.Comment: 5 pages, 3 figures To be published in the Astrophysical Journa

Molecular Abundance Ratios as a Tracer of Accelerated Collapse in Regions of High‐Mass Star Formation