Can we observe the ion-neutral drift velocity in prestellar cores?

Given the low ionization fraction of molecular clouds, ambipolar diffusion is thought to be an integral process in star formation. However, chemical and radiative-transfer effects, observational challenges, fact that ion-neutral drift velocity inherently very small render a definite detection extremely non-trivial. Here, we study suite chemodynamical, non-ideal magnetohydrodynamic (MHD), two-dimensional axisymmetric simulations prestellar cores where alter temperature, cosmic-ray rate, visual extinction, mass-to-flux ratio, evolution. Subsequently, perform number non-local thermodynamic equilibrium (non-LTE) calculations considering various idealized non-idealized scenarios order assess which factor (chemistry, radiative transfer and/or difficulties) most challenging overcome our efforts detect velocity. We find temperature has significant effect amplitude with coldest modelled (T = 6 K) exhibiting velocities comparable sound speed. Against expectations, (where two species are perfectly chemically co-evolving) ``survives" effects can principle observed. challenges significantly hinder view Finally, propose $\rm{HCN}$ $\rm{HCNH^+}$, being co-evolving, could used future studies aiming measure