Future opportunities for FIR infall studies towards star forming regions
Observation of infall is key to our understanding of the accretion process in star formation. High-resolution spectroscopy allows us to resolve molecular lines originating from the dense molecular envelopes of the forming (proto-) stars to deduce the kinematics of the gas. In particular observations of red-shifted absorption are a direct probe of infall. Here I will summarize the results so far and discuss new observational opportunities with new instrumentation.