A 330-360 GHZ SPECTRAL SURVEY OF G34.3+0.15 .2. CHEMICAL MODELING

We describe a detailed depth-and time-dependent model of the molecular cloud associated with the ultracompact H II region G 34.3+0.15. Previ ous work on observations of NH3 and CS indicates that the molecular cl oud has three distinct physical components:- an ultracompact hot core, a compact hot core and an extended halo. We have used the physical pa rameters derived from these observations as input to our detailed chem ical kinetic modelling. The results of the model calculations are disc ussed with reference to the different chemistries occuring in each com ponent and are compared with abundances derived from our recent spectr al line survey of G 34.3+0.15 (Paper I).