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We present a new code for solving the molecular and atomic excitation andradiation transfer problem in a molecular gas and predicting emergent spectra.This code works in arbitrary three dimensional geometry using unstructuredDelaunay latices for the transport of photons. Various physical models can beused as input, ranging from analytical descriptions over tabulated models toSPH simulations. To generate the Delaunay grid we sample the input modelrandomly, but weigh the sample probability with the molecular density and otherparameters, and thereby we obtain an average grid point separation that scaleswith the local opacity. Our code does photon very efficiently so that the slowconvergence of opaque models becomes traceable. When convergence between thelevel populations, the radiation field, and the point separation has beenobtained, the grid is ray-traced to produced images that can readily becompared to observations. Because of the high dynamic range in scales that canbe resolved using this type of grid, our code is particularly well suited formodeling of ALMA data. Our code can furthermore deal with overlapping lines ofmultiple molecular and atomic species.

LIME - a flexible, non-LTE line excitation and radiation transfer method for millimeter and far-infrared wavelengths