Spitzer Space Telescope - Guaranteed Time Observer Proposal #93 Survey of PAH Emission, 10-19.5 um Principal Investigator: Dale Cruikshank Institution: NASA-Ames Science Category: evolved stars/pn/sne Observing Modes: IrsStare Hours Approved: 15.2 Abstract: A survey of the emission bands in the region 10-19.5 um, in planetary nebulae, proto-planetary objects, YSOs/HII regions, and related sources. The study will focus on the emission band at 16.4 um, attributed to PAHs, and will include the plateau of emission that extends from 15 um to the long wavelength limit of the Short-High IRS module.