Spitzer Space Telescope - Guaranteed Time Observer Proposal #120 Study of new 16.4 micron PAH feature Principal Investigator: Dale Cruikshank Institution: NASA-Ames Science Category: ISM Observing Modes: IrsStare Hours Approved: 1.7 Abstract: These are four sources to be added to Cruikshank's existing program on the study of a new 16.4 micron PAH feature.