Volume 78, Issue 1, January 2007
Index of content:
The National Aeronautics and Space Administration’s Spitzer Space Telescope (formerly the Space Infrared Telescope Facility) is the fourth and final facility in the Great Observatories Program, joining Hubble Space Telescope (1990), the Compton Gamma-Ray Observatory (1991–2000), and the Chandra X-Ray Observatory (1999). Spitzer, with a sensitivity that is almost three orders of magnitude greater than that of any previous ground-based and space-based infrared observatory, is expected to revolutionize our understanding of the creation of the universe, the formation and evolution of primitive galaxies, the origin of stars and planets, and the chemical evolution of the universe. This review presents a brief overview of the scientific objectives and history of infrared astronomy. We discuss Spitzer’s expected role in infrared astronomy for the new millennium. We describe pertinent details of the design, construction, launch, in-orbit checkout, and operations of the observatory and summarize some science highlights from the first two and a half years of Spitzer operations. More information about Spitzer can be found at http://spitzer.caltech.edu/.
Field and laboratory emission cell automation and control system for investigating surface chemistry reactions78(2007); http://dx.doi.org/10.1063/1.2432243View Description Hide Description
A novel system [field and laboratory emission cell (FLEC) automation and control system] has been developed to deliver ozone to a surface utilizing the FLEC to simulate indoor surface chemistry. Ozone, humidity, and air flow rate to the surface were continuously monitored using an ultraviolet ozone monitor, humidity, and flow sensors. Data from these sensors were used as feedback for systemcontrol to maintain predetermined experimental parameters. The system was used to investigate the chemistry of ozone with -terpineol on a vinyl surface over . Keeping all other experimental parameters the same, volatile organic compound emissions from the vinyl tile with -terpineol were collected from both zero and ozone exposures. System stability profiles collected from sensor data indicated experimental parameters were maintained to within a few percent of initial settings. Ozone data from eight experiments at (over ) provided a pooled standard deviation of and a 95% tolerance of . Humidity data from 17 experiments at 50% relative humidity (over ) provided a pooled standard deviation of 1.38% and a 95% tolerance of 2.77%. Data of the flow rate of air flowing through the FLEC from 14 experiments at (over ) provided a pooled standard deviation of and a 95% tolerance range of . Initial experimental results yielded long term emissions of ozone/-terpineol reaction products, suggesting that surface chemistry could play an important role in indoor environments.