Proposed Measurements of Photoabsorption Cross Sections of Solar System and Cosmic Gases Under In-Situ Conditions

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Dr. Wu will continue his laboratory measurements of low temperature absorption cross sections of molecules of interest in the study of planetary atmospheres, comets, nebulae, and interstellar clouds. The measurements are made in the near visible through the ultraviolet region of the spectrum. The pressure, temperature, and relative abundance of the sample of gas of interest will be chosen to simulate realistic planetary conditions. Accurate knowledge of photo-cross sections of relevant molecular systems is essential for understanding the dynamics of photochemical processes in our atmosphere and those of the other planets. Dr. Wu's measurements deal with the spectral range where there is plenty of radiation from the Sun, and they are extremely relevant for the interpretation of phenomena occurring in planetary atmospheres that are stimulated by ultraviolet radiation.