CHEM 360 Lecture Notes - Lecture 3: Ideal Gas Law, Absorbance, Irradiance
4 May 2019
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Atmospheric unit conversion, the physics, chemistry, and biology of uv. Impact = population * affluence * technology. O3 layer that is not supposed to be there. Absolute - number of molecules per cm 3. Need to be able to convert between the two. Use the ideal gas law to convert between ppm and molecules per cm 3. Filtering of sunlight"s uv component by atmospheric o2 and o3. X rays have the smallest wavelength and the largest energy, then uv, then. Uv light is the most important for us in this class. When a sample absorbs light, the irradiance of the beam of light decreases. Irradiance, p is defined as energy per second per unit area of the light beam. Mostly filtered by o 3 and o 2 together but a decent amount still reaches the. (a) 150 nm (b)200 nm absorption of o 3. Ozone, aided by oxygen at the shorter wavelengths, filters out all of the sun"s.
