Experiment 6 - Greenhouse Gas and Stratospheric Ozone

Experiment 6 - Greenhouse Gas and Stratospheric Ozone -...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 257 Greenhouse Gas and Stratospheric Ozone In this lab, you will investigate two current environmental problems. The sun produces sunlight that has a maximum emission wavelength in the visible (yellow, 483nm). This is due to the sun’s approximately 5000K temperature. The broad emission extends from the UV through the visible maximum and into the infrared part of the spectrum from 800 to 3000nm. Most of the energy content is in the UV and visible emission. We will use a fiber optic probe on an Ocean Optics monochrometer to measure the radiation from the sun that gets to the earth. The very high energy UV (below 190nm) from the sun is absorbed by the oxygen and water vapor in our atmosphere. These photons cause sigma bonding electrons to under go electronic transitions. The energy of this light would be extremely damaging to life since it has enough energy to break down almost all chemical bonds. Life on earth is thought to not have been possible until sufficient oxygen was present in the atmosphere to filter out this radiation. The reason our Ocean Optics spectrometers have a lower wavelength of 190 nm is that almost every material absorbs below this wavelength. That region is known as the “vacuum ultraviolet”. When I was a
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/07/2010 for the course CHEM 257 taught by Professor Asdf during the Spring '10 term at Allan Hancock College.

Page1 / 2

Experiment 6 - Greenhouse Gas and Stratospheric Ozone -...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online