Questions on Laser Spectroscopy

1. Detail the type of energy level transition corresponding to absorption or emission of different types of EM radiation, including x-ray, microwave, UV, visible and IR.  Rank order these in increasing energy.
2. What is an absorption spectrum and how is it obtained?
3. What does fingerprinting mean in IR spectroscopy?
4. Why can't water be used as a solvent in doing IR absorption spectroscopy?
5. Why does UV absorption in a DNA solution increase as its temperature is increased?
6. Why is the sky blue?
7. Why is the sky over Schenectady usually grey?
8. Why are sunsets and sunrises brightest when there is lots of water moisture in the air?