Lab 10 – Electronic Energy Levels – Chemistry B1A/Summer 2015 – by Kenward Vaughan and William Daniel Much of what we know about the universe beyond o...
Lab 10 – Electronic Energy Levels – Chemistry B1A/Summer 2015 – by Kenward Vaughan and William Daniel Much of what we know about the universe beyond our planet Earth is a result of our understanding of how light, or electromagnetic radiation, interacts with ordinary matter. This study is called spectroscopy. The absorption or emission of light involves a change of energy in matter, and this change of energy involves different wavelengths or different frequencies of light. The different energies give information about the electronic energy levels of electrons in atoms, and changes in vibrational/rotational energies of molecules provides information about bond strengths, bond lengths, and angles. The intensity of light absorbed or emitted gives information about how much of a substance is present. Radio Waves
Microwaves
Frequency/Hz Wavelength
10 -10 8 10 -1 m
10 - 10 -3 1-10 m cm to mm
10 -10 -3 -6 10 – 10 mm to µm
10 700 – 420 nm
10 -10 420 – 10 nm
Energy Transition in matter Information Provided
Nuclear Magnetismproton spin Molecular Structure
Rotation of molecules
Vibration of molecules
Molecular Structure
Molecular Structure, Compound identification
Electron Energy Levels Electron structure
Electron Energy Levels Electron Structure
0
8
8
Infrared 11
11
Visible
13
14
Ultraviolet 14
16
X-Rays 16
19
10 -10 -9 10 – -11 10 m nm - pm Electron Energy Levels Electron and Nuclear Structure
