Spectroscopy Copyright © Houghton Mifflin Company. All rights reserved.

(wavelength) x (frequency) = speed [m/s] λν = c [3x108 m/s]

E = h ν

Visible light from the sun ~ 450-750 nm Take 500 nm electronic state

WHAT MAKES A MOLECULE ABSORB LIGHT? When should you push? AT THE RESONANT FREQUENCY

AT THE RESONANT FREQUENCY λν=c

AT THE RESONANT FREQUENCY λν=c VIBRATING DIPOLES!

λ ν Electromagnetic spectrum Copyright © Houghton Mifflin Company. All rights reserved.

E = h ν

The molecular structure of beta-carotene

E = h  = c/ E = hc/