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Section 3 Lecture Notes_May 31

# Section 3 Lecture Notes_May 31 - Chapter 18 Fundamentals of...

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May 31, 2007 Chapter 18 – Fundamentals of Spectrophotometry ___________ Spectrophotometry – any procedure that uses some form of light to measure the concentration of a chemical species. I. Electromagnetic Radiation (light) A. Particle/Wave Duality Wave Theory Particle Theory 1600’s Huygens Wave Interference Newton Reflection Early 1800’s Young & Fresnel : “double slit experiment” · Late 1800’s Maxwell : Light is a propagation of · Early 1900’s Plank & Einstein :

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Plank: Blackbody Radiation Einstein: Photoelectric Effect 1. 2. 3. Energy of the ejected electrons was proportional to the frequency of light (not intensity) … can only be explained by a particle hitting the surface and passing on its energy. B. Wave Properties 2 components: (Shown as “plane polarized” light)
Properties of Light Wavelength ( λ ): crest-to-crest (or trough-to- trough) distance between waves, generally measured in nm Frequency ( ν ): number of complete oscillations the wave makes each second (1/s, s -1 , Hz) νλ = c c speed of light (in vacuum) = 2.998 x 10 8 m/s Units for above equation: (s -1 )(m) = (m/s) C. Light Particle (“Photon”) Properties Photons (h ν ): energetic particles of light E = h ν E = hc/ λ = hc ν h Planck’s constant = 6.626 x 10

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Section 3 Lecture Notes_May 31 - Chapter 18 Fundamentals of...

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