421-821-chapter-6

421-821-chapter-6 - Properties of ElectroMagnetic Radiation...

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Properties of ElectroMagnetic Radiation (Light) Introduction A.) Spectroscopy : A method of analysis based on the interaction, absorption or production of light by matter. (also may include the interaction of electrons, ions or acoustics with matter) B.) Light : Electromagnetic radiation Two different views of light : 1.) Wave Model
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1. Wave Model i.) represented by a sinusoidal wave traveling in space with an oscillating electric field and perpendicular magnetic field. (electric field is what is considered or used in most spectroscopic methods – except NMR) ii.) description of wave model 1) amplitude (A) – height of wave’s electric vector 2) wavelength ( λ ) – distance (nm, cm, m) from peak to peak a) wave number ( 29 = 1/λ (cm -1 ) v
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1. Wave Model ii.) description of wave model 3) frequency ( ν ) – number of cycles or oscillations per second a) hertz (Hz) or s -1 . 4) velocity of propagation (v) – rate of travel through space, dependent on
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2. Particle Model i.) light viewed as discrete particles of energy called photons a) like other particles, light can be scattered, counted (quantized) , etc ii. ) Energy of wave/particle: E = h ν = hc/ λ = hc h = Plank’s constant (6.63 x 10 -34 J . S) ν = frequency, λ = wavelength, =wave number note: energy is proportional to frequency and wave number ( c ν c cE ) energy is inversely proportional to wavelength ( c λ Ε ) E o E 1 h ν Energy required of photon to give this transition: v v
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Wide Range of Types of Electromagnetic Radiation in nature. 1.
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This note was uploaded on 05/09/2010 for the course CHEM 221 taught by Professor Dr.robertpowers during the Fall '07 term at San Diego.

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421-821-chapter-6 - Properties of ElectroMagnetic Radiation...

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