Chap.12 Part 2- Chap.13 part 1 Lecture NOtes

# Chap.12 Part 2- Chap.13 part 1 Lecture NOtes -...

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Title: Jun 11­10:12 AM (1 of 33)

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Spectroscopy and the Electromagnetic Spectrum Spectroscopy: Characteristics of Electromagnetic Radiation: Wavelength ( ) : Frequency ( ) : Amplitude : Height of a wave (midpoint to maximum) Wavelength x Frequency = Speed c = 3.00 x 108m/s [speed of light] Title: Jul 28 ­ 10:58 AM (2 of 33)
Electromagnetic energy is transmitted in discrete quanta (photons) h = Planck's constant [ 6.62 x 10­34J*s = 1.58 x 10­34cal*s ] Energy value varies directly with frequency, but inversely with wavelength High Energy Radiation: Low Energy Radiation: = amount of energy in one photon (quantum) of a given frequency ( ) Title: Jul 29 ­ 9:56 AM (3 of 33)

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Conversion of to E: E represents the energy of one mole (avagadro's number) of photons of wavelength Exposure of an organic molecule to electromagnetic radiation: Absorption Spectrum: Sample is irradiated with a broad range of wavelengths and the absorptions are recorded Title: Jul 29 ­ 10:02 AM (4 of 33)
The x­axis corresponds to the wavelengths/frequencies of light used to irradiate the sample The y­axis corresponds to the percent transmittance observed Spectra are read top down and a downward spike indicates an energy absorption Energy Absorptions (IR Spectroscopy): Infrared Spectroscopy (IR): Wavelengths within the IR region are given in micrometers [1 μ m = 10­6m] Frequencies are given in wavenumbers instead of hertz Title: Jul 29 ­ 10:10 AM (5 of 33)

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Title: Nov 17 ­ 3:42 PM (6 of 33)
Wave Ya Hands in Da Ayyah Wave Em Like Ya Jus Don't Cayyah Let's Dance!!! These wavelengths correspond to specific energy values that the molecules can either absorb or transmit Title: Nov 17 ­ 3:46 PM (7 of 33)

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Interpreting IR Spectra:
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Chap.12 Part 2- Chap.13 part 1 Lecture NOtes -...

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