215-216 HH W10-spectroscopy

215-216 HH W10-spectroscopy - 215-216 HH W10 Notes - Dr....

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215-216 HH W10 Notes - Dr. Masato Koreeda Date: January 6, 2010 Topic : _Spectroscopy _ page 1 of 2. Spectroscopy Δ E excited state ground state excitation by the absorption of the light that matches the energy difference ( i.e ., Δ E) Two features: 1). This excitation takes place only when the right energy is supplied – “discrete” or “non-continuous” 2). Not all excitations between the two energy levels are allowed – “selection rules” Δ E = h ν h = Planck’s constant (6.624 x 10 -27 erg•s); ν = frequency of the light required for the excitation (Hz or cycles/s) Since ν = c/ λ where c = the velocity of the light (constant; 2.998 x 10 10 cm/s and λ = the wavelength (cm) of the light used, Δ E = h ν can also be expressed as Δ E = h c/ λ (note that both h and c are constant numbers). The Electromagnetic Spectrum and Absorption Spectroscopy frequency spectral region (Hz or wavelength energy molecular energy information cycles/s) (cm) (Kcal/mol) ______________________obtainable_______ x-rays
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This note was uploaded on 02/24/2010 for the course CHEM 215 taught by Professor Koreeda during the Winter '07 term at University of Michigan.

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215-216 HH W10-spectroscopy - 215-216 HH W10 Notes - Dr....

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