lecture13 (10-30-2006) Ch 8

lecture13 (10-30-2006) Ch 8 - Chemistry 2A-c F2006...

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1 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch8 (Ch8 -1)97 1)97 Electrons and Atoms Electrons and Atoms At the end of the 19 th century: Classical Physics , such as Newtonian Mechanics, cannot explain phenomena at the atomic and molecular levels – called for the development of Quantum Theory I. Electromagnetic Radiation (plane polarized) wavelength E field H field
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2 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch8 (Ch8 -2)98 2)98 Light is a form of electromagnetic radiation Oscillating electric and magnetic fields perpendicular to direction of travel ) ( 2 sin t x E E m ν λ π = ) ( 2 sin t x H H m = E field perpendicular to H field
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3 Oscillating (Electric or magnetic) Vector Direction of travel Two independent variables Time (t) and Distance (x) ) ( 2 sin t x E E m ν λ π = Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch8 (Ch8 -3)99 3)99 E m -E m
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4 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch8 (Ch8 -9)100 9)100 FREQUENCY AND WAVELENGTH RELATED λ wavelength this is “lamda” ν this is “nu” This is “nu” not “vee” frequency To the speed of electromagnetic radiation (c) λν = c (speed of light) c is the speed of light = constant= 2.997958 x 10 8 m/s Units for : 1 Å (Ångstrom) =10 -8 cm; 1 nm= 10 Å
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5 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch8 (Ch8 -13)101 13)101 ELECTROMAGNETIC SPECTRUM INCREASING FREQUENCY λ
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lecture13 (10-30-2006) Ch 8 - Chemistry 2A-c F2006...

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