Ch1b09Lecture04

Ch1b09Lecture04 - Jim Heath 16 Noyes [email protected] 1 A...

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1 Jim Heath 16 Noyes [email protected]
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2 A few comments: 1. You won’t have to memorize much, if anything (this is not biology) 2. If you do your work, pass the big exams, and if your application to Caltech was legitimate, then you will pass 3. Lecture notes are VERY important!! For part 1 of this course, the powerpoint presentations of the lectures will be posted after each class (in pdf form). I may also occasionally post written lecture notes that should help focus your studying. OGN is a big, amorphous book – it has good problem sets, but it covers too much material. 4. I will highlight many of our lectures by placing them into the context of real science that is being done at Caltech and elsewhere. I will cover what is important about these chemistry in context examples, and you will be asked about them regularly on quizzes.
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3 Please ask questions!!! Stop me and raise your hand if you don’t understand something. If you have a question, chances are about 30-80% of the people in the room have the same question. The ones who fully understand this material are not present in this room because they are not taking this course.
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4 Leonardo Da Vinci Prof Heath - Why do you think that the students don’t ask questions? Hmmm, Leo. Perhaps they are a little bit embarrassed to speak up? They don’t want to look lost in the presence of so many bright Caltech classmates?
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5 Leonardo Da Vinci Well probably they also are just polite and don’t want to rudely to interrupt you? A possibility, Leo. However, interrupting me with questions is ALWAYS ok.
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6 Fri & next week Today & tomorrow & Thursday Also, Mass spectrometry next week
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7 Spectroscopy Units wavenumbers cm -1 A wavenumber is simply 1/ λ , with λ in cm’s. Recall that Energy = E = h ν = hc/ λ , so 1/ λ (= cm -1 ) is an energy ν , or frequency (cycles per second) is also an energy c 3.0×10 10 cm·s -1 = 3.0e10 cm·s -1 = speed of light in vacuum h = 6.626e-34 J·s (kg m 2 s -1 ) = Planck’s constant B E Light is electromagnetic radiation λ time (wavelength)
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8 Spectroscopy Units wavenumbers cm -1 A wavenumber is simply 1/ λ , with λ in cm’s. Recall that E = h ν = hc/ λ , so 1/ λ (= cm -1 ) is an energy ν , or frequency (cycles per second) is an energy Also, electron volts eV 1 eV 8000 cm -1 = 1.6e-19 J 1 eV is the kinetic energy an electron has after being accelerated through a 1 volt electric field Visible light 13000 – 25000 cm -1 1.5 – 3 eV eV’s are a manageable unit for describing visible & UV light and hence chemical bond energies c 3.0×10 10 cm·s -1 = 3.0e10 cm·s -1 = speed of light in vacuum h = 6.626e-34 J·s (kg m 2 s -1 ) = Planck’s constant
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9 The photon absorption or photon emission spectrum of a molecule is discreet, or quantized True for NMR, rotational spectroscopy, infrared spectroscopy, and electronic spectroscopy Absorbance or emission λ , cm -1 , s -1 , or eV’s WHY?
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This note was uploaded on 09/25/2010 for the course CH 104 taught by Professor Bopanna during the Fall '09 term at UMBC.

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Ch1b09Lecture04 - Jim Heath 16 Noyes [email protected] 1 A...

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