Ch1b2010_MidtermReview

Ch1b2010_MidtermReview - 1 Also Mass spectrometry 2 = o...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Also, Mass spectrometry 2 λ = λ o λ = λ o /2 λ = λ o /3 Fig. 4. Same as Fig. 2, but we have noted the relationship between the various harmonics and the fundamental frequency. L λ = 2L = λ λ = L = λ /2 λ = 2L/3 = λ /3 Energy The energy Levels of a particle in a box E = 4h 2 /(8m e L 2 ) E = 9h 2 /(8m e L 2 ) E = h 2 /(8m e L 2 ) n=1 n=2 n=3 Energy Level n = quantum number Each energy level is a wavefunction Ψ n The deBroglie Relationship λ = h/mv 3 Potential Energy and Ψ n and E n r (= length) Potential Energy A realistic potential well (2 atoms connected by a spring) L (= length) Potential Energy ∞ ∞ An unrealistic potential well (i.e. Potential Energy goes to infinity at edges (particle in a box) What is Common to the Unrealistic and Realistic Potential Energy Wells • One degree of freedom = one quantum number (n) • Confining a particle within a ‘potential’ directly leads to quantized energy levels (from deBroglie hypothesis) • Wavefunctions are wave-like (i.e. sinusoidal-type functions) 4 Spectroscopy 5 Electronic Spectroscopy Information about the molecular orbitals Electrons move from one electronic configuration to another Visible/ultraviolet 1000 to 100 nanometers Molecular vibrational spectroscopy Information about the functional groups present on a molecule, the symmetry of the molecule, the structure of the molecule Molecules vibrate (Figure 2) Infrared 1.– 40 micrometers 1 micrometer = 10-6 meters Molecular rotation spectroscopy Information about dipole moments and bond lengths and angles. Molecules rotate (Figure 1) Microwaves Millimeter wavelengths Nuclear magnetic resonance (NMR) Information about local chemical environments as well as global structure Nuclear spins flip from up to down, or from down to up Radiowaves 1.meter and longer wavelengths Spectroscopy Name Molecular Interaction Wavelength of Light Electronic Spectroscopy Information about the molecular orbitals Electrons move from one electronic configuration to another Visible/ultraviolet 1000 to 100 nanometers Molecular vibrational spectroscopy Information about the functional groups present on a molecule,...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern