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COSMOS UCI, summer 2008 Welkom to COSMOS! The World of Molecules Chemistry at the Nano-scale.
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Transcript of COSMOS UCI, summer 2008 Welkom to COSMOS! The World of Molecules Chemistry at the Nano-scale.
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COSMOS UCI, summer 2008
Welkom to COSMOS!
The World of MoleculesChemistry at the Nano-scale
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Structure
7- 8:30
9:00- 10:15
10:30- 11:15
1:15- 2:30
3:00- 5:00
5:00- 6:30
hour Monday Tuesday Wednesday Thursday Friday Saturday Sunday
breakfast breakfast breakfast breakfast breakfast
Lecture 1
Lecture 2
Lecture 1 Lecture 1
Lecture 2 Lecture 2
Lab/field Lab/field
Lab/field Lab/field
Sci. Comm Sci. Comm Sci. Comm
Special Special Special
Project Project
lunch lunch lunch lunch lunch
dinner dinner dinner dinner dinner
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groups
Group 1 Group 2 Group 3
John Chu Kathleen Kang Eugene PynkoTatyana Dynikova Steven Kezian Adarsh Ramakrishnan Seo-Im Hong Darren Pan Jennifer Stukenberg Jiwoo Jeon Megan Stone Diane Tran
Group 4 Group 5Eugene Shin Justin WangMichael Vorobyov Yutong WuKimberly Vu Ringo YenElizabeth Wille
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Instructors
Prof. Nien-Hui Ge
When Atoms Meet
Understanding the Covalent Bond
Bonding in Solids
2D IR spectroscopy
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Instructors
Prof. Ara Apkarian Ultrafast Molecular Spectroscopy
LasersPulses of LightFast Photography
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Instructors
Prof. Wilson Ho Scanning Tunneling Microscopy
Lasers and Microscopes
Seeing Single Molecules
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Instructors
Prof. Phillip Collins Nanoscopic Devices
Access to the Nanoworld
More than One, less than a Mole
Nanoscience vs. Nanotechnology
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Lab sessions
Shawn Perdue
Lab 2: The Nature of Light
Min Kim
Lab 1: Infrared Fourier Transform Spectroscopy
Max Zimmerley
Lab 3: Two-photon Microscopic Imaging
Danny Wan
Lab 4: Imaging at the Nanoscale
Wendong Xing
Lab 5: Millikan Oil Drop Experiment
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What is matter?
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Zooming in
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Zooming in
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Zooming in
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Zooming in
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The world is made of molecules
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Molecules are made of atoms
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Atom
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Atoms are real
Sodium chloride crystal lattice
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Atoms are small
10 million times
0.5 mm (5 x 10-4 m) ~ 1/50 ” 50 pm (5 x 10-11 m)
13 x 105 m ~ 8 x 103 mi
10 million times
~10 cm
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Atoms have tiny masses
Proton (charge 1+): mp = 1.672 x 10-27 kg
Neutron (charge 0): mn = 1.674 x 10-27 kg
Electron (charge 1-): me = 9.109 x 10-31 kg
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Why the Atom stays together
r+-
Coulomb potential
€
F = −dV (r)
drThere is an attractive force between the electron and the nucleus
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The World of Atoms
Atoms are extremely small
Protons, neutrons and electrons are extremely light
Electrons are confined to the vicinity of the nucleus
How do electrons move around the atom?
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What Newton predicts
Sir Isaac Newton (1642-1727)
Motion of object can be precisely calculated from a set of observables:
x - position of object
v - velocity of object
E - energy of object
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What Schrödinger says
Erwin Schrödinger (1887-1961)
Position, v and E of very small object can not have any random value.
Small particles behave like waves!
Observables have only certain discrete values
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Who’s right?
White light passing through a prism produces a continuous spectrum.
Hydrogen gas exposed to an electric discharge gives a line spectrum.
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Who’s right?
Electrons are particles with a rest mass of me = 9.109 x 10-31 kg
Do they also behave like waves?
Looks like the pattern that a wave would make!
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Who’s right?
Electrons confined to a circular well
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Schrödinger wins first prize!
Schrödinger
The world of atoms is described through Quantum Mechanics
Electrons, protons, atoms have wave-like properties
Newton: 2nd prize
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Math tools
Newton:
Quantum:
€
f (r, t) v, E etc.x
€
Ψ(r, t) x, v, E etc.
€
−h2
2m
d2
dx 2Ψ(r, t) = EΨ(r, t)
The shape of the wavefunction can be obtained from the Schrödinger equation:
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Wave properties
The electron bound to the atom looks like a standing wave.
r
-+