can we build individual molecules atom by atom? lecture 2
TRANSCRIPT
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Can we build individual molecules atom by atom?
Lecture 2
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Yesterday we
• Talked about two-level atoms in light• Optical trapping of atoms• Laser cooling of atoms• Dave explained how to cool all the way to the
ground state (Same thing works for a single neutral atom in an optical micro-trap)
• Found that the students do not participate much in the lectures
• This provide the initialisation step of our atoms.
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What is the difference between molecular physics and chemistry?
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Basic molecular physics
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The Hamiltonian
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Nuclear equation
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Separate S. E. Equations
Nuclear motion:
Electrons. For all R solve:
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Basic molecular physics
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We start from
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A bit of algebra
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We arrive at
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Two conclusions
• Di-atomic molecules are indeed “physics”
• But the physics is very rich
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Dipole operator for molecule
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Selection rules for transitions that do not change electronic state:
• Hetero nuclear:
• Homo nuclear: No allowed transitions
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Franck-Condon PrincipleDifferent electronic states
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