110401 - Spectroscopy: fundamentals and micro-wave (Chapter...

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1 CHM3400 - Lecture 32 Apr 1 Spectroscopy: fundamentals and micro-wave (Chapter 14 513-526) Line width Selection rules Microwave spectroscopy
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2 Electromagnetic radiation and spectroscopy What equations are used to convert between different units?
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3 Natural line width Note that the lifetime of the excited state is shorter, and hence the main contribution to the natural linewidth comes from the lifetime of the excited state. Heisenberg’s Uncertainty Principle π 4 h t E Δ Δ E = h ν⇒Δ E = h Δν t Δ Δ ν 4 1 Unknown in frequency = bandwidth Lifetime
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4 Doppler effect ± = c v 1 0 ν Doppler shifted frequency Frequency of the emitting molecule Velocity of the molecule towards the detector Speed of light Pressure broadening Collisional broadening
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5 Selection rules Spin -forbidden and symmetry -forbidden transitions Does not mean that transition does not occur at all, but rather that the probability of transition is low Ground state
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This note was uploaded on 05/29/2011 for the course CHM 3400 taught by Professor Seabra during the Spring '08 term at University of Florida.

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110401 - Spectroscopy: fundamentals and micro-wave (Chapter...

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