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Homework Help: Uncertainty relationship for rotational spectroscopy

  1. Nov 13, 2009 #1
    From uncertainty relationship ∆E τ ~ hbar, what is the lifetime for a state that gives rise to a line of width 0.1 cm^-1? what about for 100 MHz?

    How do you get the energy term? I'm really not sure how to do this, would appreciate some insight, thnx.
  2. jcsd
  3. Nov 13, 2009 #2


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    Reciprocal centimeters are a measure of what?
  4. Nov 13, 2009 #3
    So it's the wavenumber...

    1) I just use E=hc*(wavenumber), and here E = ∆E?

    2) What about for MHz = s^-1 = f
    So I just use E = hf?

    Or would it be angular frequency and should I use instead E = hbar omega ?
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