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The
temperature of the sample greatly affects any kind of spectrum. Changing
average energy of the gas must change the . With knowledge of the
line intensity only; the rotational constant of the molecule can be
calculated.
Launch Applet 3 to bring up the simulation for this section.
Q5.1 Why are more spectral lines visible at higher temperatures?
Q5.2 How would you expect the intensity of the first Anti-Stokes line
to vary with temperature?
Q5.3 How does the intensity of the first Stokes line vary with temperature?
Why is this the case?
Q5.4 From the applet, note the value of J at which line intensity
is a maximum for ten different temperatures.
Q5.5 Why are the maximum intensities at higher temperatures more intense
than at lower temperatures? |