The Doppler effect is one of the sources of the line broadening in atomic
Chapter 8, Problem 8-8(choose chapter or problem)
The Doppler effect is one of the sources of the line broadening in atomic absorptionspectroscopy. Atoms moving toward the light source encounter higherfrequencyradiation than atoms moving away from the source. The differencein wavelength .lA experienced by an atom moving at speed v (compared to oneat rest) is .lAf A = vie, wherc c is the velocity of light. Estimate the line width (innanometers) of the lithium line at 670.776 (6707.76 A) when the absorbing atomsare at a temperature of (a) 2100 K and (b) 3150 K. The average speed of an atomis given by v = V8kTlrrm, where k is Boltzmann's constant, Tis the absolutetemperature, and m is its mass.
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