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^{2}P

_{1/2}to 3

^{2}S

_{1/2}transition of the Na atom at 5896 angstrom (one of the Na D lines) is measured to be 16.4 ns.

What are the einstein a and b coeff?

What is the transition moment in debye?

What is the peak absorption cross section for the transition in angstrom

^{2}, assuming that the linewidth is determined by lifetime broadening.

I'm really at a loss where to start here. I know B

_{1<-0}=(2∏

^{2}/3ε

_{o}h

^{2})μ

_{10}

^{2}, where μ is the transition moment. Similarly, I have an equations for A in terms of frequency and μ. How do I solve for μ? What about the last part?