The helium-neon laser is famous for its red-light emission at 632.8 nm. But electrons in that same high-energy level can jump down to nine other lower levels (each with appreciable probabilities), emitting radiant energy at wavelengths shown in Table 13.3. Determine the lifetime of that upper energy level. Which transition is most likely to take place? Which should be the brightest visible emission?

Table 13.3

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A (nm) Aji (s-1) 259 × 10 60.0 283 × 10° 543.4 2.00 X 10 593.9 2.26 × 10° 604.6 6.09 × 10 611.8 6.39 × 10° 629.4 33.9 × 10 632.8 3.45 × 10 635.2 13.9 × 10 640.1 2.55 × 10° 730.5