Round 11: Tossup 15

The rate of this process increases in a resonant cavity in the Purcell effect. In three-level systems, a form of this process drops atoms from the metastable energy state E2 to E1. (15[1])The probabilities of two types of this process are described by the (15[1])Einstein A21 and B21 (15[1])coefficients. (15[1])Gain media like rubies facilitate (15[1])one form of this process, which exceeds the rate of (*) absorption in systems (10[1])displaying population inversion. This process’s “spontaneous” form occurs naturally as an excited atom (10[1])drops to a lower (-5[1])energy state, but its “stimulated” form occurs in a chain reaction in barcode scanners. For 10 points, lasers are named for performing what process of releasing light? ■END■ (0[1])

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