Assertion: population's level | /r/HasProperty | n 2
Facets:
Source sentences:
text: If the lifetime of this transition, τ 21 is much longer than the lifetime of the radiationless 3 → 2 transition τ 32 (if τ 21 ≫ τ 32 , known as a favourable lifetime ratio), the population of the E 3 will be essentially zero (N 3 ≈ 0) and a population of excited state atoms will accumulate in level 2 (N 2 > 0).