Table 1. Comparison between experiment and a simple theoretical model which is restricted to two particles. Spectral amplitudes are given relative to the Rb D₂ line amplitude.

Density (cm–3)	Ratio (2D2/D2)		Ratio (5d/D2)
	Exp.	Theo.	Exp.	Theo.
7 × 1010	2 × 10–2	2(2) × 10–9	1 × 10–3	2(2) × 10–3
8 × 109	3 × 10–3	3(2) × 10–10	—	—
8 × 106	2 × 10–2	6(12) × 10–13