Table 1.

Slopes of the fitted data, experimental and simulated, as shown in Figure 3. The upper row takes both fluorescence regions, L_α and L_β, into account. The lower one only L_α. By inserting the value of A in Equation (1), it is possible to extrapolate detectable gold masses per incident photon number.

Slope, A	0° sim	30° sim	60° sim	90° sim	30° exp
Global [σ/pg/$\sqrt{I_{eff}}$]	1.92·10−7	2.18·10−7	3.92·10−7	1.06·10−6	1.95·10−7
Lα [σ/pg/$\sqrt{I_{eff}}$]	1.12·10−7	1.35·10−7	2.53·10−7	6.39·10−7	1.46·10−7