LightCell SUPERHEAVY — emission partition

Operating point

NaCl loading → n_Na

free-Na density (m⁻³), log scale. From Cantera speciation.

gas temperature

kinetic T (K), methalox flame. Decoupled from excitation T.

dome radius R

path length (m), log. Sets 589 optical depth → imprisonment.

Chemiluminescent pump measured

3p yield

frac of Na pumped to 3p by bond energy. Rate-matrix output (task #50).

3d direct yield

frac pumped directly to 3d (819 upper).

ionization frac

chemi-ionization → drives free-bound/free-free continuum.

Na₂ band frac

≈0 at flame T (Cantera: Na₂ ~2e-8). Tunable for cool zones.

soot continuum

incandescent-soot graybody loading. The broadband Na-D competes against. Drives selectivity hard — at fuel-rich loading the fireball is mostly continuum.

Spectral partition of radiated power

589 nm (3p→3s, trapped reservoir) 819 nm (3d→3p, escapes) other lines + Na₂ continuum (fb+ff)

in-band fraction (589+819) = device selectivity figure of merit

emergent spectrum — 589 self-reversal depth ∝ optical depth; 819 rides on top