A continuum source, gas cell, dispersing prism and detector strip form a spectroscopy bench. In absorption mode the cell removes light near a selected line. In emission mode excited gas produces a line.
• A continuum lamp, gas cell, dispersing element, spectrum detector and a tunable wavelength probe. • Controls for the gas experiment, line-center reference, probe wavelength (nm), Lorentzian HWHM (nm), peak optical depth and packet playback speed. • Four tabs: Quantum bench, Probabilities & measurements, Experiments (with built-in model checks), and Learn & assess.
L(λ) = 1/[1 + ((λ−λ0)/γ)²], where γ is the half-width at half-maximum. Absorption: I/I0 = exp[−τ0 L(λ)]. Emission: normalized line intensity = L(λ). Photon energy E = 1239.841984/λ eV, and approximate line centers follow a simple hydrogen level-energy model.
This is a phenomenological isolated Lorentzian line; the width and optical depth are teaching controls, not a thermal or density plasma prediction. Hydrogen centers are approximate principal-level values, not resolved fine-structure data. Re-emission directions, population kinetics and prism dispersion are not modeled.
No. The line profile makes attenuation wavelength dependent.
No. Width is an independent teaching control; broadening mechanisms are not solved.
On resonance, transmission falls close to exp(−3) for a peak optical depth of 3; off resonance, transmission is near unity away from the line.
In emission mode an excited gas line appears without a continuum lamp, with a normalized intensity equal to the Lorentzian profile L(λ).