Refractive index of TlBr-TlCl (Thallium bromo-chloride, KRS-6)

import lightsmith as ls

# TlBr-TlCl (Thallium bromo-chloride, KRS-6): Hettner and Leisegang 1948: n 0.6–24 µm
tlbr_tlcl = ls.fetch_refractiveindex("other", "TlBr-TlCl", "Hettner", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(tlbr_tlcl.range_nm)  # (600, 24000) nm
eps = tlbr_tlcl.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_daae50a99e67/lightsmith"
tlbr_tlcl = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(tlbr_tlcl.source)  # citation and provenance travel with the data

# ... load tlbr_tlcl as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=tlbr_tlcl)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=600, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength