Refractive index of C₈H₁₈ (Octane)

import lightsmith as ls

# C8H18 (Octane): Myers et al. 2018: n-Octane; n,k 1.28–25.0 µm
c8h18 = ls.fetch_refractiveindex("organic", "octane", "Myers", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c8h18.range_nm)  # (1282.46, 25019.4) nm
eps = c8h18.eps([5660])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_b18f0de36f97/lightsmith"
c8h18 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c8h18.source)  # citation and provenance travel with the data

# ... load c8h18 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c8h18)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=1283, stop_nm=25020, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength