Refractive index of Ag (Silver)

import lightsmith as ls

# Ag (Silver): Windt et al. 1988: n,k 0.0024–0.122 µm
ag = ls.fetch_refractiveindex("main", "Ag", "Windt", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ag.range_nm)  # (2.36, 121.57) nm
eps = ag.eps([16.9])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_eae3ced5e7d7/lightsmith"
ag = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ag.source)  # citation and provenance travel with the data

# ... load ag as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ag)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=3, stop_nm=121, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength