Refractive index of PdSe2 (Palladium diselenide)

import lightsmith as ls

# PdSe2 (Palladium diselenide): Ermolaev et al. 2022: 4.5 nm film; n,k 0.200–10.0 µm
pdse2 = ls.fetch_refractiveindex("main", "PdSe2", "Ermolaev", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(pdse2.range_nm)  # (200, 10000) nm
eps = pdse2.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_eb82beb6483e/lightsmith"
pdse2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(pdse2.source)  # citation and provenance travel with the data

# ... load pdse2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=pdse2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength