Refractive index of C₇H₁₇O3P (Diisopropyl methylphosphonate, DIMP)

import lightsmith as ls

# C7H17O3P (Diisopropyl methylphosphonate, DIMP): Querry 1987: Near-infrared; n,k 0.81–2.5 µm
c7h17o3p = ls.fetch_refractiveindex("organic", "diisopropyl_methylphosphonate", "Querry-NIR", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c7h17o3p.range_nm)  # (814, 2499) nm
eps = c7h17o3p.eps([1430])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_cb2b0aaf379f/lightsmith"
c7h17o3p = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c7h17o3p.source)  # citation and provenance travel with the data

# ... load c7h17o3p as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c7h17o3p)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=814, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength