Refractive index of C₃H₉O₃P (Dimethyl methylphosphonate, DMMP)

import lightsmith as ls

# C3H9O3P (Dimethyl methylphosphonate, DMMP): Myers et al. 2018: n,k 1.28–25.0 µm
c3h9o3p = ls.fetch_refractiveindex("organic", "dimethyl_methylphosphonate", "Myers", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c3h9o3p.range_nm)  # (1282.21, 25022.4) nm
eps = c3h9o3p.eps([5660])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_6dbcc8f022ea/lightsmith"
c3h9o3p = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c3h9o3p.source)  # citation and provenance travel with the data

# ... load c3h9o3p as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c3h9o3p)],
    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