Optical constants

Refractive index of CH₃OH (Methanol)

El-Kashef 2000: n 0.4–0.8 µm

Data: formula 5
Range: 0.4–0.8 µm
Temperature: 298 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.33141
Extinction coefficient k: 0

Permittivity ε₁: 1.77266
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: 13.659
Chromatic dispersion dn/dλ: -0.125259 µm⁻¹

Group index n_g: 1.40501
Group velocity dispersion: 229.758 fs²/mm

Dispersion parameter D: -1253.45 ps/(nm·km)
Photon energy: 2.11001 eV

ε = (n + ik)², α = 4πk/λ, n_g = n − λ dn/dλ, GVD = λ³/(2πc²) d²n/dλ², D = −(λ/c) d²n/dλ². Group-velocity dispersion is given for formula data only.

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# CH3OH (Methanol): El-Kashef 2000: n 0.4–0.8 µm
ch3oh = ls.fetch_refractiveindex("organic", "methanol", "El-Kashef", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ch3oh.range_nm)  # (400, 800) nm
eps = ch3oh.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_1afc128db806/lightsmith"
ch3oh = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ch3oh.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (methanol/el-kashef-2000).

# ... load ch3oh as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ch3oh)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=800, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

Dispersion formula

Cauchy (formula 5), λ in µm

n = 1.294611 + 0.012706403 λ^{- 2.0}

Valid from 0.4 to 0.8 µm.

Coefficients as stored

C_i	Value
C1	1.294611
C2	0.012706403
C3	-2.0

Comments and conditions

25 °C

Conditions

temperature: 298 K

References

H. El-Kashef. The necessary requirements imposed on polar dielectric laser dye solvents. Physica B 279, 295-301 (2000)

doi:10.1016/s0921-4526(99)00856-x The necessary requirements imposed on polar dielectric laser dye solvents, Physica B: Condensed Matter (2000)

Cite

Hassan El-Kashef. The necessary requirements imposed on polar dielectric laser dye solvents. Physica B: Condensed Matter, 279, 295-301 (2000), doi:10.1016/s0921-4526(99)00856-x; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

CH3OH (Methanol), El-Kashef 2000: n 0.4–0.8 µm: n and k versus wavelength
λ (µm)	n
0.4	1.374026
0.400695	1.373751
0.401392	1.373476
0.40209	1.373203
0.402789	1.37293
0.40349	1.372658
0.404191	1.372388
0.404894	1.372118
0.405598	1.371849
0.406303	1.371581
0.40701	1.371314
0.407717	1.371048
0.408426	1.370783
0.409136	1.370519
0.409848	1.370256
0.41056	1.369993
0.411274	1.369732
0.411989	1.369471
0.412706	1.369212
0.413423	1.368953
0.414142	1.368695
0.414862	1.368438
0.415583	1.368182
0.416306	1.367927
0.41703	1.367672
0.417755	1.367419
0.418481	1.367167
0.419209	1.366915
0.419938	1.366664
0.420668	1.366414
0.421399	1.366165
0.422132	1.365917
0.422866	1.36567
0.423601	1.365423
0.424338	1.365178
0.425076	1.364933
0.425815	1.364689
0.426555	1.364446
0.427297	1.364204
0.42804	1.363962
0.428784	1.363722
0.429529	1.363482
0.430276	1.363243
0.431024	1.363005
0.431774	1.362768
0.432525	1.362532
0.433277	1.362296
0.43403	1.362061
0.434785	1.361827
0.435541	1.361594
0.436298	1.361362
0.437056	1.36113
0.437816	1.3609
0.438578	1.36067
0.43934	1.360441
0.440104	1.360212
0.440869	1.359985
0.441636	1.359758
0.442404	1.359532
0.443173	1.359307
0.443943	1.359082
0.444715	1.358859
0.445489	1.358636
0.446263	1.358414
0.447039	1.358193
0.447816	1.357972
0.448595	1.357752
0.449375	1.357533
0.450156	1.357315
0.450939	1.357098
0.451723	1.356881
0.452508	1.356665
0.453295	1.35645
0.454083	1.356235
0.454873	1.356021
0.455664	1.355808
0.456456	1.355596
0.45725	1.355385
0.458045	1.355174
0.458841	1.354964
0.459639	1.354755
0.460438	1.354546
0.461239	1.354338
0.462041	1.354131
0.462844	1.353924
0.463649	1.353719
0.464455	1.353514
0.465263	1.353309
0.466072	1.353106
0.466882	1.352903
0.467694	1.352701
0.468507	1.352499
0.469321	1.352299
0.470137	1.352098
0.470955	1.351899
0.471774	1.3517
0.472594	1.351502
0.473416	1.351305
0.474239	1.351108
0.475063	1.350912
0.475889	1.350717
0.476717	1.350523
0.477546	1.350329
0.478376	1.350135
0.479208	1.349943
0.480041	1.349751
0.480876	1.34956
0.481712	1.349369
0.482549	1.349179
0.483388	1.34899
0.484229	1.348801
0.485071	1.348613
0.485914	1.348426
0.486759	1.348239
0.487605	1.348053
0.488453	1.347868
0.489303	1.347683
0.490153	1.347499
0.491006	1.347316
0.491859	1.347133
0.492714	1.346951
0.493571	1.346769
0.494429	1.346588
0.495289	1.346408
0.49615	1.346228
0.497013	1.346049
0.497877	1.345871
0.498743	1.345693
0.49961	1.345516
0.500479	1.345339
0.501349	1.345164
0.50222	1.344988
0.503094	1.344813
0.503968	1.344639
0.504845	1.344466
0.505722	1.344293
0.506602	1.344121
0.507483	1.343949
0.508365	1.343778
0.509249	1.343607
0.510134	1.343437
0.511021	1.343268
0.51191	1.343099
0.5128	1.342931
0.513692	1.342763
0.514585	1.342596
0.515479	1.34243
0.516376	1.342264
0.517274	1.342099
0.518173	1.341934
0.519074	1.34177
0.519976	1.341606
0.52088	1.341443
0.521786	1.341281
0.522693	1.341119
0.523602	1.340958
0.524513	1.340797
0.525425	1.340637
0.526338	1.340477
0.527253	1.340318
0.52817	1.34016
0.529088	1.340002
0.530008	1.339844
0.53093	1.339687
0.531853	1.339531
0.532778	1.339375
0.533704	1.33922
0.534632	1.339065
0.535562	1.338911
0.536493	1.338757
0.537426	1.338604
0.53836	1.338452
0.539296	1.3383
0.540234	1.338148
0.541173	1.337997
0.542114	1.337847
0.543057	1.337697
0.544001	1.337547
0.544947	1.337398
0.545894	1.33725
0.546843	1.337102
0.547794	1.336955
0.548747	1.336808
0.549701	1.336661
0.550657	1.336516
0.551614	1.33637
0.552573	1.336225
0.553534	1.336081
0.554496	1.335937
0.55546	1.335794
0.556426	1.335651
0.557394	1.335509
0.558363	1.335367
0.559334	1.335225
0.560306	1.335085
0.56128	1.334944
0.562256	1.334804
0.563234	1.334665
0.564213	1.334526
0.565194	1.334388
0.566177	1.33425
0.567161	1.334112
0.568148	1.333975
0.569135	1.333839
0.570125	1.333703
0.571116	1.333567
0.572109	1.333432
0.573104	1.333297
0.5741	1.333163
0.575099	1.333029
0.576099	1.332896
0.5771	1.332763
0.578104	1.332631
0.579109	1.332499
0.580116	1.332368
0.581124	1.332237
0.582135	1.332106
0.583147	1.331976
0.584161	1.331847
0.585177	1.331717
0.586194	1.331589
0.587213	1.33146
0.588234	1.331333
0.589257	1.331205
0.590282	1.331078
0.591308	1.330952
0.592336	1.330826
0.593366	1.3307
0.594398	1.330575
0.595431	1.33045
0.596466	1.330326
0.597504	1.330202
0.598542	1.330079
0.599583	1.329956
0.600626	1.329833
0.60167	1.329711
0.602716	1.329589
0.603764	1.329468
0.604814	1.329347
0.605865	1.329226
0.606919	1.329106
0.607974	1.328987
0.609031	1.328868
0.61009	1.328749
0.611151	1.32863
0.612214	1.328512
0.613278	1.328395
0.614344	1.328278
0.615413	1.328161
0.616483	1.328044
0.617554	1.327928
0.618628	1.327813
0.619704	1.327698
0.620781	1.327583
0.621861	1.327469
0.622942	1.327355
0.624025	1.327241
0.62511	1.327128
0.626197	1.327015
0.627286	1.326903
0.628376	1.326791
0.629469	1.326679
0.630563	1.326568
0.63166	1.326457
0.632758	1.326347
0.633858	1.326237
0.63496	1.326127
0.636064	1.326018
0.63717	1.325909
0.638278	1.3258
0.639388	1.325692
0.6405	1.325584
0.641613	1.325477
0.642729	1.32537
0.643847	1.325263
0.644966	1.325157
0.646087	1.325051
0.647211	1.324945
0.648336	1.32484
0.649463	1.324735
0.650593	1.324631
0.651724	1.324526
0.652857	1.324423
0.653992	1.324319
0.655129	1.324216
0.656268	1.324114
0.657409	1.324011
0.658552	1.323909
0.659697	1.323808
0.660844	1.323706
0.661993	1.323605
0.663145	1.323505
0.664298	1.323405
0.665453	1.323305
0.66661	1.323205
0.667769	1.323106
0.66893	1.323007
0.670093	1.322909
0.671258	1.322811
0.672425	1.322713
0.673594	1.322615
0.674765	1.322518
0.675939	1.322421
0.677114	1.322325
0.678291	1.322229
0.679471	1.322133
0.680652	1.322038
0.681835	1.321943
0.683021	1.321848
0.684209	1.321753
0.685398	1.321659
0.68659	1.321565
0.687784	1.321472
0.68898	1.321379
0.690177	1.321286
0.691378	1.321193
0.69258	1.321101
0.693784	1.321009
0.69499	1.320918
0.696199	1.320826
0.697409	1.320735
0.698622	1.320645
0.699836	1.320555
0.701053	1.320465
0.702272	1.320375
0.703493	1.320286
0.704716	1.320197
0.705942	1.320108
0.707169	1.320019
0.708399	1.319931
0.70963	1.319843
0.710864	1.319756
0.7121	1.319669
0.713338	1.319582
0.714579	1.319495
0.715821	1.319409
0.717066	1.319323
0.718312	1.319237
0.719561	1.319152
0.720813	1.319067
0.722066	1.318982
0.723321	1.318897
0.724579	1.318813
0.725839	1.318729
0.727101	1.318645
0.728365	1.318562
0.729631	1.318479
0.7309	1.318396
0.732171	1.318314
0.733444	1.318231
0.734719	1.31815
0.735997	1.318068
0.737276	1.317987
0.738558	1.317905
0.739842	1.317825
0.741129	1.317744
0.742417	1.317664
0.743708	1.317584
0.745001	1.317504
0.746297	1.317425
0.747594	1.317346
0.748894	1.317267
0.750196	1.317188
0.751501	1.31711
0.752807	1.317032
0.754116	1.316954
0.755427	1.316877
0.756741	1.3168
0.758057	1.316723
0.759375	1.316646
0.760695	1.316569
0.762018	1.316493
0.763343	1.316417
0.76467	1.316342
0.765999	1.316266
0.767331	1.316191
0.768665	1.316116
0.770002	1.316042
0.771341	1.315967
0.772682	1.315893
0.774025	1.31582
0.775371	1.315746
0.776719	1.315673
0.77807	1.3156
0.779423	1.315527
0.780778	1.315454
0.782135	1.315382
0.783495	1.31531
0.784858	1.315238
0.786222	1.315167
0.787589	1.315095
0.788959	1.315024
0.790331	1.314954
0.791705	1.314883
0.793081	1.314813
0.79446	1.314743
0.795842	1.314673
0.797225	1.314603
0.798611	1.314534
0.8	1.314465

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

CH₃OH (Methanol): all datasets

About CH3OH (Methanol)

Methanol (CH₄O), also known as wood alcohol, is a clear, colorless liquid with a slightly sweet odor. It is the simplest alcohol and is used as an antifreeze, solvent, fuel, and as a feedstock for producing various chemicals. Methanol is flammable and is toxic when ingested, inhaled, or absorbed through the skin. It can cause blindness if ingested. In the field of optics, methanol is often utilized as a solvent in various spectroscopic studies due to its ability to dissolve a wide range of organic compounds. Chemical formula: CH₃OH or MeOH

More about CH3OH (Methanol) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/CH4O - methanol/nk/El-Kashef.yml
ID: ds_1afc128db806
API: /v1/datasets/ds_1afc128db806

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