Optical constants

Refractive index of CH₃OH (Methanol)

Kozma et al. 2005: n 0.230–0.641 µm

Data: formula 5
Range: 0.23–0.6407 µm
Temperature: 295 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.32812
Extinction coefficient k: 0

Permittivity ε₁: 1.76391
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.028802 µm⁻¹

Group index n_g: 1.34505
Group velocity dispersion: 52.0355 fs²/mm

Dispersion parameter D: -283.881 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): Kozma et al. 2005: n 0.230–0.641 µm
ch3oh = ls.fetch_refractiveindex("organic", "methanol", "Kozma", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ch3oh.range_nm)  # (230, 640.7) 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_813121c440c2/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/kozma-2005).

# ... 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=640, 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 = 1.3195 + 0.00305364419 λ^{- 2.0} - 3.41636393011 \times 10^{-5} λ^{- 4.0} + 2.62128 \times 10^{-6} λ^{- 6.0}

Valid from 0.23 to 0.6407 µm.

Coefficients as stored

C_i	Value
C1	1.3195
C2	0.00305364419
C3	-2.0
C4	-3.41636393011e-05
C5	-4.0
C6	2.62128e-06
C7	-6.0

Comments and conditions

22 °C

Conditions

temperature: 295 K

References

I. Z. Kozma, P. Krok, and E. Riedle. Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet. J. Opt. Soc. Am. B 22, 1479-1485 (2005)

doi:10.1364/josab.22.001479 Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet, Journal of the Optical Society of America B (2005)

Cite

Ida Z. Kozma, Patrizia Krok and Eberhard Riedle. Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet. Journal of the Optical Society of America B, 22, 1479 (2005), doi:10.1364/josab.22.001479; 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), Kozma et al. 2005: n 0.230–0.641 µm: n and k versus wavelength
λ (µm)	n
0.23	1.382724
0.230591	1.382282
0.231184	1.381845
0.231779	1.381412
0.232374	1.380983
0.232972	1.380559
0.233571	1.380138
0.234171	1.379722
0.234773	1.37931
0.235377	1.378902
0.235982	1.378498
0.236589	1.378097
0.237197	1.377701
0.237807	1.377308
0.238418	1.376919
0.239031	1.376534
0.239646	1.376152
0.240262	1.375774
0.240879	1.375399
0.241499	1.375028
0.24212	1.374661
0.242742	1.374297
0.243366	1.373936
0.243992	1.373578
0.244619	1.373224
0.245248	1.372873
0.245879	1.372526
0.246511	1.372181
0.247144	1.37184
0.24778	1.371501
0.248417	1.371166
0.249055	1.370834
0.249696	1.370504
0.250338	1.370178
0.250981	1.369854
0.251627	1.369534
0.252273	1.369216
0.252922	1.368901
0.253572	1.368589
0.254224	1.368279
0.254878	1.367972
0.255533	1.367668
0.25619	1.367366
0.256849	1.367067
0.257509	1.366771
0.258171	1.366477
0.258835	1.366186
0.2595	1.365897
0.260167	1.36561
0.260836	1.365326
0.261507	1.365044
0.262179	1.364765
0.262853	1.364488
0.263529	1.364213
0.264207	1.363941
0.264886	1.36367
0.265567	1.363402
0.26625	1.363136
0.266934	1.362873
0.26762	1.362611
0.268308	1.362352
0.268998	1.362095
0.26969	1.361839
0.270383	1.361586
0.271078	1.361335
0.271775	1.361086
0.272474	1.360838
0.273174	1.360593
0.273877	1.36035
0.274581	1.360108
0.275287	1.359869
0.275994	1.359631
0.276704	1.359395
0.277415	1.359161
0.278129	1.358929
0.278844	1.358699
0.279561	1.35847
0.280279	1.358243
0.281	1.358018
0.281722	1.357794
0.282447	1.357573
0.283173	1.357352
0.283901	1.357134
0.284631	1.356917
0.285362	1.356702
0.286096	1.356488
0.286832	1.356276
0.287569	1.356066
0.288308	1.355857
0.289049	1.355649
0.289793	1.355443
0.290538	1.355239
0.291285	1.355036
0.292033	1.354835
0.292784	1.354635
0.293537	1.354436
0.294292	1.354239
0.295048	1.354043
0.295807	1.353849
0.296567	1.353656
0.29733	1.353464
0.298094	1.353274
0.298861	1.353085
0.299629	1.352897
0.300399	1.352711
0.301171	1.352526
0.301946	1.352342
0.302722	1.35216
0.3035	1.351979
0.304281	1.351799
0.305063	1.35162
0.305847	1.351443
0.306633	1.351266
0.307422	1.351091
0.308212	1.350917
0.309005	1.350745
0.309799	1.350573
0.310595	1.350403
0.311394	1.350233
0.312195	1.350065
0.312997	1.349898
0.313802	1.349732
0.314609	1.349568
0.315417	1.349404
0.316228	1.349241
0.317041	1.34908
0.317856	1.348919
0.318674	1.34876
0.319493	1.348601
0.320314	1.348444
0.321138	1.348287
0.321963	1.348132
0.322791	1.347978
0.323621	1.347824
0.324453	1.347672
0.325287	1.34752
0.326124	1.34737
0.326962	1.34722
0.327803	1.347072
0.328645	1.346924
0.32949	1.346778
0.330337	1.346632
0.331187	1.346487
0.332038	1.346343
0.332892	1.3462
0.333748	1.346058
0.334606	1.345917
0.335466	1.345776
0.336328	1.345637
0.337193	1.345498
0.33806	1.34536
0.338929	1.345223
0.3398	1.345087
0.340674	1.344952
0.34155	1.344817
0.342428	1.344683
0.343308	1.344551
0.344191	1.344419
0.345076	1.344287
0.345963	1.344157
0.346852	1.344027
0.347744	1.343898
0.348638	1.34377
0.349534	1.343643
0.350433	1.343516
0.351334	1.34339
0.352237	1.343265
0.353143	1.343141
0.354051	1.343017
0.354961	1.342894
0.355874	1.342772
0.356788	1.342651
0.357706	1.34253
0.358625	1.34241
0.359547	1.34229
0.360472	1.342172
0.361398	1.342054
0.362328	1.341937
0.363259	1.34182
0.364193	1.341704
0.365129	1.341589
0.366068	1.341474
0.367009	1.34136
0.367953	1.341247
0.368899	1.341134
0.369847	1.341022
0.370798	1.340911
0.371751	1.3408
0.372707	1.34069
0.373665	1.340581
0.374626	1.340472
0.375589	1.340364
0.376555	1.340256
0.377523	1.340149
0.378493	1.340043
0.379466	1.339937
0.380442	1.339832
0.38142	1.339727
0.382401	1.339623
0.383384	1.33952
0.384369	1.339417
0.385358	1.339314
0.386348	1.339213
0.387342	1.339112
0.388337	1.339011
0.389336	1.338911
0.390337	1.338811
0.39134	1.338712
0.392346	1.338614
0.393355	1.338516
0.394366	1.338419
0.39538	1.338322
0.396397	1.338226
0.397416	1.33813
0.398438	1.338035
0.399462	1.33794
0.400489	1.337846
0.401519	1.337752
0.402551	1.337659
0.403586	1.337567
0.404623	1.337474
0.405664	1.337383
0.406707	1.337292
0.407752	1.337201
0.4088	1.337111
0.409851	1.337021
0.410905	1.336932
0.411962	1.336843
0.413021	1.336755
0.414083	1.336667
0.415147	1.33658
0.416214	1.336493
0.417284	1.336407
0.418357	1.336321
0.419433	1.336235
0.420511	1.33615
0.421592	1.336066
0.422676	1.335982
0.423763	1.335898
0.424852	1.335815
0.425945	1.335732
0.42704	1.33565
0.428137	1.335568
0.429238	1.335486
0.430342	1.335405
0.431448	1.335325
0.432557	1.335245
0.433669	1.335165
0.434784	1.335086
0.435902	1.335007
0.437023	1.334928
0.438146	1.33485
0.439273	1.334773
0.440402	1.334695
0.441534	1.334618
0.44267	1.334542
0.443808	1.334466
0.444949	1.33439
0.446092	1.334315
0.447239	1.33424
0.448389	1.334166
0.449542	1.334092
0.450698	1.334018
0.451856	1.333945
0.453018	1.333872
0.454183	1.333799
0.45535	1.333727
0.456521	1.333655
0.457695	1.333584
0.458871	1.333513
0.460051	1.333442
0.461234	1.333371
0.46242	1.333302
0.463609	1.333232
0.464801	1.333163
0.465995	1.333094
0.467194	1.333025
0.468395	1.332957
0.469599	1.332889
0.470806	1.332822
0.472017	1.332755
0.47323	1.332688
0.474447	1.332621
0.475666	1.332555
0.476889	1.332489
0.478115	1.332424
0.479345	1.332359
0.480577	1.332294
0.481813	1.33223
0.483051	1.332166
0.484293	1.332102
0.485538	1.332038
0.486786	1.331975
0.488038	1.331912
0.489293	1.33185
0.490551	1.331788
0.491812	1.331726
0.493076	1.331664
0.494344	1.331603
0.495615	1.331542
0.496889	1.331482
0.498166	1.331421
0.499447	1.331361
0.500731	1.331302
0.502019	1.331242
0.503309	1.331183
0.504603	1.331125
0.5059	1.331066
0.507201	1.331008
0.508505	1.33095
0.509812	1.330892
0.511123	1.330835
0.512437	1.330778
0.513755	1.330721
0.515075	1.330665
0.5164	1.330609
0.517727	1.330553
0.519058	1.330497
0.520393	1.330442
0.521731	1.330387
0.523072	1.330332
0.524417	1.330278
0.525765	1.330224
0.527117	1.33017
0.528472	1.330116
0.529831	1.330063
0.531193	1.33001
0.532558	1.329957
0.533927	1.329904
0.5353	1.329852
0.536676	1.3298
0.538056	1.329748
0.539439	1.329697
0.540826	1.329645
0.542217	1.329594
0.543611	1.329544
0.545008	1.329493
0.546409	1.329443
0.547814	1.329393
0.549223	1.329343
0.550635	1.329294
0.55205	1.329245
0.55347	1.329196
0.554892	1.329147
0.556319	1.329098
0.557749	1.32905
0.559183	1.329002
0.560621	1.328954
0.562062	1.328907
0.563507	1.32886
0.564956	1.328813
0.566408	1.328766
0.567865	1.328719
0.569325	1.328673
0.570788	1.328627
0.572256	1.328581
0.573727	1.328535
0.575202	1.32849
0.576681	1.328445
0.578163	1.3284
0.57965	1.328355
0.58114	1.32831
0.582634	1.328266
0.584132	1.328222
0.585634	1.328178
0.587139	1.328135
0.588649	1.328091
0.590162	1.328048
0.591679	1.328005
0.593201	1.327962
0.594726	1.32792
0.596255	1.327877
0.597788	1.327835
0.599324	1.327793
0.600865	1.327752
0.60241	1.32771
0.603959	1.327669
0.605512	1.327628
0.607068	1.327587
0.608629	1.327546
0.610194	1.327506
0.611762	1.327465
0.613335	1.327425
0.614912	1.327385
0.616493	1.327346
0.618078	1.327306
0.619667	1.327267
0.62126	1.327228
0.622857	1.327189
0.624459	1.32715
0.626064	1.327112
0.627674	1.327074
0.629287	1.327036
0.630905	1.326998
0.632527	1.32696
0.634153	1.326922
0.635784	1.326885
0.637418	1.326848
0.639057	1.326811
0.6407	1.326774

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/Kozma.yml
ID: ds_813121c440c2
API: /v1/datasets/ds_813121c440c2

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