Optical constants

Refractive index of C₄H₉OH (Butanol)

Wang et al. 2018: n-Butanol, 60 °C; n,k 1.66–19.1 µm

Data: tabulated nk
Range: 1.66–19.06 µm
Points: 488
Temperature: 333 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.36586
Extinction coefficient k: 0.0012636

Permittivity ε₁: 1.86556
Permittivity ε₂: 0.00345179

Absorption coefficient α: 28.2542 cm⁻¹
Penetration depth δ = λ/(2πk): 707859 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.074 µm⁻¹

Group index n_g: 0.949976
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.220612 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

# C4H9OH (Butanol): Wang et al. 2018: n-Butanol, 60 °C; n,k 1.66–19.1 µm
c4h9oh = ls.fetch_refractiveindex("organic", "butanol", "Wang-60C", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c4h9oh.range_nm)  # (1660, 19060) nm
eps = c4h9oh.eps([5620])  # 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_88b0481ce30f/lightsmith"
c4h9oh = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c4h9oh.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (butanol/wang-2018-60c).

# ... load c4h9oh as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c4h9oh)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=1660, stop_nm=19060, 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.

Comments and conditions

n-butanol, 60 °C.

Conditions

temperature: 333 K

References

C. C. Wang, J. Y. Tan, C. Y. Jing, L. H. Liu. Temperature-dependent optical constants of liquid isopropanol, n-butanol and n-decane. Appl. Opt. 57, 3303-3311 (2018) (Numerical data kindly provided by Chengchao Wang)

doi:10.1364/ao.57.003003 Temperature-dependent optical constants of liquid isopropanol, n-butanol, and n-decane, Applied Optics (2018)

Cite

C. C. Wang, J. Y. Tan, C. Y. Jing and L. H. Liu. Temperature-dependent optical constants of liquid isopropanol, n-butanol, and n-decane. Applied Optics, 57, 3003 (2018), doi:10.1364/ao.57.003003; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

488 rows as published

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

C4H9OH (Butanol), Wang et al. 2018: n-Butanol, 60 °C; n,k 1.66–19.1 µm: n and k versus wavelength
λ (µm)	n	k
1.66	1.41096	3.301e-05
1.668	1.41028	3.4389e-05
1.679	1.40534	4.2973e-05
1.69	1.39711	6.6524e-05
1.699	1.39609	8.9808e-05
1.708	1.39407	0.00010869
1.719	1.39204	0.00011361
1.728	1.39027	0.00010127
1.74	1.38926	9.1805e-05
1.749	1.38948	9.1976e-05
1.759	1.39048	8.4953e-05
1.768	1.39007	6.9394e-05
1.778	1.38873	5.7641e-05
1.788	1.38723	5.3269e-05
1.798	1.38571	4.8922e-05
1.808	1.38412	4.4076e-05
1.818	1.38254	4.2106e-05
1.828	1.38072	3.8536e-05
1.839	1.37927	3.3143e-05
1.849	1.37854	2.7868e-05
1.86	1.37787	2.4168e-05
1.868	1.3768	2.2669e-05
1.879	1.37676	2.2259e-05
1.89	1.3778	2.073e-05
1.898	1.37887	2.0355e-05
1.909	1.37866	2.3022e-05
1.917	1.37828	2.5141e-05
1.929	1.37794	2.5284e-05
1.938	1.37773	2.4397e-05
1.949	1.37823	2.445e-05
1.958	1.37866	2.5573e-05
1.97	1.37801	2.6685e-05
1.979	1.3766	2.6842e-05
1.988	1.3755	2.8525e-05
1.997	1.37584	3.3519e-05
2.01	1.37628	4.224e-05
2.019	1.37629	4.9694e-05
2.029	1.3765	5.9699e-05
2.038	1.37661	7.3055e-05
2.048	1.37681	9.0073e-05
2.058	1.3768	0.00010813
2.067	1.37626	0.00012503
2.077	1.37511	0.00013928
2.087	1.37359	0.00014757
2.097	1.37283	0.0001469
2.108	1.37251	0.00013903
2.118	1.3723	0.00012762
2.128	1.37216	0.00011587
2.139	1.3722	0.00010676
2.15	1.37239	9.8157e-05
2.157	1.37292	9.3217e-05
2.168	1.37375	8.7154e-05
2.179	1.37464	8.3453e-05
2.19	1.37466	8.3116e-05
2.197	1.37409	8.3821e-05
2.208	1.37307	8.5846e-05
2.22	1.37227	9.0705e-05
2.227	1.37156	9.7607e-05
2.239	1.37105	0.00012229
2.246	1.3708	0.00015652
2.258	1.37017	0.00025439
2.266	1.36948	0.00035264
2.278	1.36932	0.0005221
2.286	1.37016	0.00062812
2.298	1.37136	0.00074233
2.306	1.37171	0.00074776
2.319	1.37143	0.00066289
2.327	1.37098	0.0006094
2.34	1.37017	0.00056469
2.348	1.36961	0.00054089
2.357	1.3691	0.00051814
2.37	1.36866	0.00049667
2.378	1.36807	0.00049429
2.387	1.36759	0.00050529
2.396	1.3677	0.00051244
2.409	1.36808	0.00048027
2.418	1.36812	0.00045755
2.427	1.36805	0.00045491
2.437	1.36813	0.00048211
2.446	1.36857	0.00053802
2.46	1.36855	0.00057547
2.469	1.36823	0.00054077
2.478	1.36752	0.00050514
2.488	1.36685	0.00049114
2.498	1.36633	0.00048911
2.507	1.36626	0.00046802
2.517	1.36657	0.00041165
2.527	1.36695	0.00035099
2.537	1.36691	0.00031244
2.547	1.36657	0.00029618
2.557	1.36616	0.00029069
2.567	1.36608	0.00028649
2.577	1.36599	0.00028343
2.587	1.366	0.00028718
2.598	1.3657	0.00029242
2.608	1.36514	0.00028637
2.619	1.36416	0.00026326
2.629	1.36315	0.00024159
2.64	1.36238	0.00023755
2.645	1.36189	0.00024065
2.656	1.36145	0.0002468
2.667	1.36106	0.00024862
2.678	1.36031	0.00025646
2.689	1.35981	0.00028023
2.695	1.35948	0.00029546
2.706	1.35938	0.00032841
2.717	1.35959	0.00037427
2.729	1.35934	0.00046234
2.735	1.35909	0.0005349
2.746	1.35825	0.00074286
2.758	1.35634	0.00097016
2.77	1.35362	0.00121
2.776	1.35202	0.00138
2.788	1.34972	0.00186
2.8	1.34751	0.00264
2.806	1.34738	0.01048
2.818	1.34474	0.01464
2.824	1.34378	0.01588
2.836	1.34139	0.01792
2.849	1.34231	0.01785
2.855	1.34338	0.01855
2.868	1.34192	0.02534
2.874	1.3426	0.02753
2.887	1.3451	0.03213
2.9	1.34438	0.03787
2.906	1.34497	0.041
2.919	1.34722	0.04761
2.926	1.34879	0.05167
2.939	1.35424	0.05115
2.946	1.3577	0.04844
2.959	1.36459	0.05019
2.966	1.36823	0.05257
2.98	1.3702	0.05506
2.987	1.37171	0.05624
2.994	1.3747	0.05627
3.007	1.37947	0.053
3.014	1.3804	0.05179
3.029	1.38484	0.05042
3.036	1.38697	0.05011
3.05	1.38919	0.04393
3.057	1.39	0.04052
3.064	1.39052	0.03697
3.079	1.39102	0.03003
3.086	1.39044	0.03023
3.094	1.3901	0.03078
3.108	1.38894	0.02972
3.116	1.38774	0.02967
3.123	1.38622	0.02937
3.139	1.38714	0.02502
3.146	1.38762	0.02243
3.154	1.38702	0.02002
3.169	1.38408	0.01647
3.177	1.38292	0.01501
3.185	1.3821	0.01387
3.193	1.38139	0.01353
3.208	1.37988	0.01216
3.216	1.37887	0.0117
3.224	1.37749	0.01096
3.232	1.37619	0.01012
3.249	1.37177	0.00824
3.257	1.36935	0.00957
3.265	1.3674	0.01065
3.273	1.36556	0.01053
3.29	1.36326	0.00791
3.298	1.36128	0.00656
3.307	1.35809	0.00619
3.315	1.35325	0.00803
3.324	1.34737	0.0125
3.332	1.3414	0.01575
3.349	1.325	0.02605
3.358	1.31871	0.03899
3.367	1.32172	0.06104
3.376	1.33755	0.08138
3.384	1.35766	0.0876
3.393	1.37058	0.08731
3.402	1.3797	0.08953
3.411	1.39243	0.08829
3.429	1.40838	0.06683
3.438	1.40803	0.05621
3.447	1.40525	0.04975
3.457	1.40177	0.04992
3.466	1.40088	0.05759
3.475	1.40717	0.06503
3.484	1.41946	0.06352
3.494	1.4288	0.05311
3.503	1.43037	0.04105
3.513	1.42778	0.03153
3.522	1.42369	0.02511
3.532	1.4189	0.01983
3.542	1.41438	0.01589
3.551	1.41113	0.01305
3.561	1.40769	0.01223
3.571	1.40493	0.01204
3.581	1.4043	0.01044
3.591	1.4035	0.0085
3.601	1.4016	0.00775
3.611	1.3996	0.00831
3.621	1.39854	0.00811
3.631	1.39737	0.00709
3.641	1.39533	0.00679
3.651	1.39294	0.00785
3.662	1.3931	0.00798
3.672	1.39449	0.00716
3.682	1.39436	0.00484
3.693	1.39373	0.00529
3.704	1.39433	0.00491
3.714	1.3947	0.00457
3.725	1.39312	0.0044
3.736	1.39043	0.00426
3.746	1.38861	0.00413
3.757	1.3879	0.0039
3.768	1.38862	0.00363
3.779	1.39014	0.00345
3.79	1.39026	0.00332
3.801	1.38868	0.0032
3.812	1.38713	0.00307
3.824	1.38622	0.00293
3.835	1.38654	0.00281
3.846	1.3862	0.00274
3.858	1.385	0.00274
3.869	1.38445	0.00276
3.881	1.38382	0.00278
3.893	1.3837	0.00275
3.904	1.38389	0.00269
3.916	1.38395	0.00261
3.928	1.38456	0.00252
3.94	1.38471	0.00242
3.952	1.38364	0.00233
3.964	1.38245	0.00223
3.976	1.38078	0.00212
3.988	1.37995	0.00201
4.001	1.37956	0.00191
4.013	1.38121	0.00182
4.026	1.3832	0.00175
4.038	1.3834	0.0017
4.051	1.38232	0.00165
4.063	1.38096	0.0016
4.076	1.38045	0.00156
4.089	1.38119	0.00153
4.102	1.38114	0.00152
4.115	1.38082	0.00153
4.128	1.37968	0.00153
4.141	1.3793	0.00152
4.155	1.38024	0.0015
4.168	1.38085	0.00143
4.181	1.38003	0.00134
4.195	1.37786	0.00127
4.209	1.37673	0.00122
4.222	1.37619	0.00118
4.236	1.37647	0.00115
4.25	1.37824	0.00115
4.264	1.3781	0.00115
4.278	1.37674	0.00116
4.292	1.37684	0.00116
4.306	1.3773	0.00113
4.321	1.37715	0.00108
4.335	1.37663	0.00102
4.35	1.37747	0.00097026
4.364	1.37836	0.00094062
4.379	1.37801	0.00092107
4.394	1.37764	0.00090667
4.409	1.37788	0.00089716
4.424	1.37834	0.00089771
4.439	1.3782	0.00089903
4.454	1.37749	0.00089243
4.47	1.37667	0.00088483
4.485	1.37689	0.00088436
4.501	1.37706	0.00088936
4.516	1.37624	0.00090287
4.532	1.37543	0.00092298
4.548	1.37532	0.00093904
4.564	1.37643	0.00094922
4.58	1.37628	0.000957
4.597	1.37526	0.00095996
4.613	1.37576	0.00094243
4.629	1.37561	0.00090619
4.646	1.37498	0.00087376
4.663	1.37506	0.00085574
4.68	1.37519	0.00084577
4.696	1.3745	0.00084126
4.714	1.37394	0.0008476
4.731	1.37394	0.00087875
4.748	1.37248	0.00093878
4.766	1.3715	0.00101
4.783	1.37181	0.00106
4.801	1.37249	0.00108
4.819	1.37268	0.0011
4.837	1.3725	0.00111
4.855	1.37277	0.00114
4.873	1.373	0.00121
4.891	1.37238	0.0013
4.91	1.371	0.00136
4.929	1.37047	0.00136
4.947	1.3705	0.00129
4.966	1.37033	0.00117
4.985	1.37044	0.00105
5.005	1.37136	0.00099163
5.024	1.37142	0.00101
5.044	1.3721	0.00107
5.063	1.37254	0.00109
5.083	1.37109	0.00106
5.103	1.37109	0.00104
5.123	1.37165	0.00105
5.144	1.37048	0.00104
5.164	1.36969	0.00104
5.185	1.37053	0.00109
5.206	1.37071	0.00115
5.227	1.37155	0.00116
5.248	1.37051	0.00111
5.269	1.36838	0.00106
5.291	1.36802	0.00104
5.312	1.36899	0.00105
5.334	1.36845	0.00108
5.356	1.36749	0.00111
5.379	1.36659	0.00113
5.401	1.3671	0.00111
5.424	1.36756	0.00109
5.446	1.36789	0.00107
5.469	1.36915	0.00109
5.492	1.36827	0.00112
5.516	1.36657	0.00116
5.539	1.36629	0.00122
5.563	1.36582	0.00126
5.587	1.36496	0.00127
5.611	1.36519	0.00126
5.636	1.36704	0.00127
5.66	1.36659	0.00128
5.685	1.36497	0.00132
5.71	1.36469	0.00139
5.736	1.36401	0.00147
5.761	1.36304	0.00151
5.787	1.36265	0.00156
5.813	1.36355	0.00163
5.839	1.36573	0.00168
5.865	1.36482	0.00171
5.892	1.36252	0.00176
5.919	1.36073	0.00181
5.946	1.36013	0.00184
5.973	1.3601	0.0019
6.001	1.36086	0.00196
6.029	1.36144	0.00204
6.057	1.361	0.00212
6.086	1.3615	0.00216
6.114	1.36201	0.00223
6.143	1.36285	0.00233
6.173	1.36207	0.00243
6.202	1.36141	0.00253
6.232	1.35915	0.00264
6.262	1.35916	0.00276
6.292	1.36067	0.00289
6.323	1.36066	0.00305
6.354	1.35866	0.00321
6.385	1.35724	0.00337
6.417	1.35487	0.00359
6.449	1.35354	0.00386
6.481	1.35452	0.00418
6.514	1.35314	0.00465
6.547	1.35095	0.00524
6.58	1.34701	0.00632
6.613	1.34396	0.00994
6.647	1.34278	0.01258
6.682	1.33892	0.0151
6.716	1.33616	0.01819
6.751	1.33561	0.02474
6.787	1.33892	0.03609
6.822	1.34796	0.04696
6.858	1.36057	0.04625
6.895	1.36911	0.03775
6.932	1.36964	0.03485
6.969	1.36649	0.0348
7.007	1.36786	0.03251
7.045	1.36962	0.03007
7.083	1.3701	0.02873
7.122	1.36788	0.02778
7.161	1.36414	0.02887
7.201	1.36216	0.03367
7.241	1.36811	0.03987
7.282	1.37705	0.03757
7.323	1.37878	0.02982
7.365	1.37612	0.02621
7.407	1.37325	0.02334
7.45	1.3735	0.02165
7.493	1.37748	0.02104
7.536	1.37805	0.02193
7.58	1.37852	0.02161
7.625	1.37839	0.01912
7.67	1.37563	0.01794
7.716	1.37411	0.0187
7.762	1.37385	0.01849
7.809	1.37243	0.0171
7.856	1.36982	0.01406
7.904	1.36769	0.01398
7.952	1.36558	0.01758
8.001	1.36465	0.01875
8.051	1.36506	0.01536
8.101	1.36158	0.01667
8.152	1.36034	0.02004
8.204	1.36485	0.01751
8.256	1.36791	0.01681
8.309	1.36732	0.01766
8.363	1.36719	0.0148
8.417	1.36797	0.01127
8.472	1.36282	0.01096
8.528	1.35584	0.01404
8.584	1.35167	0.01371
8.642	1.34811	0.01099
8.7	1.34494	0.01186
8.758	1.34233	0.01284
8.818	1.3357	0.01681
8.878	1.32807	0.02312
8.939	1.32787	0.03161
9.002	1.33581	0.0395
9.065	1.33784	0.04129
9.128	1.32724	0.03881
9.193	1.3068	0.05255
9.259	1.30112	0.09244
9.325	1.34149	0.12043
9.393	1.37875	0.10659
9.462	1.38067	0.09065
9.531	1.37819	0.09734
9.602	1.39359	0.10708
9.673	1.41493	0.103
9.746	1.42708	0.08481
9.82	1.427	0.06572
9.895	1.42339	0.05594
9.971	1.41803	0.0456
10.04	1.41069	0.03996
10.12	1.40993	0.03391
10.2	1.40663	0.02399
10.28	1.39925	0.02257
10.37	1.39554	0.03011
10.45	1.39987	0.04074
10.53	1.41162	0.04178
10.62	1.41737	0.02908
10.71	1.41267	0.01675
10.8	1.40058	0.01281
10.89	1.391	0.01317
10.98	1.38761	0.01709
11.07	1.38929	0.01792
11.17	1.38942	0.01497
11.27	1.38961	0.01113
11.37	1.38484	0.01223
11.47	1.37831	0.01337
11.57	1.37145	0.0208
11.67	1.37104	0.02887
11.78	1.38362	0.03176
11.89	1.39496	0.02735
12.0	1.39341	0.02062
12.11	1.38808	0.01692
12.22	1.38265	0.01889
12.34	1.37868	0.02269
12.46	1.38267	0.01864
12.58	1.3807	0.018
12.7	1.37654	0.01857
12.83	1.37673	0.01609
12.96	1.37292	0.01808
13.09	1.36603	0.02277
13.22	1.36669	0.03083
13.36	1.37098	0.0376
13.5	1.37703	0.03832
13.64	1.37645	0.04546
13.79	1.3776	0.04372
13.93	1.38267	0.03604
14.08	1.37888	0.03639
14.24	1.37692	0.03956
14.4	1.37483	0.04121
14.56	1.37555	0.0409
14.73	1.3835	0.03718
14.89	1.39388	0.03163
15.07	1.39229	0.03407
15.25	1.3916	0.04853
15.43	1.39504	0.05119
15.61	1.39259	0.05083
15.8	1.40585	0.03811
16.0	1.42035	0.03212
16.2	1.43299	0.0295
16.4	1.43699	0.02875
16.61	1.40666	0.02896
16.83	1.38635	0.02384
17.05	1.40038	0.00313
17.28	1.40388	0.02261
17.51	1.40068	0.03967
17.75	1.41917	0.06814
18.0	1.42237	0.09095
18.25	1.40255	0.07762
18.51	1.41958	0.09308
18.78	1.41977	0.06783
19.06	1.45436	0.00705

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: —

C₄H₉OH (Butanol): all datasets

About C4H9OH (Butanol)

Butanol (C₄H₁₀O) refers to a group of four isomeric alcohol compounds with a four-carbon structure. The isomers include n-butanol (or 1-butanol), isobutanol (or 2-methyl-1-propanol), sec-butanol (or 2-butanol), and tert-butanol (or 2-methyl-2-propanol). Of these, n-butanol is the most commonly referred to when discussing "butanol." Butanol is a colorless liquid at room temperature with a characteristic alcoholic odor. It is moderately soluble in water but is very soluble in most organic solvents. It's utilized in a wide variety of applications, including as a solvent in the manufacturing of resins, plasticizers, and other chemicals. It's also employed in the formulation of paints, coatings, varnishes, and inks. In addition, butanol is considered a potential biofuel, as it can be produced from biomass sources and has properties comparable to gasoline. Chemical formula (n-Butanol): CH₃(CH₂)₃OH or C₄H₉OH Chemical formula (sec-Butanol): CH₃CH(OH)CH₂CH₃ Chemical formula (Isobutanol): (CH₃)₂CHCH₂OH Chemical formula (tert-Butanol): (CH₃)₃COH

More about C4H9OH (Butanol) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C4H10O - butanol/nk/Wang-60C.yml
ID: ds_88b0481ce30f
API: /v1/datasets/ds_88b0481ce30f

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