Optical constants

Refractive index of CH₂Cl₂ (Dichloromethane, DCM)

Li et al. 2022: n 0.2–1.7 µm

Data: formula 5
Range: 0.2–1.7 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.4255
Extinction coefficient k: 0

Permittivity ε₁: 2.03204
Permittivity ε₂: 0

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

Abbe number V_d: 38.3
Chromatic dispersion dn/dλ: -0.0566074 µm⁻¹

Group index n_g: 1.45876
Group velocity dispersion: 110.763 fs²/mm

Dispersion parameter D: -604.27 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

# CH2Cl2 (Dichloromethane, DCM): Li et al. 2022: n 0.2–1.7 µm
ch2cl2 = ls.fetch_refractiveindex("organic", "dichloromethane", "Li", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ch2cl2.range_nm)  # (200, 1700) nm
eps = ch2cl2.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_cd9177a2afb2/lightsmith"
ch2cl2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ch2cl2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (dichloromethane/li-2022).

# ... load ch2cl2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ch2cl2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, 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 = 1.4097 + 0.005165 λ^{- 2.0} + 0.0001001 λ^{- 4.0} - 9.924 \times 10^{-8} λ^{- 6.0}

Valid from 0.2 to 1.7 µm.

Coefficients as stored

C_i	Value
C1	1.4097
C2	0.005165
C3	-2.0
C4	0.0001001
C5	-4.0
C6	-9.924e-08
C7	-6.0

Comments and conditions

Room temperature.

References

X. Li, C. Wang, L. Ma, L. Liu. Ellipsometry-transmission measurement of the complex refractive indices for a series of organic solvents in the 200–1700 nm spectral range. Infrared Phys. Technol. 125, 104313 (2022)

doi:10.1016/j.infrared.2022.104313 Ellipsometry-transmission measurement of the complex refractive indices for a series of organic solvents in the 200–1700 nm spectral range, Infrared Physics & Technology (2022)

Cite

Xiaoning Li, Chengchao Wang, Lanxin Ma and Linhua Liu. Ellipsometry-transmission measurement of the complex refractive indices for a series of organic solvents in the 200–1700 nm spectral range. Infrared Physics & Technology, 125, 104313 (2022), doi:10.1016/j.infrared.2022.104313; 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

CH2Cl2 (Dichloromethane, DCM), Li et al. 2022: n 0.2–1.7 µm: n and k versus wavelength
λ (µm)	n
0.2	1.599837
0.201076	1.59718
0.202157	1.594565
0.203244	1.59199
0.204337	1.589456
0.205436	1.58696
0.206541	1.584503
0.207652	1.582085
0.208768	1.579703
0.209891	1.577358
0.21102	1.575049
0.212155	1.572775
0.213296	1.570537
0.214443	1.568332
0.215596	1.566161
0.216756	1.564024
0.217921	1.561919
0.219093	1.559845
0.220272	1.557804
0.221456	1.555793
0.222647	1.553812
0.223845	1.551862
0.225049	1.549941
0.226259	1.548048
0.227476	1.546185
0.228699	1.544349
0.229929	1.54254
0.231165	1.540759
0.232409	1.539004
0.233659	1.537276
0.234915	1.535573
0.236179	1.533895
0.237449	1.532242
0.238726	1.530614
0.24001	1.52901
0.2413	1.527429
0.242598	1.525872
0.243903	1.524338
0.245214	1.522826
0.246533	1.521336
0.247859	1.519868
0.249192	1.518422
0.250532	1.516996
0.25188	1.515592
0.253234	1.514208
0.254596	1.512844
0.255965	1.511499
0.257342	1.510174
0.258726	1.508868
0.260117	1.507581
0.261516	1.506313
0.262923	1.505063
0.264337	1.50383
0.265758	1.502616
0.267187	1.501418
0.268624	1.500238
0.270069	1.499075
0.271521	1.497928
0.272982	1.496797
0.27445	1.495683
0.275926	1.494584
0.27741	1.493501
0.278902	1.492433
0.280402	1.49138
0.28191	1.490342
0.283426	1.489318
0.28495	1.488309
0.286482	1.487314
0.288023	1.486333
0.289572	1.485365
0.291129	1.484411
0.292695	1.48347
0.294269	1.482542
0.295852	1.481627
0.297443	1.480725
0.299042	1.479835
0.300651	1.478958
0.302268	1.478092
0.303893	1.477239
0.305527	1.476397
0.307171	1.475567
0.308823	1.474748
0.310483	1.47394
0.312153	1.473143
0.313832	1.472357
0.31552	1.471582
0.317217	1.470817
0.318923	1.470062
0.320638	1.469318
0.322362	1.468584
0.324096	1.46786
0.325839	1.467145
0.327591	1.46644
0.329353	1.465745
0.331124	1.465059
0.332905	1.464382
0.334695	1.463714
0.336495	1.463055
0.338305	1.462404
0.340124	1.461763
0.341954	1.46113
0.343793	1.460505
0.345641	1.459889
0.3475	1.45928
0.349369	1.45868
0.351248	1.458088
0.353137	1.457503
0.355036	1.456926
0.356946	1.456357
0.358865	1.455795
0.360795	1.45524
0.362736	1.454693
0.364686	1.454153
0.366648	1.45362
0.368619	1.453093
0.370602	1.452574
0.372595	1.452061
0.374599	1.451555
0.376613	1.451056
0.378639	1.450563
0.380675	1.450076
0.382722	1.449596
0.384781	1.449121
0.38685	1.448653
0.38893	1.448191
0.391022	1.447735
0.393125	1.447284
0.395239	1.44684
0.397365	1.446401
0.399502	1.445967
0.40165	1.445539
0.40381	1.445117
0.405982	1.4447
0.408166	1.444288
0.410361	1.443881
0.412568	1.443479
0.414786	1.443083
0.417017	1.442691
0.41926	1.442305
0.421515	1.441923
0.423781	1.441546
0.42606	1.441174
0.428352	1.440807
0.430656	1.440444
0.432972	1.440085
0.4353	1.439731
0.437641	1.439382
0.439995	1.439036
0.442361	1.438696
0.44474	1.438359
0.447132	1.438026
0.449537	1.437698
0.451954	1.437374
0.454385	1.437053
0.456828	1.436737
0.459285	1.436424
0.461755	1.436116
0.464239	1.435811
0.466735	1.43551
0.469245	1.435212
0.471769	1.434918
0.474306	1.434628
0.476857	1.434341
0.479421	1.434058
0.482	1.433779
0.484592	1.433502
0.487198	1.433229
0.489818	1.43296
0.492452	1.432693
0.495101	1.43243
0.497763	1.43217
0.50044	1.431913
0.503132	1.43166
0.505838	1.431409
0.508558	1.431161
0.511293	1.430917
0.514043	1.430675
0.516807	1.430436
0.519587	1.4302
0.522381	1.429967
0.52519	1.429737
0.528015	1.429509
0.530854	1.429284
0.533709	1.429062
0.53658	1.428843
0.539465	1.428626
0.542367	1.428411
0.545283	1.4282
0.548216	1.42799
0.551164	1.427783
0.554128	1.427579
0.557109	1.427377
0.560105	1.427178
0.563117	1.426981
0.566145	1.426786
0.56919	1.426593
0.572251	1.426403
0.575329	1.426215
0.578423	1.426029
0.581534	1.425846
0.584661	1.425664
0.587805	1.425485
0.590967	1.425308
0.594145	1.425132
0.59734	1.424959
0.600553	1.424788
0.603782	1.424619
0.607029	1.424452
0.610294	1.424287
0.613576	1.424124
0.616876	1.423962
0.620194	1.423803
0.623529	1.423645
0.626882	1.42349
0.630254	1.423336
0.633643	1.423184
0.637051	1.423033
0.640477	1.422885
0.643921	1.422738
0.647384	1.422592
0.650866	1.422449
0.654366	1.422307
0.657885	1.422167
0.661424	1.422028
0.664981	1.421891
0.668557	1.421756
0.672152	1.421622
0.675767	1.421489
0.679402	1.421358
0.683055	1.421229
0.686729	1.421101
0.690422	1.420975
0.694135	1.42085
0.697868	1.420726
0.701621	1.420604
0.705395	1.420484
0.709188	1.420364
0.713002	1.420246
0.716837	1.42013
0.720692	1.420015
0.724568	1.419901
0.728464	1.419788
0.732382	1.419677
0.736321	1.419566
0.740281	1.419458
0.744262	1.41935
0.748265	1.419244
0.752289	1.419138
0.756335	1.419034
0.760402	1.418932
0.764492	1.41883
0.768603	1.418729
0.772736	1.41863
0.776892	1.418532
0.78107	1.418435
0.785271	1.418339
0.789494	1.418244
0.79374	1.41815
0.798009	1.418057
0.8023	1.417965
0.806615	1.417875
0.810953	1.417785
0.815314	1.417696
0.819699	1.417608
0.824108	1.417522
0.82854	1.417436
0.832995	1.417351
0.837475	1.417267
0.841979	1.417185
0.846507	1.417103
0.85106	1.417022
0.855637	1.416941
0.860238	1.416862
0.864865	1.416784
0.869516	1.416706
0.874192	1.41663
0.878894	1.416554
0.88362	1.416479
0.888372	1.416405
0.89315	1.416332
0.897953	1.416259
0.902783	1.416188
0.907638	1.416117
0.912519	1.416047
0.917427	1.415978
0.92236	1.415909
0.927321	1.415842
0.932308	1.415775
0.937322	1.415708
0.942363	1.415643
0.947431	1.415578
0.952526	1.415514
0.957649	1.415451
0.962799	1.415388
0.967977	1.415326
0.973183	1.415265
0.978416	1.415205
0.983678	1.415145
0.988969	1.415085
0.994287	1.415027
0.999634	1.414969
1.00501	1.414912
1.01042	1.414855
1.01585	1.414799
1.02131	1.414744
1.02681	1.414689
1.03233	1.414635
1.03788	1.414581
1.04346	1.414528
1.04907	1.414476
1.05471	1.414424
1.06039	1.414373
1.06609	1.414322
1.07182	1.414272
1.07759	1.414222
1.08338	1.414173
1.08921	1.414125
1.09507	1.414077
1.10096	1.414029
1.10688	1.413982
1.11283	1.413936
1.11881	1.41389
1.12483	1.413845
1.13088	1.4138
1.13696	1.413755
1.14308	1.413712
1.14922	1.413668
1.1554	1.413625
1.16162	1.413583
1.16787	1.413541
1.17415	1.413499
1.18046	1.413458
1.18681	1.413417
1.19319	1.413377
1.19961	1.413337
1.20606	1.413298
1.21255	1.413259
1.21907	1.413221
1.22562	1.413183
1.23222	1.413145
1.23884	1.413108
1.2455	1.413071
1.2522	1.413035
1.25894	1.412999
1.26571	1.412963
1.27251	1.412928
1.27936	1.412893
1.28624	1.412859
1.29316	1.412824
1.30011	1.412791
1.3071	1.412757
1.31413	1.412724
1.3212	1.412692
1.32831	1.412659
1.33545	1.412628
1.34263	1.412596
1.34985	1.412565
1.35711	1.412534
1.36441	1.412503
1.37175	1.412473
1.37912	1.412443
1.38654	1.412414
1.394	1.412384
1.4015	1.412356
1.40903	1.412327
1.41661	1.412299
1.42423	1.412271
1.43189	1.412243
1.43959	1.412216
1.44733	1.412188
1.45511	1.412162
1.46294	1.412135
1.47081	1.412109
1.47872	1.412083
1.48667	1.412057
1.49467	1.412032
1.5027	1.412007
1.51079	1.411982
1.51891	1.411958
1.52708	1.411933
1.53529	1.411909
1.54355	1.411885
1.55185	1.411862
1.5602	1.411839
1.56859	1.411816
1.57702	1.411793
1.5855	1.41177
1.59403	1.411748
1.6026	1.411726
1.61122	1.411704
1.61989	1.411683
1.6286	1.411662
1.63736	1.41164
1.64616	1.41162
1.65502	1.411599
1.66392	1.411579
1.67286	1.411558
1.68186	1.411538
1.69091	1.411519
1.7	1.411499

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: —

CH₂Cl₂ (Dichloromethane, DCM): all datasets

About CH2Cl2 (Dichloromethane, DCM)

Dichloromethane (CH₂Cl₂), also known as methylene chloride, is a volatile, colorless liquid with a characteristic sweet odor. It is commonly used as a solvent in paint strippers, aerosol formulations, and various chemical extraction processes, including the decaffeination of coffee. Due to its relatively high volatility, care must be taken when handling dichloromethane to avoid excessive inhalation, as prolonged exposure can pose health risks. In the realm of optics and spectroscopy, dichloromethane’s refractive properties are of interest for studying solvent effects and reaction kinetics. Its ability to dissolve a wide range of organic compounds, combined with its transparent nature in certain wavelengths, makes it valuable in laboratory-based optical and spectroscopic measurements.

More about CH2Cl2 (Dichloromethane, DCM) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/CH2Cl2 - dichloromethane/nk/Li.yml
ID: ds_cd9177a2afb2
API: /v1/datasets/ds_cd9177a2afb2

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