Optical constants

Refractive index of C₈H₁₀ (Xylene)

Li et al. 2022: para-Xylene (PX); n 0.226–1.7 µm

Data: formula 5
Range: 0.226–1.7 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.49958
Extinction coefficient k: 0

Permittivity ε₁: 2.24874
Permittivity ε₂: 0

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

Abbe number V_d: 26.592
Chromatic dispersion dn/dλ: -0.0996525 µm⁻¹

Group index n_g: 1.55813
Group velocity dispersion: 147.779 fs²/mm

Dispersion parameter D: -806.213 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

# C8H10 (Xylene): Li et al. 2022: para-Xylene (PX); n 0.226–1.7 µm
c8h10 = ls.fetch_refractiveindex("organic", "xylene", "Li", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c8h10.range_nm)  # (226, 1700) nm
eps = c8h10.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_91e0c0c282bc/lightsmith"
c8h10 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c8h10.source)  # citation and provenance travel with the data

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

# ... load c8h10 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c8h10)],
    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 = 1.4641 + 0.01508 λ^{- 2.0} - 0.001215 λ^{- 4.0} + 8.213 \times 10^{-5} λ^{- 6.0}

Valid from 0.226 to 1.7 µm.

Coefficients as stored

C_i	Value
C1	1.4641
C2	0.01508
C3	-2.0
C4	-0.001215
C5	-4.0
C6	8.213e-05
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

C8H10 (Xylene), Li et al. 2022: para-Xylene (PX); n 0.226–1.7 µm: n and k versus wavelength
λ (µm)	n
0.226	1.909991
0.227146	1.897924
0.228297	1.886251
0.229455	1.874959
0.230618	1.864035
0.231788	1.853466
0.232963	1.843242
0.234144	1.833351
0.235331	1.823781
0.236524	1.814522
0.237723	1.805564
0.238929	1.796896
0.24014	1.78851
0.241358	1.780395
0.242581	1.772542
0.243811	1.764944
0.245047	1.75759
0.24629	1.750474
0.247538	1.743586
0.248793	1.736921
0.250055	1.730469
0.251323	1.724224
0.252597	1.718179
0.253878	1.712327
0.255165	1.706662
0.256458	1.701178
0.257759	1.695867
0.259066	1.690725
0.260379	1.685746
0.261699	1.680924
0.263026	1.676254
0.26436	1.671731
0.2657	1.66735
0.267047	1.663105
0.268401	1.658994
0.269762	1.65501
0.271129	1.651149
0.272504	1.647408
0.273886	1.643782
0.275274	1.640268
0.27667	1.636861
0.278073	1.633558
0.279483	1.630355
0.2809	1.62725
0.282324	1.624238
0.283755	1.621316
0.285194	1.618482
0.28664	1.615732
0.288093	1.613063
0.289554	1.610474
0.291022	1.60796
0.292497	1.60552
0.29398	1.60315
0.295471	1.600849
0.296969	1.598614
0.298475	1.596443
0.299988	1.594333
0.301509	1.592283
0.303037	1.590291
0.304574	1.588354
0.306118	1.58647
0.30767	1.584639
0.30923	1.582857
0.310798	1.581124
0.312374	1.579437
0.313957	1.577795
0.315549	1.576196
0.317149	1.57464
0.318757	1.573124
0.320373	1.571647
0.321997	1.570208
0.32363	1.568805
0.325271	1.567438
0.32692	1.566104
0.328577	1.564804
0.330243	1.563535
0.331918	1.562297
0.333601	1.561088
0.335292	1.559908
0.336992	1.558756
0.3387	1.55763
0.340418	1.55653
0.342144	1.555455
0.343878	1.554404
0.345622	1.553376
0.347374	1.552371
0.349135	1.551387
0.350906	1.550424
0.352685	1.549482
0.354473	1.548559
0.35627	1.547655
0.358076	1.546769
0.359892	1.545901
0.361716	1.54505
0.36355	1.544216
0.365394	1.543397
0.367246	1.542594
0.369108	1.541806
0.37098	1.541032
0.37286	1.540272
0.374751	1.539526
0.376651	1.538793
0.378561	1.538072
0.38048	1.537364
0.382409	1.536668
0.384348	1.535983
0.386296	1.535309
0.388255	1.534646
0.390223	1.533993
0.392202	1.533351
0.39419	1.532718
0.396189	1.532095
0.398198	1.531481
0.400217	1.530876
0.402246	1.53028
0.404285	1.529692
0.406335	1.529112
0.408395	1.52854
0.410466	1.527975
0.412547	1.527419
0.414638	1.526869
0.416741	1.526326
0.418854	1.525791
0.420977	1.525262
0.423112	1.524739
0.425257	1.524223
0.427413	1.523712
0.42958	1.523208
0.431758	1.52271
0.433947	1.522217
0.436147	1.521729
0.438358	1.521247
0.440581	1.520771
0.442815	1.520299
0.44506	1.519832
0.447316	1.51937
0.449584	1.518913
0.451864	1.518461
0.454155	1.518013
0.456457	1.517569
0.458771	1.51713
0.461097	1.516695
0.463435	1.516264
0.465785	1.515837
0.468146	1.515414
0.47052	1.514995
0.472906	1.51458
0.475303	1.514168
0.477713	1.51376
0.480135	1.513356
0.482569	1.512955
0.485016	1.512558
0.487475	1.512164
0.489947	1.511773
0.492431	1.511386
0.494927	1.511001
0.497437	1.51062
0.499959	1.510242
0.502494	1.509868
0.505041	1.509496
0.507602	1.509127
0.510175	1.508761
0.512762	1.508398
0.515362	1.508037
0.517975	1.50768
0.520601	1.507325
0.52324	1.506973
0.525893	1.506624
0.52856	1.506277
0.531239	1.505933
0.533933	1.505592
0.53664	1.505253
0.539361	1.504917
0.542095	1.504583
0.544844	1.504251
0.547606	1.503922
0.550383	1.503596
0.553173	1.503272
0.555978	1.50295
0.558796	1.50263
0.56163	1.502313
0.564477	1.501999
0.567339	1.501686
0.570216	1.501376
0.573107	1.501068
0.576012	1.500762
0.578933	1.500458
0.581868	1.500157
0.584818	1.499858
0.587783	1.499561
0.590763	1.499266
0.593758	1.498973
0.596769	1.498682
0.599794	1.498394
0.602835	1.498107
0.605892	1.497823
0.608964	1.49754
0.612051	1.49726
0.615154	1.496981
0.618273	1.496705
0.621408	1.49643
0.624559	1.496158
0.627725	1.495887
0.630908	1.495619
0.634107	1.495352
0.637321	1.495088
0.640553	1.494825
0.6438	1.494564
0.647065	1.494305
0.650345	1.494048
0.653642	1.493793
0.656957	1.493539
0.660287	1.493288
0.663635	1.493038
0.667	1.49279
0.670381	1.492544
0.67378	1.4923
0.677196	1.492057
0.68063	1.491817
0.684081	1.491578
0.687549	1.491341
0.691035	1.491105
0.694539	1.490872
0.69806	1.49064
0.701599	1.49041
0.705156	1.490181
0.708732	1.489954
0.712325	1.489729
0.715936	1.489506
0.719566	1.489284
0.723214	1.489064
0.726881	1.488846
0.730567	1.488629
0.734271	1.488414
0.737993	1.488201
0.741735	1.487989
0.745496	1.487779
0.749275	1.48757
0.753074	1.487363
0.756892	1.487158
0.76073	1.486954
0.764587	1.486752
0.768463	1.486551
0.77236	1.486352
0.776276	1.486154
0.780211	1.485958
0.784167	1.485764
0.788143	1.485571
0.792139	1.485379
0.796155	1.485189
0.800192	1.485001
0.804249	1.484814
0.808326	1.484628
0.812424	1.484444
0.816543	1.484261
0.820683	1.48408
0.824844	1.4839
0.829026	1.483722
0.83323	1.483545
0.837454	1.48337
0.8417	1.483196
0.845968	1.483023
0.850257	1.482852
0.854568	1.482682
0.8589	1.482514
0.863255	1.482347
0.867632	1.482181
0.872031	1.482016
0.876452	1.481853
0.880896	1.481692
0.885362	1.481531
0.889851	1.481372
0.894362	1.481214
0.898897	1.481058
0.903454	1.480903
0.908035	1.480749
0.912639	1.480596
0.917266	1.480445
0.921916	1.480294
0.926591	1.480146
0.931288	1.479998
0.93601	1.479852
0.940756	1.479706
0.945525	1.479562
0.950319	1.47942
0.955138	1.479278
0.95998	1.479138
0.964847	1.478999
0.969739	1.478861
0.974656	1.478724
0.979597	1.478588
0.984564	1.478454
0.989556	1.47832
0.994573	1.478188
0.999616	1.478057
1.00468	1.477927
1.00978	1.477798
1.0149	1.47767
1.02004	1.477544
1.02521	1.477418
1.03041	1.477294
1.03564	1.47717
1.04089	1.477048
1.04616	1.476927
1.05147	1.476807
1.0568	1.476687
1.06216	1.476569
1.06754	1.476452
1.07296	1.476336
1.0784	1.476221
1.08386	1.476107
1.08936	1.475994
1.09488	1.475882
1.10043	1.475771
1.10601	1.475661
1.11162	1.475551
1.11726	1.475443
1.12292	1.475336
1.12861	1.47523
1.13434	1.475124
1.14009	1.47502
1.14587	1.474917
1.15168	1.474814
1.15752	1.474712
1.16338	1.474612
1.16928	1.474512
1.17521	1.474413
1.18117	1.474315
1.18716	1.474218
1.19318	1.474121
1.19923	1.474026
1.20531	1.473931
1.21142	1.473838
1.21756	1.473745
1.22373	1.473653
1.22994	1.473561
1.23617	1.473471
1.24244	1.473381
1.24874	1.473293
1.25507	1.473205
1.26143	1.473118
1.26783	1.473031
1.27426	1.472946
1.28072	1.472861
1.28721	1.472777
1.29374	1.472693
1.3003	1.472611
1.30689	1.472529
1.31352	1.472448
1.32018	1.472368
1.32687	1.472288
1.3336	1.47221
1.34036	1.472132
1.34715	1.472054
1.35398	1.471978
1.36085	1.471902
1.36775	1.471826
1.37468	1.471752
1.38165	1.471678
1.38866	1.471605
1.3957	1.471532
1.40277	1.47146
1.40989	1.471389
1.41704	1.471319
1.42422	1.471249
1.43144	1.47118
1.4387	1.471111
1.44599	1.471043
1.45332	1.470976
1.46069	1.470909
1.4681	1.470843
1.47554	1.470778
1.48302	1.470713
1.49054	1.470649
1.4981	1.470585
1.50569	1.470522
1.51333	1.47046
1.521	1.470398
1.52871	1.470337
1.53646	1.470276
1.54425	1.470216
1.55208	1.470156
1.55995	1.470097
1.56786	1.470039
1.57581	1.469981
1.5838	1.469924
1.59183	1.469867
1.5999	1.469811
1.60801	1.469755
1.61616	1.4697
1.62436	1.469645
1.63259	1.469591
1.64087	1.469537
1.64919	1.469484
1.65755	1.469432
1.66596	1.46938
1.6744	1.469328
1.68289	1.469277
1.69142	1.469226
1.7	1.469176

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: —

C₈H₁₀ (Xylene): all datasets

About C8H10 (Xylene)

Xylene (C₈H₁₀) is a volatile organic compound consisting of a benzene ring with two methyl groups (-CH₃) attached. It is typically found as a clear, colorless liquid possessing a sweet, aromatic odor reminiscent of gasoline. Xylene is primarily used as a solvent in the printing, rubber, and leather industries and is also a key ingredient in the production of polyethylene terephthalate (PET) plastics and polyester fibers. In optical applications, xylene's unique refractive properties may make it useful for specific purposes. However, xylene is known to be a potent neurotoxin and exposure can lead to significant health risks, necessitating stringent safety measures during use and handling.

More about C8H10 (Xylene) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C8H10 - xylene/nk/Li.yml
ID: ds_91e0c0c282bc
API: /v1/datasets/ds_91e0c0c282bc

Plot