Optical constants

Refractive index of CH2Cl2 (Dichloromethane, DCM)

Bertie et al. 1995: n,k 1.54–12.5 µm

Data
tabulated nk
Range
1.538–12.53 µm
Points
1305
Temperature
298 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 1.538–12.53 µm
Refractive index n
1.4107
Extinction coefficient k
0.000240754
Permittivity ε1
1.99007
Permittivity ε2
0.000679263
Absorption coefficient α
6.89158 cm⁻¹
Penetration depth δ = λ/(2πk)
2.90209e+06 nm
Abbe number Vd
—
Chromatic dispersion dn/dλ
0 µm⁻¹
Group index ng
1.4107
Group velocity dispersion
— fs²/mm
Dispersion parameter D
— ps/(nm·km)
Photon energy
0.282424 eV

ε = (n + ik)², α = 4πk/λ, ng = 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): Bertie et al. 1995: n,k 1.54–12.5 µm
ch2cl2 = ls.fetch_refractiveindex("organic", "dichloromethane", "Bertie", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ch2cl2.range_nm)  # (1538.5, 12525.3) nm
eps = ch2cl2.eps([4390])  # complex permittivity

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

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

Conditions

temperature
298 K

References

J. E. Bertie, Z. Lan, R. N. Jones, Y. Apelblat. Infrared intensities of liquids XVIII: Accurate optical constants and molar absorption coefficients between 6500 and 800 cm-1 of dichloromethane at 25°C, from spectra recorded in several laboratories. Appl. Spectrosc. 49, 840 (1995)
  • doi:10.1366/0003702953964435 Infrared Intensities of Liquids XVIII: Accurate Optical Constants and Molar Absorption Coefficients between 6500 and 800 cm <sup>−1</sup> of Dichloromethane at 25°C, from Spectra Recorded in Several Laboratories, Applied Spectroscopy (1995)

Cite

John E. Bertie, Zhida Lan, R. Norman Jones and Yoram Apelblat. Infrared Intensities of Liquids XVIII: Accurate Optical Constants and Molar Absorption Coefficients between 6500 and 800 cm <sup>−1</sup> of Dichloromethane at 25°C, from Spectra Recorded in Several Laboratories. Applied Spectroscopy, 49, 840-851 (1995), doi:10.1366/0003702953964435; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

1305 rows as published
CH2Cl2 (Dichloromethane, DCM), Bertie et al. 1995: n,k 1.54–12.5 µm: n and k versus wavelength
λ (µm)nk
1.53851.41250.0
1.54211.41251.2e-06
1.54581.41251e-06
1.54951.41251.5e-06
1.55321.41251.2e-06
1.5571.41258e-07
1.56071.41258e-07
1.56451.41251.2e-06
1.56831.41254e-07
1.57211.41252e-06
1.57591.41259e-07
1.57971.41252e-07
1.58361.41251.4e-06
1.58751.41253.7e-06
1.59141.41257e-07
1.59531.41253e-07
1.59921.41255e-07
1.60321.41252e-07
1.60711.41251e-06
1.61111.41251e-07
1.61521.41251.1e-06
1.61921.41255e-07
1.62321.41252.7e-06
1.62731.41245.6e-06
1.63141.41246.8e-06
1.63551.41241.14e-05
1.63971.41241.98e-05
1.64381.41244.51e-05
1.6481.41240.000121
1.65221.41258.91e-05
1.65641.41253.61e-05
1.66071.41252.07e-05
1.66491.41241.65e-05
1.66921.41241.95e-05
1.67351.41243.01e-05
1.67791.41234.89e-05
1.68221.41230.0001022
1.68661.41230.0002252
1.6911.41240.0002678
1.69541.41250.0002739
1.69991.41260.0001808
1.70431.41269.88e-05
1.70881.41257.96e-05
1.711.41258.64e-05
1.71111.41250.0001002
1.71221.41250.0001231
1.71341.41250.0001451
1.71451.41260.0001422
1.71561.41260.0001207
1.71681.41269.65e-05
1.71791.41267.59e-05
1.7191.41266.14e-05
1.72131.41264.54e-05
1.72361.41264.22e-05
1.72591.41253.77e-05
1.72821.41252.78e-05
1.73051.41252.01e-05
1.73281.41251.28e-05
1.73511.41259.9e-06
1.73751.41259e-06
1.73981.41257.6e-06
1.74211.41255.4e-06
1.74451.41254e-06
1.74681.41253.5e-06
1.74921.41253.5e-06
1.75151.41253.1e-06
1.75391.41253.4e-06
1.75631.41253.1e-06
1.75871.41253.1e-06
1.76111.41253.1e-06
1.76351.41254.1e-06
1.76591.41255.8e-06
1.76831.41255e-06
1.77071.41254.2e-06
1.77311.41243.7e-06
1.77551.41243.5e-06
1.7781.41243.7e-06
1.78041.41244e-06
1.78291.41244.4e-06
1.78531.41245.3e-06
1.78781.41246.3e-06
1.79031.41245.5e-06
1.79271.41244.9e-06
1.79521.41244.8e-06
1.79771.41245.3e-06
1.80021.41246.6e-06
1.80271.41247.8e-06
1.80521.41247.5e-06
1.80771.41246.7e-06
1.81031.41246.9e-06
1.81281.41248.4e-06
1.81531.41241.17e-05
1.81791.41241.29e-05
1.82041.41241.03e-05
1.8231.41248.6e-06
1.82551.41247.9e-06
1.82811.41248.1e-06
1.83071.41249.3e-06
1.83331.41241.23e-05
1.83591.41241.85e-05
1.83851.41242.58e-05
1.84111.41242.42e-05
1.84371.41241.68e-05
1.84631.41241.17e-05
1.8491.41249.3e-06
1.85161.41248.3e-06
1.85431.41248.7e-06
1.85691.41248.8e-06
1.85961.41247.7e-06
1.86231.41246.7e-06
1.86491.41246.2e-06
1.86761.41246.5e-06
1.87031.41247.8e-06
1.8731.41241.02e-05
1.87571.41241.16e-05
1.87851.41241e-05
1.88121.41248e-06
1.88391.41237.1e-06
1.88671.41237.4e-06
1.88941.41239.3e-06
1.89221.41231.57e-05
1.89491.41232.78e-05
1.89771.41232.36e-05
1.90051.41241.54e-05
1.90331.41231.02e-05
1.90611.41237.3e-06
1.90891.41235.9e-06
1.91171.41235.6e-06
1.91451.41235.7e-06
1.91731.41236.1e-06
1.92021.41238.1e-06
1.9231.41231.16e-05
1.92591.41238.9e-06
1.92881.41235.8e-06
1.93161.41234.8e-06
1.93451.41234.8e-06
1.93741.41236.3e-06
1.94031.41237.2e-06
1.94321.41235.8e-06
1.94611.41234.7e-06
1.94911.41234.3e-06
1.9521.41234.4e-06
1.95491.41234.6e-06
1.95791.41235.4e-06
1.96081.41236.5e-06
1.96381.41238.2e-06
1.96681.41239.2e-06
1.96981.41237.5e-06
1.97281.41235.7e-06
1.97581.41234.7e-06
1.97881.41234.5e-06
1.98181.41235.2e-06
1.98491.41236.2e-06
1.98791.41239.9e-06
1.9911.41231.28e-05
1.9941.41237.5e-06
1.99711.41234.8e-06
2.00021.41233.6e-06
2.00331.41222.9e-06
2.00641.41222.7e-06
2.00951.41222.6e-06
2.01261.41223e-06
2.01571.41224e-06
2.01891.41224.4e-06
2.0221.41223.4e-06
2.02521.41222.9e-06
2.02831.41222.9e-06
2.03151.41223.1e-06
2.03471.41223.5e-06
2.03791.41224.9e-06
2.04111.41226.8e-06
2.04431.41225.8e-06
2.04761.41224.3e-06
2.05081.41223.6e-06
2.05411.41223.7e-06
2.05731.41224.6e-06
2.06061.41226.7e-06
2.06391.41228.3e-06
2.06721.41221.37e-05
2.07051.41221.92e-05
2.07381.41221.47e-05
2.07711.41229.9e-06
2.08041.41227.4e-06
2.08381.41226.8e-06
2.08711.41217.2e-06
2.09051.41217.7e-06
2.09391.41218.8e-06
2.09731.41211.38e-05
2.10071.41211.52e-05
2.10411.41219.7e-06
2.10751.41217e-06
2.11091.41215.8e-06
2.11441.41215.2e-06
2.11781.41215.2e-06
2.12131.41215.9e-06
2.12481.41216.2e-06
2.12821.41216e-06
2.13171.41216.1e-06
2.13531.41216.5e-06
2.13881.41216.7e-06
2.14231.41217.1e-06
2.14591.4128.2e-06
2.14941.4121.09e-05
2.1531.4121.29e-05
2.15661.4121.1e-05
2.16021.4129.5e-06
2.16381.4129.3e-06
2.16741.4129.9e-06
2.1711.4121.1e-05
2.17471.4121.36e-05
2.17831.4121.9e-05
2.1821.41192.2e-05
2.18571.41192.52e-05
2.18931.41192.84e-05
2.19311.41193.31e-05
2.19681.41193.78e-05
2.20051.41194.61e-05
2.20421.41185.43e-05
2.2081.41186.58e-05
2.21181.41187.46e-05
2.21551.41188.17e-05
2.21931.41179.45e-05
2.22311.41170.000113
2.2271.41160.000146
2.23081.41150.000203
2.23461.41130.000308
2.23851.41110.000558
2.24241.41090.001334
2.24621.41220.002234
2.25011.41310.001156
2.25411.41290.00055
2.2581.41270.000304
2.26191.41260.000198
2.26591.41250.000151
2.26981.41240.000124
2.27381.41230.000104
2.27781.41238.4e-05
2.28181.41237.1e-05
2.28591.41226.1e-05
2.28991.41225.58e-05
2.29391.41225.32e-05
2.2981.41215.32e-05
2.30211.41215.27e-05
2.30621.41215.43e-05
2.31031.41215.65e-05
2.31441.4126.12e-05
2.31861.4126.53e-05
2.32271.4126.98e-05
2.32691.4127.29e-05
2.33111.41197.79e-05
2.33531.41199e-05
2.33951.41180.0001145
2.34371.41180.0001753
2.3481.41170.0003552
2.35221.4120.000496
2.35651.41210.0002714
2.36081.4120.000197
2.36511.41190.000199
2.36941.41180.000236
2.37381.41170.00035
2.37811.41160.000694
2.38251.4120.001213
2.38691.41270.000792
2.39131.41260.000369
2.39571.41250.000201
2.40011.41240.00013
2.40461.41239.7e-05
2.4091.41237.7e-05
2.41351.41226.5e-05
2.4181.41225.9e-05
2.42251.41225e-05
2.42711.41224.1e-05
2.43161.41213.6e-05
2.43621.41213.19e-05
2.44081.41212.91e-05
2.44541.41212.56e-05
2.451.41212.46e-05
2.45471.4122.46e-05
2.45931.4122.51e-05
2.4641.4122.57e-05
2.46871.4122.65e-05
2.47341.4122.78e-05
2.47811.4122.99e-05
2.48291.41193.31e-05
2.48761.41193.79e-05
2.49241.41194.4e-05
2.49721.41194.91e-05
2.5021.41195.46e-05
2.50691.41196.33e-05
2.51171.41187.57e-05
2.51291.41187.93e-05
2.51421.41188.34e-05
2.51541.41188.82e-05
2.51661.41189.34e-05
2.51781.41189.91e-05
2.51911.41180.0001061
2.52031.41180.0001146
2.52151.41180.0001241
2.52271.41170.0001361
2.5241.41170.0001511
2.52521.41170.00017
2.52641.41170.000194
2.52761.41170.0002262
2.52891.41170.0002685
2.53011.41170.0003238
2.53131.41170.0003938
2.53261.41170.0004755
2.53381.41180.0005536
2.53511.41190.0006
2.53631.4120.0005922
2.53751.41210.0005353
2.53881.41220.0004565
2.541.41220.000379
2.54131.41220.0003125
2.54251.41220.0002579
2.54381.41220.0002146
2.5451.41220.0001806
2.54631.41210.0001549
2.54751.41210.0001353
2.54881.41210.0001198
2.551.41210.0001071
2.55131.41219.66e-05
2.55251.41218.8e-05
2.55381.4128.09e-05
2.5551.4127.51e-05
2.55631.4127.04e-05
2.55761.4126.63e-05
2.55881.4126.3e-05
2.56011.4126.04e-05
2.56141.4125.79e-05
2.56261.4125.59e-05
2.56391.4125.49e-05
2.56521.4125.36e-05
2.56641.4125.25e-05
2.56771.4125.19e-05
2.5691.41195.21e-05
2.57021.41195.2e-05
2.57151.41195.25e-05
2.57281.41195.38e-05
2.57411.41195.57e-05
2.57541.41195.76e-05
2.57661.41196.04e-05
2.57791.41196.31e-05
2.57921.41196.3e-05
2.58051.41196.02e-05
2.58181.41195.67e-05
2.5831.41195.29e-05
2.58431.41194.95e-05
2.58561.41194.7e-05
2.58691.41194.51e-05
2.58821.41194.37e-05
2.58951.41194.21e-05
2.59081.41194.14e-05
2.59211.41194.1e-05
2.59341.41194.07e-05
2.59471.41194e-05
2.5961.41194.08e-05
2.59731.41194.14e-05
2.59861.41194.18e-05
2.59991.41184.25e-05
2.60121.41184.36e-05
2.60251.41184.51e-05
2.60381.41184.67e-05
2.60511.41184.9e-05
2.60641.41185.22e-05
2.60771.41185.56e-05
2.6091.41186.02e-05
2.61041.41186.52e-05
2.61171.41187e-05
2.6131.41187.31e-05
2.61431.41187.33e-05
2.61561.41187.07e-05
2.61691.41186.66e-05
2.61831.41186.3e-05
2.61961.41185.97e-05
2.62091.41185.74e-05
2.62221.41185.62e-05
2.62361.41185.58e-05
2.62491.41185.58e-05
2.62621.41185.63e-05
2.62751.41185.73e-05
2.62891.41185.79e-05
2.63021.41185.88e-05
2.63151.41186.03e-05
2.63291.41186.11e-05
2.63421.41186.22e-05
2.63561.41186.34e-05
2.63691.41186.46e-05
2.63821.41176.61e-05
2.63961.41176.77e-05
2.64091.41176.96e-05
2.64361.41177.49e-05
2.64631.41178.31e-05
2.6491.41179.62e-05
2.65171.41170.0001176
2.65441.41160.0001532
2.65721.41160.0002066
2.65991.41170.0002609
2.66261.41180.0002691
2.66541.41180.0002276
2.66811.41180.0001814
2.67091.41180.0001546
2.67361.41180.0001502
2.67641.41180.0001621
2.67911.41180.000177
2.68191.41180.0001819
2.68471.41180.0001734
2.68751.41180.0001561
2.69031.41180.0001432
2.6931.41170.0001398
2.69581.41170.0001508
2.69871.41170.000177
2.70151.41170.0002164
2.70431.41170.0002674
2.70711.41180.0003139
2.70991.41190.0003148
2.71281.41190.0002569
2.71561.41190.0001866
2.71851.41190.000133
2.72131.41199.8e-05
2.72421.41197.62e-05
2.7271.41196.01e-05
2.72991.41185e-05
2.73281.41184.17e-05
2.73571.41183.6e-05
2.73861.41183.17e-05
2.74151.41182.78e-05
2.74441.41182.56e-05
2.74731.41182.26e-05
2.75021.41182.15e-05
2.75311.41171.98e-05
2.7561.41171.9e-05
2.7591.41171.84e-05
2.76191.41171.72e-05
2.76481.41171.81e-05
2.76781.41171.79e-05
2.77081.41171.98e-05
2.77371.41172.16e-05
2.77671.41172.27e-05
2.77971.41172.3e-05
2.78271.41172.03e-05
2.78561.41171.94e-05
2.78861.41171.76e-05
2.79161.41161.74e-05
2.79461.41161.76e-05
2.79771.41161.77e-05
2.80071.41161.94e-05
2.80371.41162e-05
2.80681.41162.21e-05
2.80981.41162.24e-05
2.81281.41162.34e-05
2.81591.41162.46e-05
2.8191.41162.5e-05
2.8221.41162.64e-05
2.82511.41162.61e-05
2.82821.41162.82e-05
2.83131.41162.81e-05
2.83441.41162.6e-05
2.83751.41162.22e-05
2.84061.41161.89e-05
2.84371.41151.65e-05
2.84681.41151.51e-05
2.84991.41151.4e-05
2.85311.41151.35e-05
2.85621.41151.3e-05
2.85941.41151.3e-05
2.86251.41151.29e-05
2.86571.41151.28e-05
2.86891.41151.29e-05
2.8721.41151.28e-05
2.87521.41151.18e-05
2.87841.41151.12e-05
2.88161.41151.06e-05
2.88481.41151.03e-05
2.8881.41141.09e-05
2.89131.41141.23e-05
2.89451.41141.21e-05
2.89771.41141.45e-05
2.9011.41141.86e-05
2.90421.41142.28e-05
2.90751.41142.43e-05
2.91071.41142.51e-05
2.9141.41142.5e-05
2.91731.41142.42e-05
2.92061.41142.28e-05
2.92391.41142.2e-05
2.92721.41141.8e-05
2.93051.41141.62e-05
2.93381.41131.53e-05
2.93711.41131.42e-05
2.94041.41131.31e-05
2.94381.41131.41e-05
2.94711.41131.39e-05
2.95051.41131.49e-05
2.95381.41131.64e-05
2.95721.41131.91e-05
2.96061.41132.29e-05
2.9641.41122.61e-05
2.96741.41123.05e-05
2.97081.41123.21e-05
2.97421.41123.4e-05
2.97761.41123.52e-05
2.9811.41123.56e-05
2.98441.41123.42e-05
2.98791.41123.37e-05
2.99131.41123.43e-05
2.99481.41123.56e-05
2.99821.41123.59e-05
3.00171.41113.72e-05
3.00521.41113.89e-05
3.00871.41114.19e-05
3.01221.41114.49e-05
3.01571.41114.86e-05
3.01921.41115.32e-05
3.02271.41115.75e-05
3.02621.41116.19e-05
3.02981.4116.78e-05
3.03331.4117.11e-05
3.03691.4117.38e-05
3.04041.4117.52e-05
3.0441.4117.87e-05
3.04761.4118.24e-05
3.05121.4118.88e-05
3.05481.4119.47e-05
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8.1791.42160.002324
8.18541.42110.002263
8.19191.42070.002225
8.19841.42030.002189
8.20491.41990.002141
8.21141.41950.002106
8.21791.41910.002065
8.22441.41880.001998
8.23091.41840.00191
8.25711.41720.001698
8.28351.41590.001484
8.311.41480.001379
8.33671.41380.001314
8.36361.4130.001276
8.39071.41220.001216
8.41791.41140.001221
8.44541.41070.001206
8.4731.41010.001227
8.50071.40950.001266
8.52871.40890.00133
8.55691.40840.001425
8.58521.4080.001554
8.61371.40760.001702
8.64241.40740.001804
8.67131.40730.001756
8.70041.40710.001579
8.72971.40680.001372
8.75921.40640.001192
8.78891.4060.001049
8.81881.40560.000925
8.84891.40520.000823
8.87921.40480.000742
8.90971.40440.000676
8.94051.4040.00062
8.97141.40360.000571
9.00251.40330.000528
9.03391.40290.000491
9.06551.40250.000458
9.09731.40210.000429
9.12931.40180.000403
9.16161.40140.00038
9.19411.4010.000363
9.22681.40060.00035
9.25981.40030.0003287
9.2931.39990.0003135
9.32641.39950.0003025
9.36011.39910.0002934
9.3941.39870.0002862
9.42811.39840.0002816
9.46251.3980.000279
9.49721.39760.0002792
9.53211.39710.0002829
9.56731.39670.0002903
9.60271.39630.0003052
9.63841.39590.0003306
9.67441.39540.0003655
9.71061.3950.0004128
9.74711.39460.0004677
9.78391.39420.000509
9.8211.39380.0005109
9.85831.39340.0004848
9.8961.39290.0004599
9.93391.39240.0004561
9.97211.39180.0004846
10.01061.39130.0005585
10.04941.39070.0007074
10.08851.39030.0008882
10.12791.38990.0009611
10.16761.38950.0009486
10.20761.38910.0008594
10.2481.38850.000749
10.28871.38790.0006742
10.32971.38720.0006423
10.3711.38660.000635
10.41261.38580.0006391
10.45461.38510.0006491
10.49691.38440.0006756
10.51821.3840.000693
10.53961.38360.000716
10.56111.38320.000737
10.58261.38270.00076
10.60431.38230.000787
10.6261.38190.000815
10.64781.38140.000849
10.66971.3810.000887
10.69171.38050.000926
10.71381.380.000973
10.7361.37950.001028
10.75831.3790.001081
10.78061.37840.001147
10.80311.37790.001224
10.82571.37730.001311
10.84831.37670.001408
10.8711.3760.001524
10.89381.37540.00166
10.91681.37460.00182
10.93981.37390.00202
10.96291.3730.00227
10.98621.37210.0026
11.00951.3710.00306
11.03291.36990.00373
11.05641.36850.00476
11.08011.36710.00641
11.10381.3660.00917
11.12761.36630.01348
11.15151.37060.01768
11.17561.37720.0168
11.19971.38030.01219
11.2241.380.00821
11.24831.37860.00572
11.27281.37710.00427
11.29741.37570.0033
11.32211.37440.002554
11.34681.3730.002033
11.37171.37180.001681
11.39671.37060.001435
11.42181.36940.001253
11.4471.36830.001115
11.47241.36720.001015
11.49781.36610.000946
11.52331.3650.000898
11.5491.36390.000858
11.57481.36280.000832
11.60071.36170.000813
11.62671.36050.000802
11.6791.35820.0008
11.73181.35580.000816
11.78511.35320.000862
11.8391.35050.000953
11.89331.34760.000997
11.94811.34450.001058
12.00341.34110.001163
12.05921.33740.001305
12.11561.33350.001465
12.17241.3290.00167
12.22991.32420.002005
12.28781.31890.002414
12.34631.31290.002978
12.40541.30620.003821
12.46511.2990.004858
12.52531.2910.00608

Optical transmission calculator

Free-standing sample in vacuum, normal incidence
Method
Transmittance T
—
Reflectance R
—

Fresnel reflection calculator

Direction
Rp
—
Rs
—
R = (Rp+Rs)/2
—
Phase φp
—
Phase φs
—
Brewster angle θB
—
Critical angle θC
—