Optical constants

Refractive index of RbCl (Rubidium chloride)

Li 1976: n 0.18–40 µm

Data: formula 1
Range: 0.18–40 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.49186
Extinction coefficient k: 0

Permittivity ε₁: 2.22564
Permittivity ε₂: 0

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

Abbe number V_d: 45.265
Chromatic dispersion dn/dλ: -0.055198 µm⁻¹

Group index n_g: 1.52429
Group velocity dispersion: 109.096 fs²/mm

Dispersion parameter D: -595.179 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

# RbCl (Rubidium chloride): Li 1976: n 0.18–40 µm
rbcl = ls.fetch_refractiveindex("main", "RbCl", "Li", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(rbcl.range_nm)  # (180, 40000) nm
eps = rbcl.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_3e2d7ef3dfe0/lightsmith"
rbcl = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(rbcl.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (rbcl/li-1976).

# ... load rbcl as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=rbcl)],
    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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_3e2d7ef3dfe0/lightsmith?model=drude_lorentz"
rbcl_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

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

Sellmeier (formula 1), λ in µm

n^{2} - 1 = 0.47558 + \frac{0.56 λ^{2}}{λ^{2} - {0.138}^{2}} + \frac{0.14493 λ^{2}}{λ^{2} - {0.166}^{2}} + \frac{2.74 λ^{2}}{λ^{2} - {85.84}^{2}}

Valid from 0.18 to 40.0 µm.

Coefficients as stored

C_i	Value
C1	0.47558
C2	0.56
C3	0.138
C4	0.14493
C5	0.166
C6	2.74
C7	85.84

Comments and conditions

297 K (24 °C).

References

H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. J. Phys. Chem. Ref. Data 5, 329-528 (1976) and references therein.
* Sellmeier formula is derived by critical analysis of experimental data from several sources.

doi:10.1063/1.555536 Refractive index of alkali halides and its wavelength and temperature derivatives, Journal of Physical and Chemical Reference Data (1976)

Cite

H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. Journal of Physical and Chemical Reference Data, 5, 329-528 (1976), doi:10.1063/1.555536; 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

RbCl (Rubidium chloride), Li 1976: n 0.18–40 µm: n and k versus wavelength
λ (µm)	n
0.18	1.950244
0.182454	1.904119
0.184942	1.866752
0.187464	1.835581
0.19002	1.809006
0.192611	1.785964
0.195237	1.765719
0.197899	1.747738
0.200598	1.731626
0.203333	1.717081
0.206105	1.70387
0.208916	1.691803
0.211764	1.680732
0.214652	1.67053
0.217578	1.661097
0.220545	1.652346
0.223552	1.644204
0.226601	1.636608
0.22969	1.629506
0.232822	1.622851
0.235997	1.616602
0.239215	1.610724
0.242476	1.605185
0.245783	1.599959
0.249134	1.595019
0.252531	1.590344
0.255974	1.585915
0.259464	1.581713
0.263002	1.577723
0.266588	1.573929
0.270223	1.57032
0.273908	1.566881
0.277643	1.563604
0.281428	1.560476
0.285266	1.55749
0.289155	1.554637
0.293098	1.551909
0.297094	1.549299
0.301145	1.5468
0.305251	1.544406
0.309414	1.542111
0.313633	1.53991
0.317909	1.537798
0.322244	1.53577
0.326638	1.533823
0.331091	1.531951
0.335606	1.530152
0.340182	1.528422
0.34482	1.526757
0.349522	1.525154
0.354288	1.523611
0.359119	1.522125
0.364015	1.520693
0.368979	1.519312
0.37401	1.517981
0.379109	1.516698
0.384279	1.515459
0.389518	1.514264
0.394829	1.51311
0.400213	1.511997
0.40567	1.510921
0.411201	1.509882
0.416808	1.508877
0.422491	1.507907
0.428252	1.506969
0.434091	1.506062
0.44001	1.505185
0.44601	1.504336
0.452091	1.503516
0.458256	1.502721
0.464504	1.501953
0.470838	1.501209
0.477258	1.500488
0.483765	1.499791
0.490361	1.499115
0.497048	1.498461
0.503825	1.497827
0.510695	1.497213
0.517658	1.496618
0.524716	1.496041
0.531871	1.495482
0.539123	1.49494
0.546474	1.494415
0.553925	1.493905
0.561478	1.493411
0.569134	1.492932
0.576894	1.492467
0.584761	1.492017
0.592734	1.491579
0.600816	1.491155
0.609008	1.490743
0.617312	1.490343
0.625729	1.489955
0.634261	1.489579
0.642909	1.489213
0.651676	1.488859
0.660561	1.488514
0.669568	1.488179
0.678698	1.487855
0.687952	1.487539
0.697332	1.487233
0.706841	1.486935
0.716478	1.486646
0.726248	1.486365
0.73615	1.486092
0.746188	1.485827
0.756362	1.485569
0.766675	1.485319
0.777129	1.485075
0.787725	1.484839
0.798466	1.484609
0.809353	1.484385
0.820389	1.484168
0.831575	1.483956
0.842914	1.483751
0.854407	1.483551
0.866057	1.483357
0.877866	1.483168
0.889836	1.482984
0.901969	1.482805
0.914267	1.482631
0.926734	1.482462
0.93937	1.482298
0.952178	1.482137
0.965161	1.481981
0.978322	1.48183
0.991661	1.481682
1.00518	1.481538
1.01889	1.481398
1.03278	1.481262
1.04686	1.481129
1.06114	1.481
1.07561	1.480874
1.09027	1.480752
1.10514	1.480632
1.12021	1.480516
1.13548	1.480402
1.15096	1.480292
1.16666	1.480184
1.18257	1.480079
1.19869	1.479977
1.21503	1.479877
1.2316	1.47978
1.24839	1.479685
1.26542	1.479592
1.28267	1.479502
1.30016	1.479413
1.31789	1.479327
1.33586	1.479243
1.35407	1.479161
1.37254	1.479081
1.39125	1.479002
1.41022	1.478926
1.42945	1.478851
1.44894	1.478778
1.4687	1.478706
1.48872	1.478636
1.50902	1.478567
1.5296	1.4785
1.55045	1.478434
1.57159	1.47837
1.59302	1.478307
1.61474	1.478245
1.63676	1.478184
1.65908	1.478125
1.6817	1.478066
1.70463	1.478009
1.72787	1.477953
1.75143	1.477897
1.77531	1.477843
1.79952	1.47779
1.82406	1.477737
1.84893	1.477685
1.87414	1.477634
1.89969	1.477584
1.9256	1.477534
1.95185	1.477485
1.97847	1.477437
2.00544	1.477389
2.03279	1.477342
2.0605	1.477295
2.0886	1.477249
2.11708	1.477203
2.14595	1.477158
2.17521	1.477113
2.20486	1.477068
2.23493	1.477024
2.2654	1.47698
2.29629	1.476936
2.3276	1.476892
2.35934	1.476849
2.39151	1.476805
2.42412	1.476762
2.45717	1.476719
2.49067	1.476676
2.52464	1.476633
2.55906	1.47659
2.59395	1.476547
2.62932	1.476504
2.66517	1.476461
2.70151	1.476417
2.73835	1.476374
2.77569	1.47633
2.81353	1.476286
2.8519	1.476242
2.89078	1.476197
2.9302	1.476152
2.97015	1.476107
3.01065	1.476061
3.0517	1.476015
3.09331	1.475968
3.13549	1.475921
3.17824	1.475874
3.22158	1.475825
3.26551	1.475777
3.31003	1.475727
3.35516	1.475677
3.40091	1.475626
3.44729	1.475574
3.49429	1.475522
3.54193	1.475469
3.59023	1.475414
3.63918	1.475359
3.6888	1.475303
3.7391	1.475246
3.79008	1.475188
3.84176	1.475129
3.89415	1.475069
3.94724	1.475007
4.00106	1.474944
4.05562	1.47488
4.11092	1.474815
4.16697	1.474749
4.22379	1.47468
4.28138	1.474611
4.33976	1.47454
4.39893	1.474467
4.45891	1.474393
4.51971	1.474317
4.58134	1.47424
4.64381	1.47416
4.70712	1.474079
4.77131	1.473996
4.83636	1.47391
4.90231	1.473823
4.96915	1.473734
5.03691	1.473642
5.10559	1.473549
5.1752	1.473452
5.24577	1.473354
5.31729	1.473253
5.3898	1.47315
5.46329	1.473044
5.53778	1.472935
5.61329	1.472823
5.68983	1.472709
5.76741	1.472592
5.84605	1.472471
5.92576	1.472348
6.00656	1.472221
6.08846	1.472091
6.17148	1.471957
6.25563	1.47182
6.34092	1.47168
6.42738	1.471535
6.51502	1.471387
6.60385	1.471235
6.6939	1.471079
6.78517	1.470919
6.87769	1.470754
6.97147	1.470585
7.06652	1.470411
7.16288	1.470232
7.26054	1.470049
7.35954	1.469861
7.45989	1.469667
7.56161	1.469469
7.66471	1.469265
7.76922	1.469055
7.87516	1.468839
7.98254	1.468618
8.09138	1.46839
8.20171	1.468157
8.31354	1.467916
8.4269	1.467669
8.5418	1.467416
8.65827	1.467155
8.77632	1.466887
8.89599	1.466611
9.01729	1.466328
9.14024	1.466037
9.26487	1.465737
9.3912	1.465429
9.51925	1.465113
9.64905	1.464788
9.78061	1.464453
9.91397	1.46411
10.0492	1.463756
10.1862	1.463392
10.3251	1.463019
10.4658	1.462634
10.6086	1.462239
10.7532	1.461832
10.8998	1.461414
11.0484	1.460984
11.1991	1.460542
11.3518	1.460087
11.5066	1.459618
11.6635	1.459137
11.8225	1.458642
11.9837	1.458132
12.1471	1.457608
12.3127	1.457068
12.4806	1.456513
12.6508	1.455942
12.8233	1.455355
12.9981	1.45475
13.1754	1.454128
13.355	1.453487
13.5371	1.452828
13.7217	1.452149
13.9088	1.451451
14.0984	1.450732
14.2907	1.449992
14.4855	1.44923
14.683	1.448445
14.8833	1.447637
15.0862	1.446805
15.2919	1.445949
15.5004	1.445067
15.7118	1.444158
15.926	1.443222
16.1431	1.442258
16.3633	1.441265
16.5864	1.440242
16.8125	1.439188
17.0418	1.438101
17.2741	1.436982
17.5097	1.435828
17.7484	1.434639
17.9904	1.433413
18.2357	1.43215
18.4844	1.430847
18.7364	1.429504
18.9919	1.428119
19.2508	1.42669
19.5133	1.425217
19.7794	1.423697
20.0491	1.422129
20.3225	1.420511
20.5996	1.418841
20.8804	1.417118
21.1652	1.415339
21.4537	1.413502
21.7463	1.411606
22.0428	1.409648
22.3433	1.407626
22.648	1.405536
22.9568	1.403378
23.2698	1.401147
23.5871	1.398842
23.9087	1.396459
24.2347	1.393995
24.5652	1.391447
24.9001	1.388811
25.2396	1.386085
25.5838	1.383263
25.9326	1.380342
26.2862	1.377319
26.6446	1.374188
27.0079	1.370945
27.3762	1.367584
27.7495	1.364102
28.1278	1.360492
28.5114	1.356749
28.9001	1.352865
29.2942	1.348836
29.6936	1.344654
30.0985	1.340312
30.5089	1.335801
30.9249	1.331114
31.3466	1.326242
31.774	1.321175
32.2072	1.315904
32.6464	1.310417
33.0915	1.304703
33.5427	1.29875
34.0001	1.292544
34.4637	1.286072
34.9336	1.279318
35.4099	1.272266
35.8927	1.264897
36.3821	1.257193
36.8782	1.249132
37.3811	1.240693
37.8908	1.231849
38.4074	1.222575
38.9311	1.212841
39.4619	1.202614
40	1.19186

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: —

RbCl (Rubidium chloride): all datasets

Li 1976: n 0.18–40 µm n 0.18–40 µm default

About RbCl (Rubidium chloride)

Rubidium chloride (RbCl) is a white crystalline compound composed of rubidium cations (Rb⁺) and chloride anions (Cl^-). It is highly soluble in water, producing a neutral solution. RbCl is commonly used in laboratories, especially in biochemical research as a source of rubidium ions, which have been used in various physiological studies. The compound shares many properties with other alkali metal chlorides, such as high solubility in water and a hygroscopic nature. It also has potential use in some optical and electronic applications. Due to its reactivity, especially with moisture, precautions should be taken when handling and storing this compound.

More about RbCl (Rubidium chloride) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/RbCl/nk/Li.yml
ID: ds_3e2d7ef3dfe0
API: /v1/datasets/ds_3e2d7ef3dfe0

Plot