# Optical constants for Nb created by PTB
# Determined from reflection measurements in the wavelength range 6.0 - 20.4 nm
# 40 nm Nb thin film in a multilayer on Si (Hf/ Nb/ Hf/ Si) (measured 04/2024)
# n = (1-delta) - (i*beta)
# Citation: Q. Saadeh, A. Sokolov, M. Störmer, et al., "Optical constants of Sc, V, Cr, Co, Ni, Nb, Mo, Rh, Pd, Hf, W, Re, Os, Ir, Pt, Au, and ZrO2 in the extreme ultraviolet range," Opt. Express 34(15), 28239-28292 (2026).
# The values are provided with their 3-sigma uncertainty bounds. HB: Higher Bound. LB: Lower Bound.
# lambda/nm	1-delta	beta	1-delta_LB	1-delta_HB	beta_LB	beta_HB
# ------------------------
6.0	0.99555	0.00225	0.99568	0.99541	0.00212	0.00238
6.1	0.99497	0.00226	0.99511	0.99483	0.00214	0.0024
6.2	0.99444	0.00201	0.99456	0.99431	0.0019	0.00213
6.3	0.99374	0.00212	0.99386	0.99361	0.002	0.00223
6.4	0.99316	0.00215	0.99329	0.99303	0.00203	0.00228
6.5	0.99265	0.00222	0.99278	0.99252	0.0021	0.00234
6.6	0.99207	0.00225	0.9922	0.99193	0.00213	0.00237
6.7	0.99161	0.00231	0.99174	0.99148	0.00219	0.00244
6.8	0.99099	0.00239	0.99113	0.99085	0.00227	0.00252
6.9	0.99053	0.00244	0.99066	0.99039	0.00231	0.00256
7.1	0.98944	0.00262	0.98958	0.9893	0.00249	0.00275
7.3	0.98852	0.00283	0.98866	0.98837	0.0027	0.00298
7.5	0.98768	0.00287	0.98782	0.98753	0.00274	0.00301
7.7	0.98676	0.00291	0.9869	0.98662	0.00277	0.00305
7.9	0.98576	0.00291	0.98589	0.98562	0.00279	0.00305
8.1	0.9846	0.00304	0.98474	0.98445	0.00291	0.00318
8.3	0.98354	0.00319	0.98369	0.98338	0.00306	0.00333
8.5	0.98251	0.00334	0.98266	0.98236	0.0032	0.00348
8.7	0.9815	0.00338	0.98165	0.98136	0.00324	0.00352
8.9	0.98044	0.00343	0.98058	0.98029	0.00329	0.00358
9.1	0.97924	0.00349	0.9794	0.97909	0.00335	0.00363
9.3	0.9781	0.00369	0.97826	0.97795	0.00355	0.00383
9.5	0.97709	0.00366	0.97724	0.97694	0.00352	0.0038
9.7	0.97587	0.00361	0.97601	0.97572	0.00347	0.00375
9.9	0.9745	0.00362	0.97463	0.97436	0.00349	0.00374
10.1	0.97313	0.00398	0.97332	0.97293	0.00378	0.00419
10.3	0.97171	0.00378	0.97192	0.9715	0.00361	0.00395
10.5	0.97038	0.00386	0.97057	0.97019	0.00369	0.00406
10.7	0.96904	0.00383	0.96922	0.96884	0.00365	0.00402
10.9	0.96748	0.00381	0.96767	0.96728	0.00364	0.00398
11.1	0.9659	0.00387	0.96608	0.96571	0.00369	0.00406
11.3	0.96432	0.00398	0.96452	0.96412	0.00381	0.00415
12.1	0.95743	0.00429	0.95764	0.95723	0.00413	0.00446
12.3	0.95551	0.00511	0.95572	0.95531	0.0049	0.00534
12.5	0.95401	0.00431	0.95423	0.9538	0.00413	0.0045
12.7	0.95198	0.00455	0.95219	0.95177	0.00437	0.00476
12.9	0.94987	0.0047	0.95008	0.94966	0.00449	0.00491
13.1	0.94784	0.00474	0.94806	0.94761	0.00456	0.00493
13.3	0.94566	0.00485	0.94586	0.94546	0.00462	0.00508
13.5	0.94347	0.005	0.9437	0.94323	0.00481	0.0052
13.7	0.94114	0.00513	0.94135	0.94093	0.0049	0.00536
13.9	0.93864	0.00534	0.93888	0.93841	0.00514	0.00556
14.0	0.93742	0.00532	0.93779	0.93704	0.00502	0.00563
14.2	0.93498	0.0058	0.93532	0.93464	0.00535	0.00626
14.4	0.9322	0.00609	0.93252	0.93187	0.00565	0.00653
14.6	0.9295	0.00639	0.92988	0.92908	0.00609	0.0067
14.8	0.92678	0.00667	0.92715	0.92641	0.00631	0.00703
15.0	0.924	0.00718	0.92438	0.92363	0.00676	0.00764
15.2	0.92117	0.00765	0.92154	0.92077	0.00721	0.00811
15.4	0.9182	0.00823	0.91865	0.91774	0.00786	0.0086
15.6	0.91504	0.00862	0.91545	0.91462	0.00811	0.00912
15.8	0.91188	0.00915	0.91233	0.91144	0.00865	0.00966
16.0	0.90853	0.00994	0.9091	0.90797	0.0095	0.01038
16.2	0.90492	0.01077	0.90546	0.9044	0.01021	0.01133
16.4	0.90116	0.0114	0.90168	0.90062	0.01075	0.01206
16.6	0.8978	0.01243	0.89848	0.89711	0.01187	0.01298
16.8	0.89372	0.01393	0.89443	0.89304	0.01334	0.01454
17.0	0.88961	0.01498	0.89025	0.88894	0.0142	0.01577
17.2	0.88596	0.01646	0.88675	0.88514	0.01574	0.01724
17.4	0.88199	0.01837	0.88285	0.88105	0.01758	0.01919
17.6	0.87788	0.02035	0.87877	0.87696	0.01944	0.02139
17.8	0.87411	0.02218	0.87515	0.87302	0.02118	0.0232
18.0	0.87004	0.02435	0.87129	0.86887	0.02323	0.0255
18.2	0.86582	0.02655	0.86705	0.86447	0.02535	0.02786
18.4	0.86156	0.02879	0.86303	0.86009	0.02751	0.03013
18.6	0.85752	0.03117	0.85926	0.85579	0.02975	0.03268
18.8	0.85351	0.03409	0.85548	0.85158	0.03251	0.03583
19.0	0.84958	0.0368	0.85175	0.84726	0.03507	0.03864
19.2	0.84489	0.03996	0.8474	0.8424	0.03807	0.04193
19.4	0.84045	0.04355	0.84324	0.83779	0.04142	0.04574
19.6	0.83608	0.04691	0.839	0.83309	0.04475	0.0494
19.8	0.83157	0.05072	0.83472	0.82833	0.04833	0.05337
20.0	0.82717	0.05534	0.8307	0.82376	0.05258	0.05814
20.2	0.82272	0.05958	0.82649	0.81901	0.05674	0.06271
20.4	0.81906	0.06484	0.82329	0.81484	0.06148	0.06836