Fitting Drude-Lindhard parameters for Nb
i ai ωpi γi

1

3.2610E-02

2.140

1.337

2

1.0193E-01

4.389

3.601

3

-1.1240E-01

5.572

5.435

4

-1.3136E-01

10.168

32.136

5

2.0857E-01

10.354

3.127

6

-1.4445E-01

10.530

2.683

7

-1.0136E-01

16.243

6.562

8

1.0574E-01

17.923

7.502

9

1.9101E-01

21.038

5.062

10

-3.3917E-01

32.049

21.388

11

7.8350E-01

40.525

65.986

12

3.8721E-01

50.337

35.393

13

1.7150E-02

52.020

4.959

14

-1.6136E-01

65.283

36.643

15

-2.1750E-02

123.792

73.112

16

3.5455E-04

132.360

10.490

17

8.8157E-04

151.587

2.727

18

3.4486E-04

199.655

1.510

19

-2.0100E-03

199.872

52.284

20

9.8172E-04

296.935

93.557

21

9.3300E-03

394.556

454.478

22

-7.9640E-06

2093.371

356.223

23

-9.3050E-07

2251.248

80.609

24

8.6416E-06

2510.795

229.220

25

2.2944E-05

2902.679

792.551

26

6.9885E-06

3932.849

1354.440



References of fitted experimental data for Nb

Incident photon
energy range (eV)

Fitted optical
constants

Source of data

0.1-40

n, k

J. Weaver et al., Phys. Rev. B 7, 4311 (1973)

40-50

n

Interpolation

40-50

k

J. Weaver and C. Olson, Phys. Rev. B 14, 3251 (1976)

50-10000

n, k

B. Henke et al., At. Data Nucl. Data Tables 54, 181 (1993)