Fitting Drude-Lindhard parameters for Er
i ai ωpi γi

1

-5.7020E-02

0.196

5.121

2

8.3410E-02

0.848

3.942

3

-4.0710E-02

1.424

19.691

4

-7.3330E-02

1.660

10.126

5

-4.4180E-04

2.490

0.026

6

6.3930E-02

2.832

7.436

7

-1.3966E-01

2.977

2.995

8

3.2200E-03

3.667

0.003

9

2.1600E-03

4.036

0.047

10

-3.2280E-02

4.199

4.014

11

-6.8100E-03

4.250

0.032

12

-3.4400E-02

4.355

4.778

13

-1.6400E-03

4.420

0.032

14

1.0910E-02

4.520

0.014

15

2.1540E-02

4.581

0.002

16

-2.3600E-03

4.687

0.057

17

6.3600E-03

4.737

0.110

18

-2.2000E-03

4.805

0.067

19

6.8100E-03

4.955

0.019

20

1.1693E-01

5.251

4.192

21

-4.0800E-03

5.337

0.010

22

2.8500E-04

5.343

0.013

23

2.0370E-02

14.071

6.125

24

-8.6680E-02

15.686

12.584

25

2.9240E-02

17.635

7.818

26

-1.4240E-02

24.950

8.361

27

2.7026E-01

27.399

19.108

28

9.9395E-01

28.412

67.675

29

-1.0040E-01

30.631

12.562

30

-1.2280E-02

73.359

18.522

31

1.2840E-02

74.318

18.100

32

-2.3950E-02

88.273

20.972

33

1.8190E-02

89.030

18.416

34

1.0240E-02

166.421

14.649

35

-2.4320E-02

167.992

19.023

36

1.4180E-02

171.596

19.749

37

1.6280E-02

261.796

445.854

38

-5.4992E-05

1097.880

226.791

39

9.6419E-05

1520.530

432.869

40

1.4742E-04

1737.811

1454.865

41

4.7560E-05

2722.379

1692.128

42

2.8900E-07

6796.931

690.000

43

4.9100E-08

6853.514

654.000



References of fitted experimental data for Er

Incident photon
energy range (eV)

Fitted optical
constants

Source of data

0.06-2.5

n, k

Y. Knyazev and M. Noskov, Sov. J. Low Temp. Phys. 4, 376 (1978)

2.5-5.6

n, k

J. Weaver and D. Lynch, Phys. Rev. Lett. 34, 1324 (1975)
Y. Knyazev and G. Bolotin, Phys. Met. Metall. 61, 57 (1986)

5.6-10000

n, k

B. Henke et al., At. Data Nucl. Data Tables 27, 1 (1982)