Table 1 Atomic energy levels (in eV) in Eu0/−.

From: Direct experimental observation of weakly-bound character of the attached electron in europium anion

Band

Binding energy (eV)

Atomic energy level (eV) (this work)

Atomic energy level (eV) (Ref. 43)

Term of final state

X'

0.039

−0.077

—

—

X

0.116

0

0

8 S 7/2

A

1.725

1.609

1.602

10 D 5/2

A1

1.746

1.630

1.618

10 D 7/2

A2

1.773

1.657

1.639

10 D 9/2

A3

1.797

1.681

1.668

10 D 11/2

A4

1.830

1.718

1.708

10 D 13/2

B

1.864

1.748

1.744

10 P 7/2

B1

1.910

1.794

1.806

10 P 9/2

C

1.995

1.879

1.877

8 D 3/2

C1

2.009

1.893

1.891

8 D 5/2

C2

2.024

1.908

1.912

8 D 7/2

B2

2.044

1.928

1.932

10 P 11/2

C3

2.063

1.947

1.944

8 D 9/2

D

2.088

1.972

1.970

8 P 5/2

E

2.261

2.145

2.150

6 P 7/2

  1. Experimental binding energies (BEs) have an uncertainty of ±0.013 eV. The present atomic energy levels are obtained by calculating the energy differences between peak X and other peaks observed in the photoelectron spectrum. The referenced spectroscopic data are obtained from Ref. 43.
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