Table 1 Measured resonance centroids and energy positions of the intermediate excited states of even-parity observed in \(\lambda _2\) scans.

From: High efficiency laser resonance ionization of plutonium

Peak #

Centroid (\({\text {cm}}^{-1}\))

\(\lambda _2\) (nm)

E\(_2\) (\({\text {cm}}^{-1}\))

Refs.25,35

E (\({\text {cm}}^{-1}\))

J

1*

11802.75(2)

847.26

35568.73(3)

35568.70(3)

2

2*

12024.67(4)

831.62

35790.65(4)

  

3

12160.72(4)

822.32

35926.70(4)

  

4*

12211.30(4)

818.91

35977.28(4)

  

5

12264.24(4)

815.38

36030.22(4)

  

6

12371.68(4)

808.30

36137.66(4)

36137.60

2

7

12455.62(4)

802.85

36221.60(4)

  

8*

12547.64(4)

796.96

36313.62(4)

  

9

12570.12(4)

795.54

36336.10(4)

  

10

12577.22(2)

795.09

36343.20(3)

36343.05

0

11

12602.38(5)

793.50

36368.36(5)

  

12

12685.63(3)

788.29

36451.61(3)

  

13*

12686.36(3)

788.25

36452.34(3)

  

14

12736.96(3)

785.12

36502.94(3)

36502.88

2

15

12790.12(3)

781.85

36556.10(4)

  

16

12843.84(3)

778.58

36609.82(4)

36609.74

2

17*

12923.51(3)

773.78

36689.49(3)

  

18*

12934.51(3)

773.13

36700.50(3)

  
  1. The last two columns are the energy and J values of the known levels for \(^{242}\)Pu from direct measurement26 and the \(^{240-242}\)Pu isotope shifts36.
  2. Seven \(\lambda _2\) resonances that were clearly visible in the first scan with \(\lambda _3\) = 761.95 nm were chosen as SES for further investigation of three-step schemes, as marked with (*).