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Table 1 Wavelengths, relaxation times, intensities and the involved electronic states of the transitions shown in Fig. 4 are listed [41, 43]

From: Non-invasive assessment of plasma parameters inside an ion thruster combining optical emission spectroscopy and principal component analysis

index

wavelength (nm)

relaxation time (ns)

intensity

lower level

upper level

    

configuration

term

J

configuration

term

J

(1)

820.63

50

700

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6s}\)

2[1/2]∘

0

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6p}\)

2[3/2]

1

(1,1)

3605.49

1700

20

\(5p^{5}(^{2}P^{\circ }_{1/2})6p\)

2[3/2]

1

\(5p^{5}(^{2}P^{\circ }_{1/2})5d\)

2[5/2]∘

2

(2)

823.16

35

10000

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6s}\)

2[3/2]∘

2

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6p}\)

2[3/2]

2

(2,1)

3107.77

1400

6000

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

2

\(5p^{5}(^{2}P^{\circ }_{3/2})5d\)

2[5/2]∘

3

(2,2)

1672.82

556

5000

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

2

\(5p^{5}(^{2}P^{\circ }_{3/2})7s\)

2[3/2]∘

2

(2,3)

739.38

204

150

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

2

\(5p^{5}(^{2}P^{\circ }_{3/2})7d\)

2[5/2]∘

3

(3)

826.65

61.7

500

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6s}\)

2[1/2]∘

1

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6p}\)

2[1/2]

1

(3,1)

4610.87

3700

1

\(5p^{5}(^{2}P^{\circ }_{1/2})6p\)

2[1/2]

1

\(5p^{5}(^{2}P^{\circ }_{1/2})5d\)

2[3/2]∘

2

(4)

828.01

27.1

7000

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6s}\)

2[3/2]∘

1

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6p}\)

2[1/2]

0

(4,1)

1878.82

1100

860

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[1/2]

0

\(5p^{5}(^{2}P^{\circ }_{3/2})7s\)

2[3/2]∘

1

(4,2)

2651.77

6300

30

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[1/2]

0

\(5p^{5}(^{2}P^{\circ }_{3/2})5d\)

2[3/2]∘

1

(5)

834.68

24

2000

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6s}\)

2[1/2]∘

1

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {1}/\boldsymbol {2}})\boldsymbol {6p}\)

2[3/2]

2

(5,1)

3869.68

1900

200

\(5p^{5}(^{2}P^{\circ }_{1/2})6p\)

2[3/2]

2

\(5p^{5}(^{2}P^{\circ }_{1/2})5d\)

2[5/2]∘

3

(6)

840.92

327

2000

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6s}\)

2[3/2]∘

2

\(\boldsymbol {5p}^{\boldsymbol {5}}(^{\boldsymbol {2}}\boldsymbol {P}^{\circ }_{\boldsymbol {3}/\boldsymbol {2}})\boldsymbol {6p}\)

2[3/2]

1

(6,1)

3367.59

1690

3500

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

1

\(5p^{5}(^{2}P^{\circ }_{3/2})5d\)

2[5/2]∘

2

(6,2)

2026.78

417

2300

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

1

\(5p^{5}(^{2}P^{\circ }_{3/2})5d\)

2[3/2]∘

1

(6,3)

1541.8

180

110

\(5p^{5}(^{2}P^{\circ }_{3/2})6p\)

2[3/2]

1

\(5p^{5}(^{2}P^{\circ }_{3/2})7s\)

2[3/2]∘

1

  1. The listed intensities are only the qualitative vf.[41]. Using the index, the transitions can be found in Fig. 4. The observed transitions are shown in bold