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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