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Table 3

Number of transitions in scandium spectra (first column) available from three sources: NIST database, Kurucz linelist (CD-ROM No. 23) and present calculations with FAC.

NIST E1 transitions Kurucz FAC E1 transitions
obs Ritz only gf gf gA/gAmax gf  e−5   E/I
Ion Totala with gf with gf obs  >10-4  >10-3  >10-5  >10-4
Sc xxib 8 0 0 0 780 732 606 588
Sc xx 37 0 37 0 2549 2194 1350 1493
Sc xix 79 29 47 3 790 754 701 684
Sc xviii 24 16 8 0 21 505 13 999 10 681 9449
Sc xvii 52 21 20 11 72398 39 927 26 906 23 070
Sc xvi 82 34 30 18 171 420 90 024 59 607 49 068
Sc xv 58 28 14 16 216 773 114 497 68 431 61 169
Sc xiv 63 33 21 9 158 608 85 919 49 826 46 103
Sc xiii 39 18 1 20 74 152 43 995 28 290 25 346
Sc xii 68 5 0 63 16 007 11 620 8084 7606
Sc xi 130 31 86 13 763 746 719 714
Sc x 99 25 4 70 20 974 15 774 14 387 11 723
Sc ix 35 15 0 20 95 67 043 43 752 39 634 29 692
Sc viii 46 16 3 27 72 260 142 155 366 143 356 95 592
Sc vii 53 15 5 33 124 408 929 236 975 207 634 133 874
Sc vi 63 0 0 63 119 191 222 112 340 92 957 65 824
Sc v 454 14 0 440 36 104 336 63 866 36 519 35 989
Sc iv 407 4 0 403 1204 19 657 13 802 5921 8691
Sc iii 133 79 18 36 226 735 682 656 615
total 1930 383 294 1245 1876 1 808 783 1 046 964 796 265 607 290

Notes. The total number of dipolar electric transitions found in NIST (second column) is broken down into observed transitions given with gf values (third column), Ritz unobserved transitions with gf values (fourth column), and observed transitions without gf values (fifth column). All transitions listed by Kurucz have gf values (sixth column). The four last columns give the number of transitions calculated in this work and selected according to various criteria: lines with gf values greater than 10-4 and 10-3, lines with weighted transition probability gA greater than 10-5 relative to the maximum value in the ion. Finally (last column), transitions have been selected according to their gf values weighted by a Bolztmann factor e−E/kT, where E is the lower level excitation energy and the energy kT is one fifth of the ionization potential of the ion.

(a)

Excluding 9 transitions in Sc xix and 1 transition in Sc iv from levels above the ionization threshold, and 4 observed lines in Sc vi without level identification.

(b)

NIST contains only theoretical wavelengths for this ion.

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