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Table 2
Transition rates A(RCI) in units of s-1 for E1 transitions in Fe XXI for upper levels 6−20.
| Upper | Lower | E(RCI) | λ (nm) | A(RCI) | R | A(FAC) | A(NIST) |
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| 6 | 2 | 412 720 | 24.229488 | 3.603E+07 | 0.93 | 3.418E+07 | 3.6E+07 |
| 6 | 3 | 369 167 | 27.087986 | 3.275E+07 | 0.91 | 3.190E+07 | 3.5E+07 |
| 6 | 4 | 241 833 | 41.350807 | 1.309E+06 | 0.85 | 1.238E+06 | |
| 7 | 1 | 776 775 | 12.873736 | 1.157E+10 | 1.00 | 1.167E+10 | 1.2E+10 |
| 7 | 2 | 702 911 | 14.226540 | 7.598E+08 | 1.01 | 8.035E+08 | 7.9E+08 |
| 7 | 3 | 659 358 | 15.166251 | 8.347E+07 | 0.95 | 7.380E+07 | 7.3E+07 |
| 7 | 4 | 532 024 | 18.796122 | 1.809E+08 | 0.94 | 1.797E+08 | 2.0E+08 |
| 7 | 5 | 404 638 | 24.713440 | 4.071E+07 | 0.97 | 4.207E+07 | 5.5E+07 |
| 8 | 2 | 703 540 | 14.213828 | 9.241E+09 | 0.99 | 9.395E+09 | 1.0E+10 |
| 8 | 3 | 659 987 | 15.151805 | 4.587E+06 | 0.83 | 3.220E+06 | 1.3E+07 |
| 8 | 4 | 532 653 | 18.773939 | 3.824E+07 | 0.95 | 3.697E+07 | 3.8E+07 |
| 9 | 3 | 686 201 | 14.572988 | 6.104E+09 | 0.99 | 6.268E+09 | 6.6E+09 |
| 9 | 4 | 558 866 | 17.893346 | 9.772E+08 | 0.97 | 9.501E+08 | 1.0E+09 |
| 10 | 2 | 842 580 | 11.868298 | 2.200E+10 | 1.00 | 2.252E+10 | 2.41E+10 |
| 11 | 1 | 925 073 | 10.809949 | 4.213E+09 | 1.00 | 4.361E+09 | 4.28E+09 |
| 11 | 2 | 851 210 | 11.747982 | 1.602E+10 | 1.00 | 1.608E+10 | 1.71E+10 |
| 11 | 3 | 807 657 | 12.381491 | 2.680E+09 | 1.01 | 2.879E+09 | 3.2E+09 |
| 11 | 4 | 680 323 | 14.698899 | 2.577E+08 | 1.02 | 2.700E+08 | 3.0E+08 |
| 11 | 5 | 552 936 | 18.085257 | 1.492E+08 | 0.94 | 1.490E+08 | 1.6E+08 |
| 12 | 2 | 868 757 | 11.510688 | 3.815E+08 | 0.98 | 4.295E+08 | |
| 12 | 3 | 825 204 | 12.118202 | 2.039E+10 | 1.00 | 2.065E+10 | 2.17E+10 |
| 12 | 4 | 697 870 | 14.329300 | 1.434E+08 | 1.04 | 1.616E+08 | 2.4E+08 |
| 13 | 1 | 1 096 019 | 9.123926 | 9.457E+09 | 1.00 | 9.684E+09 | 9.9E+09 |
| 13 | 2 | 1 022 155 | 9.783245 | 2.532E+10 | 1.00 | 2.586E+10 | 2.64E+10 |
| 13 | 3 | 978 602 | 10.218650 | 6.103E+10 | 1.00 | 6.172E+10 | 6.4E+10 |
| 13 | 4 | 851 268 | 11.747171 | 3.610E+08 | 0.98 | 3.134E+08 | 3.0E+08 |
| 13 | 5 | 723 882 | 13.814401 | 6.512E+08 | 0.98 | 6.176E+08 | 6.9E+08 |
| 14 | 2 | 1 053 808 | 9.489392 | 3.911E+08 | 1.01 | 3.827E+08 | 4.2E+08 |
| 14 | 3 | 1 010 255 | 9.898487 | 8.022E+09 | 1.00 | 7.925E+09 | 8.8E+09 |
| 14 | 4 | 882 921 | 11.326038 | 4.483E+10 | 1.00 | 4.565E+10 | 4.8E+10 |
| 15 | 1 | 1 261 577 | 7.926585 | 2.857E+07 | 0.98 | 2.375E+07 | |
| 15 | 2 | 1 187 713 | 8.419538 | 4.910E+09 | 1.00 | 4.842E+09 | 5.3E+09 |
| 15 | 3 | 1 144 160 | 8.740030 | 2.498E+08 | 0.99 | 2.470E+08 | 2.3E+08 |
| 15 | 4 | 1 016 826 | 9.834518 | 6.584E+10 | 1.00 | 6.703E+10 | 7.1E+10 |
| 15 | 5 | 889 440 | 11.243027 | 1.726E+10 | 1.00 | 1.741E+10 | 1.83E+10 |
| 16 | 6 | 1 159 853 | 8.621779 | 1.423E+09 | 1.02 | 1.348E+09 | 1.4E+09 |
| 16 | 7 | 869 662 | 11.498720 | 3.456E+09 | 1.01 | 3.418E+09 | 3.78E+09 |
| 16 | 8 | 869 033 | 11.507038 | 1.335E+10 | 1.00 | 1.354E+10 | 1.47E+10 |
| 16 | 9 | 842 819 | 11.864934 | 2.821E+10 | 0.99 | 2.892E+10 | 3.09E+10 |
| 16 | 11 | 721 363 | 13.862635 | 3.677E+09 | 1.00 | 3.703E+09 | 3.83E+09 |
| 16 | 12 | 703 815 | 14.208262 | 3.626E+09 | 0.99 | 3.616E+09 | 3.67E+09 |
| 16 | 13 | 550 417 | 18.168014 | 6.004E+09 | 0.99 | 6.228E+09 | 6.8E+09 |
| 16 | 14 | 518 765 | 19.276536 | 7.538E+08 | 0.98 | 7.473E+08 | 8.5E+08 |
| 16 | 15 | 384 859 | 25.983478 | 8.411E+07 | 0.97 | 8.806E+07 | 1.1E+08 |
| 17 | 7 | 959 047 | 10.427012 | 3.473E+10 | 1.00 | 3.555E+10 | 3.73E+10 |
| 17 | 11 | 810 749 | 12.334272 | 1.826E+10 | 0.99 | 1.866E+10 | 2.04E+10 |
| 17 | 13 | 639 803 | 15.629801 | 1.733E+10 | 1.00 | 1.758E+10 | 1.93E+10 |
| 17 | 15 | 474 245 | 21.086127 | 9.923E+06 | 0.84 | ||
| 18 | 6 | 1 254 038 | 7.974236 | 2.382E+08 | 1.03 | 2.361E+08 | 2.8E+08 |
| 18 | 7 | 963 847 | 10.375088 | 1.433E+10 | 1.00 | 1.471E+10 | 1.56E+10 |
| 18 | 8 | 963 218 | 10.381859 | 2.123E+10 | 1.00 | 2.186E+10 | 2.27E+10 |
| 18 | 10 | 824 178 | 12.133301 | 4.810E+09 | 1.00 | 4.856E+09 | 5.1E+09 |
| 18 | 11 | 815 548 | 12.261682 | 1.281E+08 | 1.02 | 1.074E+08 | 1.5E+08 |
| 18 | 12 | 798 001 | 12.531311 | 1.598E+10 | 0.99 | 1.619E+10 | 1.77E+10 |
| 18 | 13 | 644 603 | 15.513422 | 1.290E+10 | 1.00 | 1.324E+10 | 1.4E+10 |
| 18 | 14 | 612 950 | 16.314528 | 3.771E+08 | 0.97 | 3.487E+08 | 3.6E+08 |
| 18 | 15 | 479 045 | 20.874858 | 6.389E+08 | 0.99 | 6.361E+08 | 7.4E+08 |
| 19 | 6 | 1 331 202 | 7.512005 | 5.286E+07 | 1.02 | 4.679E+07 | |
| 19 | 7 | 1 041 011 | 9.606046 | 4.029E+06 | 1.21 | 5.556E+06 | |
| 19 | 8 | 1 040 382 | 9.611850 | 7.874E+08 | 1.00 | 7.573E+08 | 7.2E+08 |
| 19 | 9 | 1 014 168 | 9.860292 | 5.624E+09 | 1.01 | 5.435E+09 | 5.9E+09 |
| 19 | 11 | 892 712 | 11.201813 | 1.242E+09 | 1.02 | 1.181E+09 | 1.3E+09 |
| 19 | 12 | 875 164 | 11.426418 | 2.516E+09 | 1.01 | 2.363E+09 | 2.5E+09 |
| 19 | 13 | 721 766 | 13.854888 | 6.999E+06 | 1.00 | 6.809E+06 | |
| 19 | 14 | 690 114 | 14.490350 | 3.181E+10 | 1.00 | 3.274E+10 | 3.56E+10 |
| 19 | 15 | 556 209 | 17.978853 | 4.497E+09 | 0.99 | 4.559E+09 | 5.0E+09 |
| 20 | 7 | 1 271 736 | 7.863266 | 2.329E+08 | 0.99 | 2.083E+08 | |
| 20 | 11 | 1 123 437 | 8.901249 | 4.222E+09 | 1.01 | 4.034E+09 | 4.5E+09 |
| 20 | 13 | 952 492 | 10.498774 | 5.110E+09 | 1.00 | 5.272E+09 | 5.8E+09 |
| 20 | 15 | 786 934 | 12.707543 | 7.547E+10 | 1.00 | 7.752E+10 | 8.4E+10 |
Notes. Rates are based on computed transition energies and length gauge has been used. R is the ratio between transition rates in length and velocity gauge. The index for the upper and lower states are the ones given in Table 1. For comparison rates from Landi & Gu (2006), (A(FAC)), and NIST Atomic Spectra Database (2013), (A(NIST)), are included.
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