X-Ray Data Booklet

Section 1.8а ENERGY LEVELS OF FEW-ELECTRON IONIC SPECIES

James H. Scofield

Table 1-4 presents ionization energies for selected few-electron ions with 6 г Z г 54.аTable 1-5 gives the energies of the resonant 2p transitions in hydrogen- and heliumlike ions. The energy values in this section have been generated using the relativistic Hartree-Fock code of I. P. Grant and collaborators [1] with a correction term of the form A + B /(Z Ц Q ) added to bring about agreement with the experimental values known for low atomic numbers.аNuclear size effects, radiative corrections, and the Breit interaction accounting for retardation and the magnetic electron-electron interaction are included in the calculations.аThe hydrogenic values are uncorrected as they come from the code, but to the accuracy given here, they agree with more detailed calculations.аThe values in Table 1-4 for Co-, Ni-, and Cu-like ions are based on data from C. E. Moore [2], J. Sugar and A. Musgrove [3], and others referenced therein. A PDF version of these tables is also available.

REFERENCES

1.аааааI. P. Grant, B. J. McKenzie, P. H. Norrington, D. F. Mayers, and N. C. Pyper, УAn Atomic Multiconfigurational Dirac-Fock Package,Ф Comput. Phys. Commun . 21 , 207 (1980).

2.аааааC. E. Moore, Ionization Potentials and Ionization Limits Derived from the Analysis of Optical Spectra, NBS Pub. NSRDS-NBS 34 (1970).

3.аааааJ. Sugar and A. Musgrove, УEnergy Levels of Zinc, Zn I through Zn XXX,Ф J. Phys. Chem. Ref. Data 24 , 1803 (1995).

Table 1-4.ааа Ionization energies, in electron volts, for selected few-electron ionic species.а Each column is labeled with the number of electrons in the ion before ionization and with the symbol for the neutral atom with the same numberа of electrons.

Element	1 (H)	2 (He)	3 (Li)	4 (Be)	10 (Ne)	11 (Na)	12 (Mg)	27 (Co)	28 (Ni)	29 (Cu)
6 C	490.0	392.1	64.49	47.89
7 N	667.1	552.1	97.89	77.48
8 O	871.4	739.3	138.11	113.90		`
9 F	1103.1	953.9	185.18	157.15
10 Ne	1362.2	1195.8	239.09	207.26	21.564
11 Na	1648.7	1465.1	299.86	264.21	47.286	5.139
12 Mg	1962.7	1761.8	367.5	328.0	80.143	15.035	7.646
13 Al	2304.2	2086.0	442.0	398.7	119.99	28.447	18.828
14 Si	2673.2	2437.7	523.4	476.3	166.42	45.12	33.64
15 P	3070	2816.9	611.7	560.8	220.31	65.02	51.50
16 S	3494	3224	707.0	652.1	281.00	88.05	72.59
17 Cl	3946	3658	809.2	750.5	348.5	114.20	96.84
18 Ar	4426	4121	918.4	855.8	422.8	143.46	124.24
19 K	4934	4611	1034.6	968.0	503.9	175.82	154.75
20 Ca	5470	5129	1157.7	1087.3	591.9	211.28	188.38
21 Sc	6034	5675	1288.0	1213.6	686.6	249.84	225.13
22 Ti	6626	6249	1425.3	1346.9	788.2	291.50	264.98
23 V	7246	6851	1569.7	1487.3	896.6	336.3	307.9
24 Cr	7895	7482	1721.2	1634.8	1011.8	384.2	354.0
25 Mn	8572	8141	1879.9	1789.5	1133.8	435.2	403.2
26 Fe	9278	8828	2045.8	1951.3	1262.7	489.3	455.6
27 Co	10012	9544	2218.9	2120.4	1398.3	546.6	511.0	7.86
28 Ni	10775	10289	2399.3	2296.7	1540.8	607.0	569.7	18.17	7.63
29 Cu	11568	11063	2587.0	2480.2	1690.2	670.6	631.4	36.83	20.29	7.73
30 Zn	12389	11865	2782.0	2671.1	1846.4	737.3	696.4	59.57	39.72	17.96
31 Ga	13239	12696	2984.4	2869.4	2009.4	807.3	764.5	86.0	63.4	30.7
32 Ge	14119	13557	3194	3075	2179.3	880.4	835.8	115.9	90.5	45.72
33 As	15029	14448	3412	3288	2356.0	956.8	910.3	149.2	121.2	62.3
34 Se	15968	15367	3637	3509	2539.6	1036.3	988.1	185.5	155.4	81.7
35 Br	16937	16317	3869	3737	2730.1	1119.1	1069.1	225.4	192.8	103.0
36а Kr	17936	17296	4109	3973	2927.4	1205.2	1153.3	268.2	233.4	125.9
37 Rb	18965	18306	4357	4216	3132	1294.5	1240.8	314.2	277.1	150.7
38 Sr	20025	19345	4612	4467	3343	1387.2	1331.5	363.3	324.1	177.3
39 Y	21115	20415	4876	4726	3561	1483.1	1425.6	413.6	374.0	205.9
40 Zr	22237	21516	5147	4993	3786	1582.4	1523.0	471	427.4	236.2
41 Nb	23389	22648	5426	5268	4017	1684.9	1623.7	530	483.8	268.5
42 Mo	24572	23810	5713	5550	4256	1790.9	1727.8	592	541.7	302.6
43 Tc	25787	25004	6008	5841	4502	1900.3	1835.2	656	605.8	338.5
44 Ru	27033	26230	6312	6140	4754	2013.0	1946.1	724	671.4	376.3
45 Rh	28312	27487	6623	6447	5014	2129.2	2060.3	795	740.1	416.0
46 Pd	29623	28776	6943	6762	5280	2248.9	2178.0	869	811.8	457.5
47 Ag	30966	30097	7271	7086	5553	2372.0	2299.2	946	886.6	500.9
48 Cd	32341	31451	7608	7418	5834	2498.6	2423.9	1026	964.5	546.2
49 In	33750