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The spectrum of trebly ionized argon, A IV
Physica III, no. 8
Augustus 1936
THE SPECTRUl\I OF TREBLY IONIZED ARGON, A IV by T. L. DE BRUIN Laboratory "Physica", University of.Arnsterdarn
The spectra and their structure of the neutral Argon atom, A II) the singly ionized Atom A II 2) and the doubly ionized atom, A III 3) are known to a certain extent. Not much however is known about the spectrum of the trebly ionized atom A IV. Only an investigation of the extreme ultra violet region has been published by Boy C e 4). Boy c e has identified the deep terms belonging to the S2p3 and s p4 configurations. This paper deals with the main terms and muItiplets belonging to the middle group of terms arising from the addition of a 4s- and 4pelectron to the core in the 3p and 1D state.
Experimental procedure. In this investigation a light source has been used of nearly the same constitution as in the previous experiments concerning the A III spectrum. The analysis of the A IV spectrum is now possible because a complete separation between the A III and A IV lines has been obtained. The regulation of a selfinduction in the coil makes this possible. The A IV spectrum has been photographed with a 2 m and 3 m grating and in the ultra violet with a Hi 1 g erE I quartz spectrograph. Photographs have already been published in the Pie t e r Z e e man Jubilee Volume (Nijhoff, The Hague, 1935). Theoretical considerations. According to theory the configurations S2. p2. 4s and S2. p2 4p should give the following terms, together 29 levels *). S2.p 2As limit 3po 0 0 0 •• 4P321 2P21 limit ID 0 • 0 0 2D32 limit 15.0.0.0 25 1 4D 4321 4p 321 452 2D 32 2p 21 25 J S2.p2.4p II'mI't 3P. 0 0 0 limit 1Do. 0 0 0 0 2F43 2D32 2P21 limit 150.0.00 2P21 0
O'
O'
*)
J. values increased with i.
-
809-
-
' co o
TABLE I
Te rmtable Argon IV
s'p' s/"
'5. ,J\
'1'. '1';
0 117564 118515 119044
95 1 529
'D. 'D, 'D. 'D,
21219 21090
129
146000 145921
79
'1'. .,p~
35035 34854
181
21>2
166356 16744 4 177833
1088
'1',
'5,
Limit 'P
s'p· . 4s 5'1" • 4p
' I',
'1', 'P, 'D, '1.'. 'D, '1." ,
'1'. '1',
'1', '5,
251972.00 250906.60 250219 .15
1065.40 68 7. 15
287555.83 286751. 68 286228.80 285960.17
801. 15 522.8 8 26 8.63
289834. 68 289237. 82 289125. 88
596.86 111.94
29 1748.70
;l
Limit 'D
'1', '1',
257348.89 250693.29
1255. 60
'D. 'D,
291667.73 290256.45
1411.28
'1';
' [' .
295805.77 295674 .54
'5.
299563.20
131.23
'D, 'D,
'F, 'F. 'D. 'D. '1', '1',
268151.3 8 268171.3 8 3 043 99 . 9~
304074.29 30623 6.28 306308.25
.... ....
20.00
Limit '5
r
'5,. .. .
trl t::l
o
;;:J
c..... 325.61 71.97
'1',. . ..
'1', ... .
z
THE SPECTRUlII OF TREBLY
roxrzzn
ARGOX, A 1\'
811
Terms and. niultipleis. The newly discovered terms, arising from the addition of a 4s- and 4p-electron to the core in the 3p and ID state and the multiplets in which they occur are given in the tables I, II, III and IV. A number of 50 A IV lines has been identified. For convenience, Boy c e's deep terms belonging to the extreme ultra violet, are included in the table of terms. Intercombinations between the quartet and doublet terms have been discovered; all the terms have therefore, the same scale. TABLE II
I I
I I
251972.00
I
I 250906.60
I
I 250219.45
45 'p.
I
I
I
I
4p'D,
16 2809.44 35583.83
4P'D 3
6 2374.40 34779.68
286228.80
4P'D.
3 2918.28 34256.76
285960.17
4p 'D,
287555.83
286751.68
289834.68
4p
4p
289237.82
289125.88
291748.70
4P
I
4p
'P 3
15 2640.34 37862.64
.p.
9 2682.63 37265.80
'5.
I
291667.73
4p 'D 3
6 2518.40 39695.80
290256.45
4p 'D.
3 2611.24 38284.56
45 'P,
1065.43
14 2788.96 35845.11
1065.44
10 2830.25 35322.20
686.85
10 2776.26 36009.07
4 2851.94 35053.57
687.11
7 2797.11 35740.68
1065.47
10 2568.07 38923.11
1065.44
10 2608.06 38331.24
686.43
12 2562.17 39018.72
12 2615.68 38219.28
686.69
7 2569.53 38905.97
687.25
6 2407.20 41529.39
'P, 12 2513.28 39776.67
45 'p.
11065.471
8 2447.71 40842.14
1065.25
4 2452.58 40761.05
1065.18
4 2540.55 39349.74
I
687.37
I
3 2496.93 40037.11
812
T. L. DE BRUIN
TABLE III 257348.89
256093.29
45 'P,
45 'P,
4p 'D.
12 2913.00 34318.84
4p 'D,
6 3037.98 32907.06
295805.77
295674.54
291667.73
290256.45
299563.20
1255.46
11 2926.33 34162.52
4p 'P,
12 2599.47 38457.90
1255.57
5 2517.28 39713.47
4p 'P,
7 2608.44 38325.66
1255.58
9 2525.69 39581.24
'5,
3 2368.15 42214.14
1256.00
4 2299.72 43470.14
1255.49
5 3016.15 33145.22
4p
289834.68
4p
.p.
8 3077.40 32485.55
289237.82
4p
-r,
3 3134.90 31889.73
289125.88
4p 'P,
31776.99
33032.59
TABLE IV 268151.38
268171.38
45 'D.
45'D,
4p 'F.
14 2757.92 36248.52
4p 'F.
3 2782.92 35922.91
20.00
12 2784.47 35902.91
4p 'D.
12 2624.92 38085.05
20.30
2 2626.32 38064.75
4p 'D,
6 2619.98 38156.68
20.09
12 2621.36 38136.77
THE SPECTRU)I OF TREBLY IO~IZED ARGO~, A IV
813
Comparison with isoclectronic configurations. The A IV spectrum belongs to the isoelectronic sequence: P 1 5), 5 II 6), Ct. III 7), A IV, J{ V 8), Ca. VI 9) ..• " All these spectra have now been analysed to a certain extent and a comparison of some analogous terms and term differences is possible. The irregular and regular doublet laws hold fairly well. For comparison we only give a little table V concerning the 4s-terms. It should be noticed that the Ct. III termdifferences show an anomalous bellaviour. TABLE V
z 15 16 17 18 19 20
I P 5
I II
III IV tc V Ca VI
CI A
-r.;
I
EI.
249.1 437.0 520.1 1065.5 1527 2106
I
-r;
I
151.2 270.8 357.8 687.0 1017 1437
'p..
297.6 524.1 706.4 1255.5 1800 2467
I
2V 3 2
0 1.56 58 20.0 40 67
I
45 "P. 56340 110268 174614 251972 339172 437392
I
45
'D.
65157 121530 188390 268151 356993 457458
Table VI contains the 4s and 4p term separations as calculated according to the method of G 0 u d s mit and Hum p h r e y s 10). In most cases the agreement is fairly good. The greatest deviation appears in 4p 4P21 and 4p 2P2 1. This discrepancy occurs however also in the other isoelcctronic configurations. TABLE VI" A IV
45 IP., 4P!1
'p.. 4p IDu 'D., "D ..
4p -P3., Ip"
4p 3D•• 2P f !
I
calc.
1072 1285 643 749 535 321 535 321 1072 643
I
obs.
1065 1256 687 804 523 269 597 112 1411 132
In conclusion, the writer wishes to express his appreciation to Professor P. Z e e man for his interest during this investigation. Received June 9,1936.
814 T . L. DE BRUI"", TIlE
SPECTHU~I OF TREBLY IO~IZED ARGON. A IV
REFEREXCES I) K. W. :II e iss n e r, Z. Phys. a7, 238, 1926; 3!I, 172, 1926; ''.0 . 839, 1927; W. G rem mer, Z. Phys, ;;0, 721,1928; E. R a s m u sse n, Z. Phys, 7;;. 695, 1932; w. F. :lleggers and c. OJ. Humphreys, J. Res. Bur. Stand. 10,427, 1933; j. C. Boy c e, Phys. nev, '-'8, 396, 1935. ° 2) T. L. deB r u in, Proc, roy. Acad, Amsterdam, 31, 771, 1928; 198, 1930; Versl, kon, Akad. Amsterdam, 3, 340,1928; Z. Phys., '-'8, 62,1928; 51, lOS, 1928; 61,307, 1930; K. T. Com p ton, j. C. Boy c e, H. X. R u sse II, Phys. Rev, 32,179, 1928; j. C. Boy c e, Phys. Rev., '-'S, 396, 1935. 3) V. yon Keussi -cr, Z.Phys.S'o,42,1933;T.L. de Bruin, Proe.roy.Acad. Amsterdam, :16, 7, 724, 1933; T. L. de Dr u i n, Pieter Zeeman jubilee Volume (Xijho£l, The Hague, 1935),413; j. C. Do Y c e, Phys, Rev. '-'S, 396, 1935. 4) j.C. Boyce, PhysvRev. .-.a,396,193S. 5) H. A. Rob ins 0 n, Phys, Rev. '-'9, 297, 1936. 6) S. B. I n g ram, Phys, Rey. 3~, 173, 1928. 7) I. 13 0 wen, Phys, Rev. 4;;, 401. 1934. 8) 1. 13 0 wen, Phys, Rev. '-'6, 791. 1934. 9) 1. Dow c n, Phys, Rev. '-'6, 791, 1934. 10) S. Goudsmit and C. }, Humphreys, Phys.Rev.:1I;960,1923.
Augustus 1936
THE SPECTRUl\I OF TREBLY IONIZED ARGON, A IV by T. L. DE BRUIN Laboratory "Physica", University of.Arnsterdarn
The spectra and their structure of the neutral Argon atom, A II) the singly ionized Atom A II 2) and the doubly ionized atom, A III 3) are known to a certain extent. Not much however is known about the spectrum of the trebly ionized atom A IV. Only an investigation of the extreme ultra violet region has been published by Boy C e 4). Boy c e has identified the deep terms belonging to the S2p3 and s p4 configurations. This paper deals with the main terms and muItiplets belonging to the middle group of terms arising from the addition of a 4s- and 4pelectron to the core in the 3p and 1D state.
Experimental procedure. In this investigation a light source has been used of nearly the same constitution as in the previous experiments concerning the A III spectrum. The analysis of the A IV spectrum is now possible because a complete separation between the A III and A IV lines has been obtained. The regulation of a selfinduction in the coil makes this possible. The A IV spectrum has been photographed with a 2 m and 3 m grating and in the ultra violet with a Hi 1 g erE I quartz spectrograph. Photographs have already been published in the Pie t e r Z e e man Jubilee Volume (Nijhoff, The Hague, 1935). Theoretical considerations. According to theory the configurations S2. p2. 4s and S2. p2 4p should give the following terms, together 29 levels *). S2.p 2As limit 3po 0 0 0 •• 4P321 2P21 limit ID 0 • 0 0 2D32 limit 15.0.0.0 25 1 4D 4321 4p 321 452 2D 32 2p 21 25 J S2.p2.4p II'mI't 3P. 0 0 0 limit 1Do. 0 0 0 0 2F43 2D32 2P21 limit 150.0.00 2P21 0
O'
O'
*)
J. values increased with i.
-
809-
-
' co o
TABLE I
Te rmtable Argon IV
s'p' s/"
'5. ,J\
'1'. '1';
0 117564 118515 119044
95 1 529
'D. 'D, 'D. 'D,
21219 21090
129
146000 145921
79
'1'. .,p~
35035 34854
181
21>2
166356 16744 4 177833
1088
'1',
'5,
Limit 'P
s'p· . 4s 5'1" • 4p
' I',
'1', 'P, 'D, '1.'. 'D, '1." ,
'1'. '1',
'1', '5,
251972.00 250906.60 250219 .15
1065.40 68 7. 15
287555.83 286751. 68 286228.80 285960.17
801. 15 522.8 8 26 8.63
289834. 68 289237. 82 289125. 88
596.86 111.94
29 1748.70
;l
Limit 'D
'1', '1',
257348.89 250693.29
1255. 60
'D. 'D,
291667.73 290256.45
1411.28
'1';
' [' .
295805.77 295674 .54
'5.
299563.20
131.23
'D, 'D,
'F, 'F. 'D. 'D. '1', '1',
268151.3 8 268171.3 8 3 043 99 . 9~
304074.29 30623 6.28 306308.25
.... ....
20.00
Limit '5
r
'5,. .. .
trl t::l
o
;;:J
c..... 325.61 71.97
'1',. . ..
'1', ... .
z
THE SPECTRUlII OF TREBLY
roxrzzn
ARGOX, A 1\'
811
Terms and. niultipleis. The newly discovered terms, arising from the addition of a 4s- and 4p-electron to the core in the 3p and ID state and the multiplets in which they occur are given in the tables I, II, III and IV. A number of 50 A IV lines has been identified. For convenience, Boy c e's deep terms belonging to the extreme ultra violet, are included in the table of terms. Intercombinations between the quartet and doublet terms have been discovered; all the terms have therefore, the same scale. TABLE II
I I
I I
251972.00
I
I 250906.60
I
I 250219.45
45 'p.
I
I
I
I
4p'D,
16 2809.44 35583.83
4P'D 3
6 2374.40 34779.68
286228.80
4P'D.
3 2918.28 34256.76
285960.17
4p 'D,
287555.83
286751.68
289834.68
4p
4p
289237.82
289125.88
291748.70
4P
I
4p
'P 3
15 2640.34 37862.64
.p.
9 2682.63 37265.80
'5.
I
291667.73
4p 'D 3
6 2518.40 39695.80
290256.45
4p 'D.
3 2611.24 38284.56
45 'P,
1065.43
14 2788.96 35845.11
1065.44
10 2830.25 35322.20
686.85
10 2776.26 36009.07
4 2851.94 35053.57
687.11
7 2797.11 35740.68
1065.47
10 2568.07 38923.11
1065.44
10 2608.06 38331.24
686.43
12 2562.17 39018.72
12 2615.68 38219.28
686.69
7 2569.53 38905.97
687.25
6 2407.20 41529.39
'P, 12 2513.28 39776.67
45 'p.
11065.471
8 2447.71 40842.14
1065.25
4 2452.58 40761.05
1065.18
4 2540.55 39349.74
I
687.37
I
3 2496.93 40037.11
812
T. L. DE BRUIN
TABLE III 257348.89
256093.29
45 'P,
45 'P,
4p 'D.
12 2913.00 34318.84
4p 'D,
6 3037.98 32907.06
295805.77
295674.54
291667.73
290256.45
299563.20
1255.46
11 2926.33 34162.52
4p 'P,
12 2599.47 38457.90
1255.57
5 2517.28 39713.47
4p 'P,
7 2608.44 38325.66
1255.58
9 2525.69 39581.24
'5,
3 2368.15 42214.14
1256.00
4 2299.72 43470.14
1255.49
5 3016.15 33145.22
4p
289834.68
4p
.p.
8 3077.40 32485.55
289237.82
4p
-r,
3 3134.90 31889.73
289125.88
4p 'P,
31776.99
33032.59
TABLE IV 268151.38
268171.38
45 'D.
45'D,
4p 'F.
14 2757.92 36248.52
4p 'F.
3 2782.92 35922.91
20.00
12 2784.47 35902.91
4p 'D.
12 2624.92 38085.05
20.30
2 2626.32 38064.75
4p 'D,
6 2619.98 38156.68
20.09
12 2621.36 38136.77
THE SPECTRU)I OF TREBLY IO~IZED ARGO~, A IV
813
Comparison with isoclectronic configurations. The A IV spectrum belongs to the isoelectronic sequence: P 1 5), 5 II 6), Ct. III 7), A IV, J{ V 8), Ca. VI 9) ..• " All these spectra have now been analysed to a certain extent and a comparison of some analogous terms and term differences is possible. The irregular and regular doublet laws hold fairly well. For comparison we only give a little table V concerning the 4s-terms. It should be noticed that the Ct. III termdifferences show an anomalous bellaviour. TABLE V
z 15 16 17 18 19 20
I P 5
I II
III IV tc V Ca VI
CI A
-r.;
I
EI.
249.1 437.0 520.1 1065.5 1527 2106
I
-r;
I
151.2 270.8 357.8 687.0 1017 1437
'p..
297.6 524.1 706.4 1255.5 1800 2467
I
2V 3 2
0 1.56 58 20.0 40 67
I
45 "P. 56340 110268 174614 251972 339172 437392
I
45
'D.
65157 121530 188390 268151 356993 457458
Table VI contains the 4s and 4p term separations as calculated according to the method of G 0 u d s mit and Hum p h r e y s 10). In most cases the agreement is fairly good. The greatest deviation appears in 4p 4P21 and 4p 2P2 1. This discrepancy occurs however also in the other isoelcctronic configurations. TABLE VI" A IV
45 IP., 4P!1
'p.. 4p IDu 'D., "D ..
4p -P3., Ip"
4p 3D•• 2P f !
I
calc.
1072 1285 643 749 535 321 535 321 1072 643
I
obs.
1065 1256 687 804 523 269 597 112 1411 132
In conclusion, the writer wishes to express his appreciation to Professor P. Z e e man for his interest during this investigation. Received June 9,1936.
814 T . L. DE BRUI"", TIlE
SPECTHU~I OF TREBLY IO~IZED ARGON. A IV
REFEREXCES I) K. W. :II e iss n e r, Z. Phys. a7, 238, 1926; 3!I, 172, 1926; ''.0 . 839, 1927; W. G rem mer, Z. Phys, ;;0, 721,1928; E. R a s m u sse n, Z. Phys, 7;;. 695, 1932; w. F. :lleggers and c. OJ. Humphreys, J. Res. Bur. Stand. 10,427, 1933; j. C. Boy c e, Phys. nev, '-'8, 396, 1935. ° 2) T. L. deB r u in, Proc, roy. Acad, Amsterdam, 31, 771, 1928; 198, 1930; Versl, kon, Akad. Amsterdam, 3, 340,1928; Z. Phys., '-'8, 62,1928; 51, lOS, 1928; 61,307, 1930; K. T. Com p ton, j. C. Boy c e, H. X. R u sse II, Phys. Rev, 32,179, 1928; j. C. Boy c e, Phys. Rev., '-'S, 396, 1935. 3) V. yon Keussi -cr, Z.Phys.S'o,42,1933;T.L. de Bruin, Proe.roy.Acad. Amsterdam, :16, 7, 724, 1933; T. L. de Dr u i n, Pieter Zeeman jubilee Volume (Xijho£l, The Hague, 1935),413; j. C. Do Y c e, Phys, Rev. '-'S, 396, 1935. 4) j.C. Boyce, PhysvRev. .-.a,396,193S. 5) H. A. Rob ins 0 n, Phys, Rev. '-'9, 297, 1936. 6) S. B. I n g ram, Phys, Rey. 3~, 173, 1928. 7) I. 13 0 wen, Phys, Rev. 4;;, 401. 1934. 8) 1. 13 0 wen, Phys, Rev. '-'6, 791. 1934. 9) 1. Dow c n, Phys, Rev. '-'6, 791, 1934. 10) S. Goudsmit and C. }, Humphreys, Phys.Rev.:1I;960,1923.