The Zeeman effect of the neutral arsenic spectrum was observed photographically from 1937 to 11 244 Å. Well-defined Zeeman patterns of 130 As i lines were recorded and yielded 61 Landé g values of which 9 were previously available. The light source was an electrodeless lamp of quartz containing metallic arsenic and helium carrier gas at 3–5 Torr; it was operated in a magnetic field of 24 025 or 10 000 G and excited by a standard microwave generator. Conditions that were favorable for the excitation of the first spectrum of arsenic were noted and characterized. The J and g values obtained from our Zeeman patterns confirmed most of the existing As i analysis but forced reclassification of several terms. There is acceptable agreement between the g values and those calculated from intermediate-coupling wave functions obtained by the least-squares fitting of energy levels for the single configuration approximation to 4s2 4p3 and 4s2 4p2 5s. Also, adequate fits of energy levels could be obtained in the single configuration approximation for each of the 4s2 4p2 5p and 4s2 4p2 6p configurations, but large discrepancies occurred in the g values. Such discrepancies were reduced considerably when configuration interaction was included in the calculations, providing positive evidence of configuration mixing that led to the reclassification of several energy levels and to the addition of some of the missing classifications.
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Designations without prime have the parent levels 3P. Single prime indicates the parent level 1D2.
The number of transitions from which the experimental average was taken.
The number of patterns measured. The number preceding the letter U is the number of unresolved patterns.
Measurements of Green and Barrows (Ref. 2).
TABLE II
Level chances forced by Zeeman analysis of lines indicated
Level (cm−1) present (previous)
Wavelength Å
Zeeman J values g values
Classification present (previous)
Remarks
60 147.5, 5p2S1/2
10 575.0
1/2–1/2
5s4P1/2–5p2S1/2
The former level value 64059 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification.
(64 059.0, 5p2S1/2)
2.581–1.4
(5s2P3/2–5p2S1/2)
62 026.3, 5p4P3/2
9 597.9
3/2–3/2
5s4P3/2–5p4P3/2
The level value 62026 cm−1 is based on three lines. The two listed here give Zeeman patterns and both indicate that the J value of this level is 3/2.
(62 026.3, 5p4P1/2)
1.720–1.570
(5s4P3/2–5p4P1/2)
62 026.3, 5p4P3/2
8 821.7
1/2–3/2
5s4P1/2–p4P3/2
(62 026.3, 5p4P1/2)
2.584–1.570
(5s4P1/2–5p4P1/2)
62 398.0, 5p4P1/2
10 793.4
1/2–1/2
5s2P1/2–5p4P1/2
The level value 62 398 cm−1 is based on three lines. The two listed here give Zeeman patterns and both indicate that the J value of this level is 1/2.
(62 398.0, 5p4P3/2)
0.74–2.50
(5s2P1/2–5p4P3/2)
62 398.0, 5p4P1/2
9 267.2
3/2–1/2
5s4P3/2–5p4P1/2
(62 398.0, 5p4P3/2)
1.720–2.496
(5s4P3/2–5p4P3/2)
69 933.5, 6p4D3/2*
5 196.2
1/2–3/2
5s4P1/2–6p4D3/2
The former level value 70849 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification. * This classification was formerly assigned to 70516.6 entered below.
(70 849.7, 6p4P3/2)
2.59–1.13
(5s4P3/2–6p4P3/2)
69 881.5, 6p4D1/2
Redesignation was based on least-squares calculation.
(69 881.5, 6p4P1/2)
70 516.6, 5p2D3/2
Redesignation was based on least-squares calculation. Note the change of configuration.
(70 516.6, 6p4D3/2)
70 790.9, 6p2S1/2
5 212.1
3/2–1/2
5s4P3/2–6p2S1/2
This new level is supported by two lines and their Zeeman patterns and its level value and g value are in accordance with least-squares predictions.
1.723–1.361
(unclassified)
4 974.8
1/2–1/2
5s4P1/2–6p2S1/2
2.60–1.35
(new line)
71 053.9, 6p4P3/2
5 141.6
3/2–3/2
5s4P3/2–6p4P3/2
The former level value 72341 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification.
(72 341.6, 6p4D7/2)
1.730–1.51
(5s4P5/2–6p4D7/2)
71 199.1, 6p4P1/2
Redesignation was based on least-squares calculation.
(71 199.1, 6p2S1/2)
72 382.7, 6p4D7/2
5 130.8
5/2–7/2
5s4P5/2–6p4D7/2
This line can be doubly classified. The level 72 620.3 cm−1 is supported by three lines, two of them having Zeeman patterns confirming its classification. However, the Zeeman pattern of this line clearly indicates the higher J values. Since the g value of the level 5s4P5/2 is 1.588, it seems probable that this line is the combination indicated to establish the level 6p4D7/2 at a new value of 72 382.7 cm−1. Both the new level value and its g value are in accordance with calculations.
(72 620.3, 6p4S3/2)
1.572–1.414
(5s4P1/2–6p4S3/2)
rejected (70 108.4, 5p2D3/2)
10 780.4
This level was rejected since the only supportine line, 10780 A, was not found even in the long exposures.
rejected (70 274.9, 6p4D1/2)
51 05.6
This line was not found even in long exposures. The classification is therefore rejected.
TABLE III
Comparison of experimental and calculated results for the multiconfigurations 4s24p25p–4s24p26p
The letters preceding the term values have the following meanings: N-new level, R-reclassified, J-J changed, C-configuration changed.
Level designations without prime have the parent levels 3P. Single prime indicates the parent level 1D2. Double prime means a parent level 1S0.
Predicted term value is higher than the ionization limit.
Designations without prime have the parent levels 3P. Single prime indicates the parent level 1D2.
The number of transitions from which the experimental average was taken.
The number of patterns measured. The number preceding the letter U is the number of unresolved patterns.
Measurements of Green and Barrows (Ref. 2).
TABLE II
Level chances forced by Zeeman analysis of lines indicated
Level (cm−1) present (previous)
Wavelength Å
Zeeman J values g values
Classification present (previous)
Remarks
60 147.5, 5p2S1/2
10 575.0
1/2–1/2
5s4P1/2–5p2S1/2
The former level value 64059 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification.
(64 059.0, 5p2S1/2)
2.581–1.4
(5s2P3/2–5p2S1/2)
62 026.3, 5p4P3/2
9 597.9
3/2–3/2
5s4P3/2–5p4P3/2
The level value 62026 cm−1 is based on three lines. The two listed here give Zeeman patterns and both indicate that the J value of this level is 3/2.
(62 026.3, 5p4P1/2)
1.720–1.570
(5s4P3/2–5p4P1/2)
62 026.3, 5p4P3/2
8 821.7
1/2–3/2
5s4P1/2–p4P3/2
(62 026.3, 5p4P1/2)
2.584–1.570
(5s4P1/2–5p4P1/2)
62 398.0, 5p4P1/2
10 793.4
1/2–1/2
5s2P1/2–5p4P1/2
The level value 62 398 cm−1 is based on three lines. The two listed here give Zeeman patterns and both indicate that the J value of this level is 1/2.
(62 398.0, 5p4P3/2)
0.74–2.50
(5s2P1/2–5p4P3/2)
62 398.0, 5p4P1/2
9 267.2
3/2–1/2
5s4P3/2–5p4P1/2
(62 398.0, 5p4P3/2)
1.720–2.496
(5s4P3/2–5p4P3/2)
69 933.5, 6p4D3/2*
5 196.2
1/2–3/2
5s4P1/2–6p4D3/2
The former level value 70849 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification. * This classification was formerly assigned to 70516.6 entered below.
(70 849.7, 6p4P3/2)
2.59–1.13
(5s4P3/2–6p4P3/2)
69 881.5, 6p4D1/2
Redesignation was based on least-squares calculation.
(69 881.5, 6p4P1/2)
70 516.6, 5p2D3/2
Redesignation was based on least-squares calculation. Note the change of configuration.
(70 516.6, 6p4D3/2)
70 790.9, 6p2S1/2
5 212.1
3/2–1/2
5s4P3/2–6p2S1/2
This new level is supported by two lines and their Zeeman patterns and its level value and g value are in accordance with least-squares predictions.
1.723–1.361
(unclassified)
4 974.8
1/2–1/2
5s4P1/2–6p2S1/2
2.60–1.35
(new line)
71 053.9, 6p4P3/2
5 141.6
3/2–3/2
5s4P3/2–6p4P3/2
The former level value 72341 cm−1 was based on only one line. The J and g values determined from the Zeeman pattern of that line required the new classification.
(72 341.6, 6p4D7/2)
1.730–1.51
(5s4P5/2–6p4D7/2)
71 199.1, 6p4P1/2
Redesignation was based on least-squares calculation.
(71 199.1, 6p2S1/2)
72 382.7, 6p4D7/2
5 130.8
5/2–7/2
5s4P5/2–6p4D7/2
This line can be doubly classified. The level 72 620.3 cm−1 is supported by three lines, two of them having Zeeman patterns confirming its classification. However, the Zeeman pattern of this line clearly indicates the higher J values. Since the g value of the level 5s4P5/2 is 1.588, it seems probable that this line is the combination indicated to establish the level 6p4D7/2 at a new value of 72 382.7 cm−1. Both the new level value and its g value are in accordance with calculations.
(72 620.3, 6p4S3/2)
1.572–1.414
(5s4P1/2–6p4S3/2)
rejected (70 108.4, 5p2D3/2)
10 780.4
This level was rejected since the only supportine line, 10780 A, was not found even in the long exposures.
rejected (70 274.9, 6p4D1/2)
51 05.6
This line was not found even in long exposures. The classification is therefore rejected.
TABLE III
Comparison of experimental and calculated results for the multiconfigurations 4s24p25p–4s24p26p
The letters preceding the term values have the following meanings: N-new level, R-reclassified, J-J changed, C-configuration changed.
Level designations without prime have the parent levels 3P. Single prime indicates the parent level 1D2. Double prime means a parent level 1S0.
Predicted term value is higher than the ionization limit.
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