Four hundred and ten lines of the ultraviolet spectrum, from 2117 A to 3072 A, have been measured in this study, with a probable error of 0.005 A, on high-dispersion quartz-prism spectrograms. A small electronic computer, the Burroughs E101, has been used to great advantage in calculating the wavelengths and wave numbers and in analyzing the spectrum. Two new terms have been discovered. Two hundred and fourteen lines have been classified, of which 152 were previously known. The energy values for 16 levels of seven previously known terms have been revised.
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s3G0 multiplets. The energy level values are below the designations. The calculated wave number for each transition is in parentheses. The observed intensities are in parentheses after the observed wave numbers. Observed and calculated intervals are italicized.
s3G30
s3G40
s3G50
46 725.42
112.67
46 838.09
136.56
46 974.65
a3F2
46 725.40(6)
0.00
(46 725.42)
a3F3
46 555.37(−)
112.59
46 667.96(6)
170.13
(46 555.29)
(46 667.96)
a3F4
46 451.22(1)
136.56
46 587.78(7)
386.87
(46 451.22)
(46 587.78)
b3F2
11 531.76
b3F3
35 085.56(0)
112.51
35 198.09(−)
11 639.80
(35 085.62)
(35 198.29)
b3F4
35 19 809(−)
11 776.81
(35 197.85)
Table II
p3F0 multiplets. The energy level values are below the designations. The calculated wave number for each transition is in parentheses. The observed intensities are in parentheses after the observed wave numbers. Observed and calculated intervals are italicized.
p3F20
p3F30
p3F40
47 187.54
94.36
47 281.90
181.16
47 463.06
a3F2
47 187.55(2)
0.00
(47 187.54)
a3F3
47 111.61(3)
170.13
(47 111.77)
a3F4
47 076.03(4)
386.87
(47 076.19)
b3F2
35 655.74 (5)
11 531.76
(35 655.78)
b3F3
35 547.78(1)
94.55
35 642.33(6)
181.04
35 823.37(2)
11 639.80
(35 547.73)
(35 642.10)
(35 823.26)
b3F4
35 686.20(6)
11 776.81
(35 686.26)
a1G4
35 163.43(−)
12 118.39
(35 163.51)
Table III
Revised energy level values. The values assigned by Russell (footnote 13) are also listed.
Designated
Revised value (cm−1)
Russell value (cm−1)
v5D20
41 906.51
41 906.61
v5D30
41 985.83
41 985.93
v5D40
42 092.42
42 092.52
p3D10
42 194.04
42 193.94
p3D20
42 269.78
42 269.72
p3D30
42 376.45
42 376.71
o3D10
43 975.71
43 975.62
o3D20
44 079.84
44 079.39
o3D30
44 233.65
44 233.15
q3F20
44 824.13
44 825.26
q3F30
44 922.73
44 923.00
q3F40
45 040.81
45 041.02
w3S10
44 858.03
44 857.89
n3D10
44 966.39
44 966.36
n3D20
45 063.80
45 063.94
n3D30
45 206.27
45 206.34
Table IV
Comparison of observed values used in calculating selected levels from Table III.
The new interferometric values5 were used for the lower levels.
The difference between the observed and calculated wavelengths of the line involved.
Calculated from the wave numbers of the lines and lower levels as Russell lists them.13
This value was assigned a weight of one-half in the calculations.
This value was disregarded in the calculations.
Scale is from 0 to 10 with a dash indicating very weak lines. Intensities are not given for the lines referred to in footnote c.
The numbers used to distinguish lines belonging to the same multiplet were assigned by Russell.13 Newly found multiplets are designated by lower case letters.
Twenty-six lines classified by Russell13 but not observed in this work (see Sec. V) have been included in the list. The wavelengths of these lines have been placed in parentheses.
Lines not reported by Russell. A few may be found in the MIT Tables.10
Tables (5)
Table I
s3G0 multiplets. The energy level values are below the designations. The calculated wave number for each transition is in parentheses. The observed intensities are in parentheses after the observed wave numbers. Observed and calculated intervals are italicized.
s3G30
s3G40
s3G50
46 725.42
112.67
46 838.09
136.56
46 974.65
a3F2
46 725.40(6)
0.00
(46 725.42)
a3F3
46 555.37(−)
112.59
46 667.96(6)
170.13
(46 555.29)
(46 667.96)
a3F4
46 451.22(1)
136.56
46 587.78(7)
386.87
(46 451.22)
(46 587.78)
b3F2
11 531.76
b3F3
35 085.56(0)
112.51
35 198.09(−)
11 639.80
(35 085.62)
(35 198.29)
b3F4
35 19 809(−)
11 776.81
(35 197.85)
Table II
p3F0 multiplets. The energy level values are below the designations. The calculated wave number for each transition is in parentheses. The observed intensities are in parentheses after the observed wave numbers. Observed and calculated intervals are italicized.
p3F20
p3F30
p3F40
47 187.54
94.36
47 281.90
181.16
47 463.06
a3F2
47 187.55(2)
0.00
(47 187.54)
a3F3
47 111.61(3)
170.13
(47 111.77)
a3F4
47 076.03(4)
386.87
(47 076.19)
b3F2
35 655.74 (5)
11 531.76
(35 655.78)
b3F3
35 547.78(1)
94.55
35 642.33(6)
181.04
35 823.37(2)
11 639.80
(35 547.73)
(35 642.10)
(35 823.26)
b3F4
35 686.20(6)
11 776.81
(35 686.26)
a1G4
35 163.43(−)
12 118.39
(35 163.51)
Table III
Revised energy level values. The values assigned by Russell (footnote 13) are also listed.
Designated
Revised value (cm−1)
Russell value (cm−1)
v5D20
41 906.51
41 906.61
v5D30
41 985.83
41 985.93
v5D40
42 092.42
42 092.52
p3D10
42 194.04
42 193.94
p3D20
42 269.78
42 269.72
p3D30
42 376.45
42 376.71
o3D10
43 975.71
43 975.62
o3D20
44 079.84
44 079.39
o3D30
44 233.65
44 233.15
q3F20
44 824.13
44 825.26
q3F30
44 922.73
44 923.00
q3F40
45 040.81
45 041.02
w3S10
44 858.03
44 857.89
n3D10
44 966.39
44 966.36
n3D20
45 063.80
45 063.94
n3D30
45 206.27
45 206.34
Table IV
Comparison of observed values used in calculating selected levels from Table III.
The new interferometric values5 were used for the lower levels.
The difference between the observed and calculated wavelengths of the line involved.
Calculated from the wave numbers of the lines and lower levels as Russell lists them.13
This value was assigned a weight of one-half in the calculations.
This value was disregarded in the calculations.
Scale is from 0 to 10 with a dash indicating very weak lines. Intensities are not given for the lines referred to in footnote c.
The numbers used to distinguish lines belonging to the same multiplet were assigned by Russell.13 Newly found multiplets are designated by lower case letters.
Twenty-six lines classified by Russell13 but not observed in this work (see Sec. V) have been included in the list. The wavelengths of these lines have been placed in parentheses.
Lines not reported by Russell. A few may be found in the MIT Tables.10
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