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orange-red, very bright. Spectrum highly resolved with many line-like bands.
Erbium
Borax
green (terbium lines)
Very dim.
NaF
green (continuous sp.)
CaF2
——
Terbium lines (no continuous spectrum.
Table 2
Bands in the spectrum of thallium in solid solution in CaF2
Set A
Sets No. B, C and D
μ
103/μ
Δ
μ
103/μ
Δ
.660
1515
111 = 7×16−1
.615
1626
B
.520
1923
98 = 6×16+2
.580
1724
49 = 3×16+1
.564
1773
C
.455
2198
64 = 4×16±0
64=4×16±0
.544
1837
.442
2262
32 = 2×16±0
.535
1869
D
+90
2041
.467
2141
Interval (from extremes) 16.05
To designate single bands as members of a set of which no other members have been found may seem unwarranted, but our knowledge of such spectra would indicate the improbability of individual bands not thus connected. Band 1923 (set B) has in fact been found to belong to a set of emission bands whose relation to the luminescence of thulium is to be considered elsewhere.
Table 3
Bands in the spectrum of europium in solid solution in NaPO3
Band at.625 due to Eu is omitted.
Bands at.630μ, also.625μ. 594μ and 530μ (Eu) are omitted.
Three other lines in vorax which are displaced two units from Set A and are probably composites of Sets A and B due to incomplete resolutions are located at.622μ.598μ and.494μ.
Table 7
Bands in the luminescence spectrum of samarium
Solvent
CaO
CaF2
Borax
μ
103/μ
Δ
μ
103/μ
Δ
μ
103/μ
Δ
Set A
.580
1724
.580
1724
.640
1563
15
15
76
.575
1739
.575
1739
.575
1739
63
63
31
.565
1770
91
.555
1802
.555
1802
.510
1961
Set B
.678
1475
79
.643
1554
.650
1539
63
.618
1617
.619
1617
64
64
.595
1681
.595
1681
60
31
.543
1841
.584
1712
65
.563
1777
Set C
.605
1653
48
.588
1701
63
.567
1764
64
.547
1828
Set C′
.622
1607
.649
1541
.604
114
1655
.610
1639
76
33
1
.546
1831
.598
1672
Lines due to europium
1587
1587
1887
1887
Tables (7)
Table 1
(a). Effect of the rare earth elements as activators.
orange-red, very bright. Spectrum highly resolved with many line-like bands.
Erbium
Borax
green (terbium lines)
Very dim.
NaF
green (continuous sp.)
CaF2
——
Terbium lines (no continuous spectrum.
Table 2
Bands in the spectrum of thallium in solid solution in CaF2
Set A
Sets No. B, C and D
μ
103/μ
Δ
μ
103/μ
Δ
.660
1515
111 = 7×16−1
.615
1626
B
.520
1923
98 = 6×16+2
.580
1724
49 = 3×16+1
.564
1773
C
.455
2198
64 = 4×16±0
64=4×16±0
.544
1837
.442
2262
32 = 2×16±0
.535
1869
D
+90
2041
.467
2141
Interval (from extremes) 16.05
To designate single bands as members of a set of which no other members have been found may seem unwarranted, but our knowledge of such spectra would indicate the improbability of individual bands not thus connected. Band 1923 (set B) has in fact been found to belong to a set of emission bands whose relation to the luminescence of thulium is to be considered elsewhere.
Table 3
Bands in the spectrum of europium in solid solution in NaPO3
Band at.625 due to Eu is omitted.
Bands at.630μ, also.625μ. 594μ and 530μ (Eu) are omitted.
Three other lines in vorax which are displaced two units from Set A and are probably composites of Sets A and B due to incomplete resolutions are located at.622μ.598μ and.494μ.