The optical absorption spectra of 1% Gd:LaBr3, 5% Gd:LaCl3, GdCl3, 2% Gd:Y(OH)3 and Gd(OH)3 at 1.5 K in high resolution are given over the region 31 000 cm−1 to 41 000 cm−1. Reduced matrix elements based on intermediate-coupling free-ion calculations are used to perform a crystal-field analysis for Gd3+ in a
(C3h) symmetry electrostatic field. A least-squares fit to levels in each crystal has led to the assignment of M quantum numbers to most levels and of Bkq parameters to each crystalline host.
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Repetition of value means absorption line is probably double.
Relative scale 1–10; d = diffuse.
Lines very weak.
For states <60% pure, M of next-largest contributor in parentheses.
Table II
Energy levels of 5% Gd:LaCl3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a double.
Estimated from LaBr3 splitting and possible line on plate.
Relative scale 1–10; d = diffuse, b = broad.
Lines very weak.
For states <60% pure, M of next-largest contributor in parentheses.
Table III
Energy levels of GdCl3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a multiple.
Double in σ, separation given in parentheses.
Double in π, separation in parentheses, single in σ at double midpoint.
For bands, only edges measurable.
Relative scale 1–10; 10 = overabsorbed, b = broad, d = diffuse.
For states <60% pure, M of next-largest contributor in parentheses.
Table IV
Energy levels of 2% Gd:Y(OH)3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a double.
Double, separation in parentheses.
For bands, only edges measurable.
Relative scale 1–10; 10 = overabsorbed, b = broad, d = diffuse.
For states <60% pure, M of next-largest contributor in parentheses.
Table VI
Gd3+ free-ion parameters (all values in cm−1).
Env = 860.6
E3 = 634.0
E1 = 6056.5
ζ = 1435.0
E2 = 33.9
α = 20.0
Table VII
Calculated intermediate-coupling g values.
Free-ion level
g (calc.)
6P3/2
2.3484
6P5/2
1.8411
6P7/2
1.6795
6I7/2
0.4605
6I9/2
0.8356
6I11/2
1.0376
6I13/2
1.1588
6I15/2
1.2370
6I17/2
1.2903
6D1/2
3.3119
6D3/2
1.8928
6D5/2
1.6742
6D7/2
1.5903
6D9/2
1.5445
Table VIII
Hexagonal crystal-field parameters with J mixing.
1% Gd:LaBr3
5% Gd:LaCl3
GdCl3
2% Gd:Y(OH)3
Gd(OH)3
B20
128±9
108±7
133±9
175±12
183±11
B40
−36±7
−34±5
−41±7
−78±9
−57±8
B60
−43±15
−56±11
−61±20
−36±13
−85±25
B66
570±85
450±60
−610±100
650±100
840±140
E(6P7/2)
32097.0
32121.5
32084.1
32036.8
32054.9
E(6P5/2)
32692.3
32717.7
32679.5
32627.8
32647.1
E(6P3/2)
33263.1
33288.3
33251.7
33221.1
E(6I7/2)
35825.0
35849.4
35807.9
35767.0
35783.5
E(6I9/2)
36166.3
36194.3
36151.0
36111.9
36127.1
E(6I17/2)
36199.9
36245.0
36206.0
36174.7
36190.8
E(6I11/2)
36439.3
36471.3
36429.7
36389.2
36403.9
E(6I15/2)
36546.8
36589.0
36546.6
36513.1
36525.7
E(6I13/2)
36586.3
36622.5
36581.0
36548.2
36563.0
E(6D9/2)
39507.0
39555.5
39508.1
39502.3
E(6D1/2)
40428.2
40492.4
40444.5
40424.9
E(6I7/2)
40516.4
40586.7
40538.7
40531.3
E(6D3/2)
40679.2
40745.4
40694.1
40680.7
E(6D5/2)
40786.2
40856.6
40806.0
Tables (8)
Table I
Energy levels of 1% Gd:LaBr3 at 1.5 K; all energies in cm−1.
Repetition of value means absorption line is probably double.
Relative scale 1–10; d = diffuse.
Lines very weak.
For states <60% pure, M of next-largest contributor in parentheses.
Table II
Energy levels of 5% Gd:LaCl3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a double.
Estimated from LaBr3 splitting and possible line on plate.
Relative scale 1–10; d = diffuse, b = broad.
Lines very weak.
For states <60% pure, M of next-largest contributor in parentheses.
Table III
Energy levels of GdCl3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a multiple.
Double in σ, separation given in parentheses.
Double in π, separation in parentheses, single in σ at double midpoint.
For bands, only edges measurable.
Relative scale 1–10; 10 = overabsorbed, b = broad, d = diffuse.
For states <60% pure, M of next-largest contributor in parentheses.
Table IV
Energy levels of 2% Gd:Y(OH)3 at 1.5 K; all energies in cm−1.
Repetition of value means line is probably a double.
Double, separation in parentheses.
For bands, only edges measurable.
Relative scale 1–10; 10 = overabsorbed, b = broad, d = diffuse.
For states <60% pure, M of next-largest contributor in parentheses.
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