Liejuan Jia, Chunyang Jing, Guoming Guan, Zhiyao Zhou, and Fucheng Lin, "Hyperfine-structure studies of high-lying even-parity levels of 139La i by resonantly enhanced Doppler-free two-photon spectroscopy," J. Opt. Soc. Am. B 10, 433-437 (1993)
The technique of employing resonantly enhanced Doppler-free two-photon excitation from either the ground state or a low-lying metastable state for precisely measuring the hyperfine structure of the atomic high-lying levels has been used, for the first time to our knowledge, to study 139La i. By detecting the laser-induced fluorescence produced in a hollow-cathode discharge tube, one can measure a set of spectra for each two-photon transition line. The spectra are analyzed in detail and fitted to yield hyperfine structure constants. The A values of eight high-lying even-parity levels of 139La i are then determined.
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Pertinent Data for hfs Components of the Two-Photon Transition 1053.16 cm−1 → 17910.17 cm−1 → 35096.10 cm−1a
Line Order
F → F′ → F″
Δνobs (MHz)
Δνcorr (MHz)
Δνcal (MHz)
Δνcal − Δνcorr (MHz)
A
6 → 7 → 7
0
0
0
0
B
6 → 7 → 6
−1265
−1265
−1262
3
C
5 → 6 → 6
−137
−120
−141
−21
D
5 → 6 → 5
−1234
−1217
−1222
−5
E
5 → 6 → 7
1116
1133
1121
−12
The line order, in column 1, corresponds to the labels in Fig. 3. Δνobs, Δνcorr, and Δνcal are observed, corrected, and calculated relative frequencies, respectively.
Table 2
Pertinent Data for hfs Components of the Two-Photon Transition 1053.16 cm−1 → 17 910.17 cm−1 → 35 169.58 cm−1a
Line Order
F → F′ → F″
Δνobs (MHz)
Δνcorr (MHz)
Δνcal (MHz)
Δνcal − Δνcorr (MHz)
A
6 → 7 → 8
0
0
0
0
B
6 → 7 → 7
−1278
−1278
−1306
−28
C
5 → 6 → 7
−225
−204
−185
19
D
5 → 6 → 6
−1349
−1328
−1328
0
The line order, in column 1, corresponds to the labels in Fig. 5. Δνobs, Δνcorr, and Δνcal are observed, corrected, and calculated relative frequencies, respectively.
Table 3
Single-Photon Transition Lines Used in the Present Study of 139La ia
λ1 (Å)
Configuration
E1 (cm−1)
SLJ
Configuration
E2 (cm−1)
J
λf1 (Å)
5932.32
5d6s2
0.00
2D3/2
5d26p
16856.80
5/2
7047.9
5932.26
5d6s2
1053.16
2D5/2
5d26p
17910.17
7/2
6711.2
5857.21
5d26s
3010.00
4F5/2
5d26p
20 082.98
3/2
5254.9
The laser wavelength (λ1, in vacuum) is given in the first column, and the excitation energies and spectroscopic descriptions of the lower (E1) and upper (E2) states of the transition are listed in the next six columns. The fluorescence wavelength (λf1, in vacuum) is given in the final column.
Table 4
Single-Photon Transition Lines Used in the Present Study of 139La ia
λ2 (Å)
Configuration
E2 (cm−1)
J
Configuration
E3 (cm−1)
J
λf2(Å)
5917.28
5d26p
16 856.80
5/2
5d26p
33 756.45
7/2
5276.4
5822.11
5d26p
16 856.80
5/2
—
34 032.72
7/2
6216.7
6018.11
5d26p
17 910.17
7/2
5d26p
34 526.69
9/2
5559.7
5818.71
5d26p
17 910.17
7/2
—
35 096.10
7/2
5482.7
5811.40
5d26p
17 910.17
7/2
—
35 117.70
5/2
5476.2
5793.94
5d26p
17 910.17
7/2
—
35 169.58
9/2
7403.5
5751.10
5d26p
17 910.17
7/2
—
35 298.12
7/2
5990.1
5689.41
5d26p
20 082.98
3/2
—
37 659.48
1/2
5689.4
The laser wavelength (λ2, in vacuum) is given in the first column, and the excitation energies and spectroscopic descriptions of the lower (E2) and upper (E3) states of the transition are listed in the next six columns. The fluorescence wavelength (λf2, in vacuum) is given in the final column.
Table 5
Hfs Constants Determined for 139La i High-Lying Even-Parity Levels by Resonantly Enhanced Doppler-Free Two-Photon Spectroscopya
E3 (cm−1)
A (MHz)
B (MHz)
33 756.45
177.6(10)
—
34 032.72
287.2(111)
—
34 526.69
50.0(7)
—
35 096.10
180.2(7)
—
35 117.70
161.9(1)
—
35 169.58
163.2(1)
—
35 298.12
57.1(31)
—
37 659.48
255.2(111)
0
All the A values without corresponding B values listed are calculated by assuming B = 0.
Tables (5)
Table 1
Pertinent Data for hfs Components of the Two-Photon Transition 1053.16 cm−1 → 17910.17 cm−1 → 35096.10 cm−1a
Line Order
F → F′ → F″
Δνobs (MHz)
Δνcorr (MHz)
Δνcal (MHz)
Δνcal − Δνcorr (MHz)
A
6 → 7 → 7
0
0
0
0
B
6 → 7 → 6
−1265
−1265
−1262
3
C
5 → 6 → 6
−137
−120
−141
−21
D
5 → 6 → 5
−1234
−1217
−1222
−5
E
5 → 6 → 7
1116
1133
1121
−12
The line order, in column 1, corresponds to the labels in Fig. 3. Δνobs, Δνcorr, and Δνcal are observed, corrected, and calculated relative frequencies, respectively.
Table 2
Pertinent Data for hfs Components of the Two-Photon Transition 1053.16 cm−1 → 17 910.17 cm−1 → 35 169.58 cm−1a
Line Order
F → F′ → F″
Δνobs (MHz)
Δνcorr (MHz)
Δνcal (MHz)
Δνcal − Δνcorr (MHz)
A
6 → 7 → 8
0
0
0
0
B
6 → 7 → 7
−1278
−1278
−1306
−28
C
5 → 6 → 7
−225
−204
−185
19
D
5 → 6 → 6
−1349
−1328
−1328
0
The line order, in column 1, corresponds to the labels in Fig. 5. Δνobs, Δνcorr, and Δνcal are observed, corrected, and calculated relative frequencies, respectively.
Table 3
Single-Photon Transition Lines Used in the Present Study of 139La ia
λ1 (Å)
Configuration
E1 (cm−1)
SLJ
Configuration
E2 (cm−1)
J
λf1 (Å)
5932.32
5d6s2
0.00
2D3/2
5d26p
16856.80
5/2
7047.9
5932.26
5d6s2
1053.16
2D5/2
5d26p
17910.17
7/2
6711.2
5857.21
5d26s
3010.00
4F5/2
5d26p
20 082.98
3/2
5254.9
The laser wavelength (λ1, in vacuum) is given in the first column, and the excitation energies and spectroscopic descriptions of the lower (E1) and upper (E2) states of the transition are listed in the next six columns. The fluorescence wavelength (λf1, in vacuum) is given in the final column.
Table 4
Single-Photon Transition Lines Used in the Present Study of 139La ia
λ2 (Å)
Configuration
E2 (cm−1)
J
Configuration
E3 (cm−1)
J
λf2(Å)
5917.28
5d26p
16 856.80
5/2
5d26p
33 756.45
7/2
5276.4
5822.11
5d26p
16 856.80
5/2
—
34 032.72
7/2
6216.7
6018.11
5d26p
17 910.17
7/2
5d26p
34 526.69
9/2
5559.7
5818.71
5d26p
17 910.17
7/2
—
35 096.10
7/2
5482.7
5811.40
5d26p
17 910.17
7/2
—
35 117.70
5/2
5476.2
5793.94
5d26p
17 910.17
7/2
—
35 169.58
9/2
7403.5
5751.10
5d26p
17 910.17
7/2
—
35 298.12
7/2
5990.1
5689.41
5d26p
20 082.98
3/2
—
37 659.48
1/2
5689.4
The laser wavelength (λ2, in vacuum) is given in the first column, and the excitation energies and spectroscopic descriptions of the lower (E2) and upper (E3) states of the transition are listed in the next six columns. The fluorescence wavelength (λf2, in vacuum) is given in the final column.
Table 5
Hfs Constants Determined for 139La i High-Lying Even-Parity Levels by Resonantly Enhanced Doppler-Free Two-Photon Spectroscopya
E3 (cm−1)
A (MHz)
B (MHz)
33 756.45
177.6(10)
—
34 032.72
287.2(111)
—
34 526.69
50.0(7)
—
35 096.10
180.2(7)
—
35 117.70
161.9(1)
—
35 169.58
163.2(1)
—
35 298.12
57.1(31)
—
37 659.48
255.2(111)
0
All the A values without corresponding B values listed are calculated by assuming B = 0.
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