An investigation is made of the spectroscopic isotope shift in the Pb II visible spectrum by using enriched isotopes. The isotope structure of Pb204, Pb206, and Pb208, and the hyperfine structure of Pb207 in the transitions;
are analyzed with a Fabry-Perot interferometer crossed with a constant-deviation Hilger spectrograph. The samples are excited in a Schüler hollow cathode discharge tube. Spacings between consecutive even isotopes, (205–206), (206–208), the centroid of the odd isotope and the isotope 208 (207c.g.–208), and the ratios (204–206)/(206–208), (206–207c.g.)/(207c.g.–208) are given.
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The isotope shift is considered positive when the component of the lighter isotope is shifted toward the high frequency side of the heavier isotope component.
See reference 3.
Spacing between centroid of the hfs of the odd isotope and the component of the isotope 208.
K. Murakawa. See reference 4.
Table III
Pb207 hyperfine structure intervals from Pb208 component.
The hfs components designation follows that of Murakawa and Suwa, and Murakawa. See references 3 and 4.
Values in this column obtained in this investigation.
Murakawa, see reference 4.
Values in this column obtained by Murakawa and Suwa, except where noted. See reference 3.
To obtain (207a–208) of 17 824 cm−1, (207b–207c) of 15 011 cm−1 was measured and subtracted from (207b–207c) of 17 824 cm−1. The author is indebted to Dr. H. Arroe for suggesting this method of calculating the position of the component 207a.
(207a–208) of 18 032 cm−1 was found by adding the hfs splitting of the 7 2P3/2 level to (207b–208) of 18 032 cm−1.
(206–207c.g.) is the separation of the component of the isotope 206 from the centroid of the hfs components of the isotope 207.
Murakawa, see reference 4.
Values in this column obtained by Murakawa and Suwa, except where noted. See reference 3.
Values in this column obtained in this investigation.
Blaise, see reference 9.
Tables (4)
Table I
Experimental conditions under which hfs and isotope structure were obtained.
Wave number (cm−1)
Carrier gas
Spacer (mm)
Enriched isotope
Number of independent arrays
Remarks
15 011
A
10
Pb207CrO4
3
All components resolved
17 824
He
15
Pb204SO4
5
All components of even isotopes resolved
He
25
Pb207CrO4
3
Component 207a not resolved
18 032
He
15
Pb204SO4
5
Component 207b not resolved; may have affected (204–206) by 2 to 3 ×10−3 cm−1
The isotope shift is considered positive when the component of the lighter isotope is shifted toward the high frequency side of the heavier isotope component.
See reference 3.
Spacing between centroid of the hfs of the odd isotope and the component of the isotope 208.
K. Murakawa. See reference 4.
Table III
Pb207 hyperfine structure intervals from Pb208 component.
The hfs components designation follows that of Murakawa and Suwa, and Murakawa. See references 3 and 4.
Values in this column obtained in this investigation.
Murakawa, see reference 4.
Values in this column obtained by Murakawa and Suwa, except where noted. See reference 3.
To obtain (207a–208) of 17 824 cm−1, (207b–207c) of 15 011 cm−1 was measured and subtracted from (207b–207c) of 17 824 cm−1. The author is indebted to Dr. H. Arroe for suggesting this method of calculating the position of the component 207a.
(207a–208) of 18 032 cm−1 was found by adding the hfs splitting of the 7 2P3/2 level to (207b–208) of 18 032 cm−1.
(206–207c.g.) is the separation of the component of the isotope 206 from the centroid of the hfs components of the isotope 207.
Murakawa, see reference 4.
Values in this column obtained by Murakawa and Suwa, except where noted. See reference 3.
Values in this column obtained in this investigation.
Blaise, see reference 9.
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