Earl F. Worden, Lee R. Carlson, Steve A. Johnson, Jeffrey A. Paisner, and Richard W. Solarz, "Ionization potential of neutral atomic plutonium determined by laser spectroscopy," J. Opt. Soc. Am. B 10, 1998-2005 (1993)
The ionization potential of the neutral plutonium atom, Pu i, has been determined by two- and three-step resonance photoionization observation of the threshold of ionization and of Rydberg series. The Rydberg series were observed by field ionization as series that converge to the first ionization limit and as autoionizing series that converge to the second and to several higher convergence limits. The threshold and Rydberg series were obtained through a number of two- and three-step pathways. The photoionization threshold value for the 239Pu i ionization potential is 48582(30) cm−1, and the more accurate value from the Rydberg series is 48604(1) cm−1 or 6.0262(1) eV.
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Wavelengths and frequencies are for 239Pu. The values in Ref. 17 are for 240Pu. The values in the table were derived from level and isotope shift values in Ref. 17.
Isotope shift from laser spectroscopy measurement.
The uncertainty of the threshold ionization potential is considerably larger than the deviation given here; see text.
Table 4
Convergence Limits and IP Values Derived from Various Rydberg Series Observed with 239Pu as an Atom Sourcea
λ1 (Å)
Level 1 (cm−1)
λ2 (Å)
Level 2 (cm−1)
Convergence Limit
Pu ii Level cm−1
IP
5864.9
17 045.856
6761.5
31 831.278
48603
0.00
48 603(2)
6304.6
15 846.752
6070.9
32 324.154
50619
2014.97
48 604(2)
51839
3235.69
48 603(2)
5712.4
17 500.919
6506.3
32 866.318
50620
2014.97
48 605(1)
51840
3235.69
48 604(2)
6488.9
15 406.636
5585.5
33 304.519
50620
2014.97
48 605(1)
Average 48 604(1)
Wavelengths and levels are for 239Pu derived from the 240Pu levels and isotope shifts in Refs. 16 and 17.
Table 5
Frequenciesa of a J = 1 Autoionization Rydberg Series, from the 33 304.519 cm−1, J = 0 Level of 239Pu, that Shows hfs Splitting of +0.15(2) cm−1
The frequencies are accurate relative values (±0.02 cm−1) obtained by use of fringes from a 14.16-GHz étalon that monitored a portion of the scanning laser; the fringes were recorded simultaneously.
Frequencies are not accurate absolute frequencies but have an uncertainty of ±1 cm−1 because the frequency scale is based on values from the Jobin–Yvon spectrometer and Pu emission line settings.
Tables (5)
Table 1
Plutonium First IP Values (239Pu) Obtained by Various Techniques
Wavelengths and frequencies are for 239Pu. The values in Ref. 17 are for 240Pu. The values in the table were derived from level and isotope shift values in Ref. 17.
Isotope shift from laser spectroscopy measurement.
The uncertainty of the threshold ionization potential is considerably larger than the deviation given here; see text.
Table 4
Convergence Limits and IP Values Derived from Various Rydberg Series Observed with 239Pu as an Atom Sourcea
λ1 (Å)
Level 1 (cm−1)
λ2 (Å)
Level 2 (cm−1)
Convergence Limit
Pu ii Level cm−1
IP
5864.9
17 045.856
6761.5
31 831.278
48603
0.00
48 603(2)
6304.6
15 846.752
6070.9
32 324.154
50619
2014.97
48 604(2)
51839
3235.69
48 603(2)
5712.4
17 500.919
6506.3
32 866.318
50620
2014.97
48 605(1)
51840
3235.69
48 604(2)
6488.9
15 406.636
5585.5
33 304.519
50620
2014.97
48 605(1)
Average 48 604(1)
Wavelengths and levels are for 239Pu derived from the 240Pu levels and isotope shifts in Refs. 16 and 17.
Table 5
Frequenciesa of a J = 1 Autoionization Rydberg Series, from the 33 304.519 cm−1, J = 0 Level of 239Pu, that Shows hfs Splitting of +0.15(2) cm−1
The frequencies are accurate relative values (±0.02 cm−1) obtained by use of fringes from a 14.16-GHz étalon that monitored a portion of the scanning laser; the fringes were recorded simultaneously.
Frequencies are not accurate absolute frequencies but have an uncertainty of ±1 cm−1 because the frequency scale is based on values from the Jobin–Yvon spectrometer and Pu emission line settings.