Abstract

The spectrum of doubly ionized praseodymium was recorded and analyzed, with the result that 118 energy levels of odd parity and 130 levels of even parity were derived. These include nearly all the levels of the 4f3, 4f25d, 4f26s, and 4f26p configurations as well as some low levels of the 4f5d2 and 4f26d configurations. Electrostatic and spin–orbit parameters were determined for the 4f26s configuration. From the hfs of the 4f26s levels, a magnetic dipole interaction constant of 0.46 cm−1 was obtained. An ionization potential of 23.2 V was calculated from levels of the 4f26d and 4f26d series.

© 1963 Optical Society of America

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References

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  1. H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
    [Crossref]
  2. P. F. A. Klinkenberg, Physica 16, 618 (1950).
    [Crossref]
  3. G. H. Dieke, H. M. Crosswhite, and B. Dunn, J. Opt. Soc. Am. 51, 820 (1961).
    [Crossref]
  4. G. Racah, J. Opt. Soc. Am. 50, 396 (1960).
  5. N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
    [Crossref]
  6. K. Bockasten, Ark. Fysik. 9, 457 (1955).
  7. H. M. Crosswhite, (1958).
  8. H. Lew, Phys. Rev. 89, 530 (1953).
    [Crossref]
  9. G. R. Harrison, W. E. Albertson, and N. T. Hosford, J. Opt. Soc. Am. 31, 439 (1941).
    [Crossref]
  10. G. H. Dieke and R. Sarup, J. Chem. Phys. 29, 741 (1958).
    [Crossref]
  11. S. Goudsmit and R. F. Bacher, Phys. Rev. 34, 1501 (1929).
    [Crossref]
  12. B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).
    [Crossref]
  13. B. W. Bryant, (1961).
  14. R. E. Trees, Phys. Rev. 84, 1089 (1951).
    [Crossref]
  15. E. H. Carlson and H. M. Crosswhite, (1960).
  16. R. E. Trees (to be published).
  17. A. G. Shenstone, J. C. Boyce, and H. N. Russell, Rydberg Interpolation Table, Princeton, 1934.

1961 (2)

1960 (1)

1958 (1)

G. H. Dieke and R. Sarup, J. Chem. Phys. 29, 741 (1958).
[Crossref]

1955 (1)

K. Bockasten, Ark. Fysik. 9, 457 (1955).

1953 (1)

H. Lew, Phys. Rev. 89, 530 (1953).
[Crossref]

1951 (1)

R. E. Trees, Phys. Rev. 84, 1089 (1951).
[Crossref]

1950 (1)

P. F. A. Klinkenberg, Physica 16, 618 (1950).
[Crossref]

1941 (2)

N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
[Crossref]

G. R. Harrison, W. E. Albertson, and N. T. Hosford, J. Opt. Soc. Am. 31, 439 (1941).
[Crossref]

1937 (1)

H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
[Crossref]

1929 (1)

S. Goudsmit and R. F. Bacher, Phys. Rev. 34, 1501 (1929).
[Crossref]

Albertson, W. E.

Bacher, R. F.

S. Goudsmit and R. F. Bacher, Phys. Rev. 34, 1501 (1929).
[Crossref]

Bockasten, K.

K. Bockasten, Ark. Fysik. 9, 457 (1955).

Boyce, J. C.

A. G. Shenstone, J. C. Boyce, and H. N. Russell, Rydberg Interpolation Table, Princeton, 1934.

Bryant, B. W.

B. W. Bryant, (1961).

Carlson, E. H.

E. H. Carlson and H. M. Crosswhite, (1960).

Crosswhite, H. M.

G. H. Dieke, H. M. Crosswhite, and B. Dunn, J. Opt. Soc. Am. 51, 820 (1961).
[Crossref]

E. H. Carlson and H. M. Crosswhite, (1960).

H. M. Crosswhite, (1958).

Dieke, G. H.

Dunn, B.

Goudsmit, S.

S. Goudsmit and R. F. Bacher, Phys. Rev. 34, 1501 (1929).
[Crossref]

Harrison, G. R.

N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
[Crossref]

G. R. Harrison, W. E. Albertson, and N. T. Hosford, J. Opt. Soc. Am. 31, 439 (1941).
[Crossref]

Hosford, N. T.

Judd, B. R.

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).
[Crossref]

King, R. B.

H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
[Crossref]

Klinkenberg, P. F. A.

P. F. A. Klinkenberg, Physica 16, 618 (1950).
[Crossref]

Lang, R. J.

H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
[Crossref]

Lew, H.

H. Lew, Phys. Rev. 89, 530 (1953).
[Crossref]

Lindgren, I.

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).
[Crossref]

McNally, J. R.

N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
[Crossref]

Racah, G.

Rosen, N.

N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
[Crossref]

Russell, H. N.

H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
[Crossref]

A. G. Shenstone, J. C. Boyce, and H. N. Russell, Rydberg Interpolation Table, Princeton, 1934.

Sarup, R.

G. H. Dieke and R. Sarup, J. Chem. Phys. 29, 741 (1958).
[Crossref]

Shenstone, A. G.

A. G. Shenstone, J. C. Boyce, and H. N. Russell, Rydberg Interpolation Table, Princeton, 1934.

Trees, R. E.

R. E. Trees, Phys. Rev. 84, 1089 (1951).
[Crossref]

R. E. Trees (to be published).

Ark. Fysik. (1)

K. Bockasten, Ark. Fysik. 9, 457 (1955).

J. Chem. Phys. (1)

G. H. Dieke and R. Sarup, J. Chem. Phys. 29, 741 (1958).
[Crossref]

J. Opt. Soc. Am. (3)

Phys. Rev. (6)

N. Rosen, G. R. Harrison, and J. R. McNally, Phys. Rev. 10, 722 (1941).
[Crossref]

H. N. Russell, R. B. King, and R. J. Lang, Phys. Rev. 52, 456 (1937).
[Crossref]

H. Lew, Phys. Rev. 89, 530 (1953).
[Crossref]

S. Goudsmit and R. F. Bacher, Phys. Rev. 34, 1501 (1929).
[Crossref]

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).
[Crossref]

R. E. Trees, Phys. Rev. 84, 1089 (1951).
[Crossref]

Physica (1)

P. F. A. Klinkenberg, Physica 16, 618 (1950).
[Crossref]

Other (5)

H. M. Crosswhite, (1958).

E. H. Carlson and H. M. Crosswhite, (1960).

R. E. Trees (to be published).

A. G. Shenstone, J. C. Boyce, and H. N. Russell, Rydberg Interpolation Table, Princeton, 1934.

B. W. Bryant, (1961).

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Figures (7)

Fig. 1
Fig. 1

The praseodymium spectrum with different degrees of excitation. A, hot spark; B, mild spark; C, arc. Lines marked by four or three dots above the spectra belong to Pr iv or Pr iii, respectively; those with two dots below belong to Pr ii or Pr i.

Fig. 2
Fig. 2

Spark electrode assembly. Lavite electrode spacer is rotated 90° from operating position to show spark channel.

Fig. 3
Fig. 3

The 4f26s configuration of Ce ii and Pr iii compared with 4f2 levels of Pr iv. Ce ii diagram is expanded by factor of 1.4 to match Pr iii and Pr iv scale. Scale numbers are real only for Pr iii level positions.

Fig. 4
Fig. 4

The 4 f 2 6 p configuration of Pr iii, showing groups of two and four levels in J1j-coupling.

Fig. 5
Fig. 5

The 4f3 configuration of Pr iii. Only the 2F7/2 level is missing in the range shown.

Fig. 6
Fig. 6

The 4f25d configuration of Pr iii. The only missing levels in the range shown are drawn in with clashed lines at theoretical positions.

Fig. 7
Fig. 7

Low-lying and intermediate electron configurations for Pr iii. Not all of these have been found experimentally.

Tables (3)

Tables Icon

Table I Energy levels of Pr iii, 4f26s configuration.

Tables Icon

Table II Energy levels of Pr iii, odd parity.

Tables Icon

Table III Energy levels of Pr iii, even parity.

Equations (4)

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Γ = a s · I = a s I cos ( s I ) = a s I cos ( s J ) cos ( J I ) = a s I [ J ( J + 1 ) + s ( s + 1 ) J 1 ( J 1 + 1 ) ] [ F ( F + 1 ) J ( J + 1 ) I ( I + 1 ) ] / 4 J ( J + 1 ) ,
a = 0.46 ± 0.0 2 cm 1
F 2 = 317.4 , ζ = 756.5 , F 4 / F 2 = 0.159 , α = 16.1 , G 3 = 319.2.
Limit ( cm 1 ) Pr 3 + intervals 3 H 4 187 682 3 H 5 189 377 3 H 6 191 377 2171 2103 Average i . p . = 187 330 = 23.2 V .