Abstract

Radiative lifetimes for 63 odd-parity energy levels of neutral lanthanum, in the range 13,26030,965cm1, have been measured using time-resolved laser-induced fluorescence technique in a supersonic free-jet produced by laser vaporization of lanthanum metal. To the best of our knowledge, lifetimes for 45 levels are reported for the first time. The present lifetimes, with a few exceptions, are found to be in good agreement with the previously reported data. Lifetime values reported in this work fall in the range 9.5 to 313ns and are accurate to ±10%. The levels belong to the 5d6s6p, 4f6s2, 6s26p, 5d26p, and 4f5d6s electronic configurations.

© 2011 Optical Society of America

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  1. E. Biémont and P. Quinet, “Recent advances in the study of lanthanide atoms and ions,” Phys. Scr. T 105, 38–54 (2003).
    [CrossRef]
  2. E. A. D. Hartog, K. A. Bilty, and J. E. Lawler, “Radiative lifetimes of neutral gadolinium,” J. Phys. B 44, 055001 (2011).
    [CrossRef]
  3. J. E. Lawler, “Laser and Fourier transform techniques for the measurement of atomic transition probabilities,” in Lasers, Spectroscopy and New Ideas: A Tribute to Arthur L. Schawlow, W.M.Yen and M.D.Levenson, eds., Springer Series in Optical Sciences (Springer, 1988), Vol.  54, pp. 125–140.
  4. C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities for Spectral lines of Seventy Elements, U.S. National Bureau of Standards Monograph (U.S. Government Printing Office, 1962), Vol.  53, pp. 168–173.
  5. A. Hese, “Experimentelle undersuchung der 5d6s6pz2F5/2,7/2 term im Lanthun I spectrum unter Verwendung von Levelcrossing-Spektroskopie,” Z. Phys. 236, 42–52 (1970).
    [CrossRef]
  6. A. Hese and H. P. Weise, “Optische doppelresonanzuntersuchung der 5d6s6pz2F-terme im lanthan I-spektrum,” Z. Angew. Phys. 30, 170–174 (1970).
  7. A. Hese and G. Büldt, “Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6py2D3/2,5/2-Zuständen des Lanthan I-Spektrums,” Z. Naturforsch. A 25, 1537–1545 (1970).
  8. B. R. Bulos, A. J. Glassman, R. Gupta, and G. W. Moe, “Measurement of the lifetimes of the z2F5/2, z2D3/2, z4G5/2 and y2D3/2 states of lanthanum,” J. Opt. Soc. Am. 68, 842–845 (1978).
    [CrossRef]
  9. N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).
  10. K. B. Blagoev and V. A. Komarovskii, “Lifetimes of levels of neutral and singly ionized lanthanide atoms,” At. Data Nucl. Data Tables 56, 1–40 (1994).
    [CrossRef]
  11. P. S. Doidge, “A compendium and critical review of neutral atom resonance line oscillator strength for atomic absorption analysis,” Spectrochim. Acta, Part B: At. Spectrosc. 50, 209–263(1995).
    [CrossRef]
  12. E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
    [CrossRef]
  13. B. Karaçoban and L. Özdemir, “Energies and lifetimes for some excited levels in La I,” Acta Phys. Pol. A 113, 1609–1618 (2008).
  14. Y. Feng, W. Zhang, B. Kuang, L. Ning, Z. Jiang, and Z. Dai, “Radiative lifetime measurements on odd-parity levels of La I by time-resolved laser spectroscopy,” J. Opt. Soc. Am. B 28, 543–546 (2011).
    [CrossRef]
  15. Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
    [CrossRef]
  16. B. Meng, “The flight-out-of-view effect in radiative lifetime measurements of excited atoms by the method of laser-induced fluorescence,” J. Quant. Spectrosc. Radiat. Transfer 41, 303–305(1989).
    [CrossRef]
  17. S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
    [CrossRef]
  18. W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels-The Rare-Earth Elements, National Standard Reference Data Series, National Bureau of Standards (U.S. Department of Commerce, 1978), Vol.  60, pp. 27–35.
  19. W. F. Meggers, C. H. Corliss, and B. F. Scribner, Tables of Spectral Line Intensities, Part I—Arranged by Elements, Monograph 145, National Bureau of Standards (U.S. Department of Commerce, 1975), pp. 128–133.
  20. G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
    [CrossRef]
  21. P. Hannaford and R. M. Lowe, “Determination of atomic lifetimes using laser-induced fluorescence from sputtered metal vapor,” Opt. Eng. 22, 532–544 (1983).

2011

2010

S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
[CrossRef]

2009

G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
[CrossRef]

2008

B. Karaçoban and L. Özdemir, “Energies and lifetimes for some excited levels in La I,” Acta Phys. Pol. A 113, 1609–1618 (2008).

2004

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

2003

E. Biémont and P. Quinet, “Recent advances in the study of lanthanide atoms and ions,” Phys. Scr. T 105, 38–54 (2003).
[CrossRef]

1999

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

1995

P. S. Doidge, “A compendium and critical review of neutral atom resonance line oscillator strength for atomic absorption analysis,” Spectrochim. Acta, Part B: At. Spectrosc. 50, 209–263(1995).
[CrossRef]

1994

K. B. Blagoev and V. A. Komarovskii, “Lifetimes of levels of neutral and singly ionized lanthanide atoms,” At. Data Nucl. Data Tables 56, 1–40 (1994).
[CrossRef]

1989

B. Meng, “The flight-out-of-view effect in radiative lifetime measurements of excited atoms by the method of laser-induced fluorescence,” J. Quant. Spectrosc. Radiat. Transfer 41, 303–305(1989).
[CrossRef]

1985

N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).

1983

P. Hannaford and R. M. Lowe, “Determination of atomic lifetimes using laser-induced fluorescence from sputtered metal vapor,” Opt. Eng. 22, 532–544 (1983).

1978

1970

A. Hese, “Experimentelle undersuchung der 5d6s6pz2F5/2,7/2 term im Lanthun I spectrum unter Verwendung von Levelcrossing-Spektroskopie,” Z. Phys. 236, 42–52 (1970).
[CrossRef]

A. Hese and H. P. Weise, “Optische doppelresonanzuntersuchung der 5d6s6pz2F-terme im lanthan I-spektrum,” Z. Angew. Phys. 30, 170–174 (1970).

A. Hese and G. Büldt, “Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6py2D3/2,5/2-Zuständen des Lanthan I-Spektrums,” Z. Naturforsch. A 25, 1537–1545 (1970).

Basar, G.

G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
[CrossRef]

G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
[CrossRef]

Bhattacharyya, S.

S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
[CrossRef]

Biémont, E.

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

E. Biémont and P. Quinet, “Recent advances in the study of lanthanide atoms and ions,” Phys. Scr. T 105, 38–54 (2003).
[CrossRef]

Bilty, K. A.

E. A. D. Hartog, K. A. Bilty, and J. E. Lawler, “Radiative lifetimes of neutral gadolinium,” J. Phys. B 44, 055001 (2011).
[CrossRef]

Blagoev, K. B.

K. B. Blagoev and V. A. Komarovskii, “Lifetimes of levels of neutral and singly ionized lanthanide atoms,” At. Data Nucl. Data Tables 56, 1–40 (1994).
[CrossRef]

Bozman, W. R.

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities for Spectral lines of Seventy Elements, U.S. National Bureau of Standards Monograph (U.S. Government Printing Office, 1962), Vol.  53, pp. 168–173.

Büldt, G.

A. Hese and G. Büldt, “Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6py2D3/2,5/2-Zuständen des Lanthan I-Spektrums,” Z. Naturforsch. A 25, 1537–1545 (1970).

Bulos, B. R.

Corliss, C. H.

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities for Spectral lines of Seventy Elements, U.S. National Bureau of Standards Monograph (U.S. Government Printing Office, 1962), Vol.  53, pp. 168–173.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, Tables of Spectral Line Intensities, Part I—Arranged by Elements, Monograph 145, National Bureau of Standards (U.S. Department of Commerce, 1975), pp. 128–133.

Dai, Z.

Doidge, P. S.

P. S. Doidge, “A compendium and critical review of neutral atom resonance line oscillator strength for atomic absorption analysis,” Spectrochim. Acta, Part B: At. Spectrosc. 50, 209–263(1995).
[CrossRef]

Feng, Y.

Glassman, A. J.

Gorshkov, V. N.

N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).

Gupta, R.

Hagan, L.

W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels-The Rare-Earth Elements, National Standard Reference Data Series, National Bureau of Standards (U.S. Department of Commerce, 1978), Vol.  60, pp. 27–35.

Hannaford, P.

P. Hannaford and R. M. Lowe, “Determination of atomic lifetimes using laser-induced fluorescence from sputtered metal vapor,” Opt. Eng. 22, 532–544 (1983).

Hartog, E. A. D.

E. A. D. Hartog, K. A. Bilty, and J. E. Lawler, “Radiative lifetimes of neutral gadolinium,” J. Phys. B 44, 055001 (2011).
[CrossRef]

Hese, A.

A. Hese and H. P. Weise, “Optische doppelresonanzuntersuchung der 5d6s6pz2F-terme im lanthan I-spektrum,” Z. Angew. Phys. 30, 170–174 (1970).

A. Hese, “Experimentelle undersuchung der 5d6s6pz2F5/2,7/2 term im Lanthun I spectrum unter Verwendung von Levelcrossing-Spektroskopie,” Z. Phys. 236, 42–52 (1970).
[CrossRef]

A. Hese and G. Büldt, “Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6py2D3/2,5/2-Zuständen des Lanthan I-Spektrums,” Z. Naturforsch. A 25, 1537–1545 (1970).

Jiang, Z.

Karaçoban, B.

B. Karaçoban and L. Özdemir, “Energies and lifetimes for some excited levels in La I,” Acta Phys. Pol. A 113, 1609–1618 (2008).

Komarovskii, V. A.

K. B. Blagoev and V. A. Komarovskii, “Lifetimes of levels of neutral and singly ionized lanthanide atoms,” At. Data Nucl. Data Tables 56, 1–40 (1994).
[CrossRef]

N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).

Kröger, S.

G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
[CrossRef]

Kuang, B.

Lawler, J. E.

E. A. D. Hartog, K. A. Bilty, and J. E. Lawler, “Radiative lifetimes of neutral gadolinium,” J. Phys. B 44, 055001 (2011).
[CrossRef]

J. E. Lawler, “Laser and Fourier transform techniques for the measurement of atomic transition probabilities,” in Lasers, Spectroscopy and New Ideas: A Tribute to Arthur L. Schawlow, W.M.Yen and M.D.Levenson, eds., Springer Series in Optical Sciences (Springer, 1988), Vol.  54, pp. 125–140.

Li, Z.-S.

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Lowe, R. M.

P. Hannaford and R. M. Lowe, “Determination of atomic lifetimes using laser-induced fluorescence from sputtered metal vapor,” Opt. Eng. 22, 532–544 (1983).

Martin, W. C.

W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels-The Rare-Earth Elements, National Standard Reference Data Series, National Bureau of Standards (U.S. Department of Commerce, 1978), Vol.  60, pp. 27–35.

Meggers, W. F.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, Tables of Spectral Line Intensities, Part I—Arranged by Elements, Monograph 145, National Bureau of Standards (U.S. Department of Commerce, 1975), pp. 128–133.

Meng, B.

B. Meng, “The flight-out-of-view effect in radiative lifetime measurements of excited atoms by the method of laser-induced fluorescence,” J. Quant. Spectrosc. Radiat. Transfer 41, 303–305(1989).
[CrossRef]

Moe, G. W.

Mukund, S.

S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
[CrossRef]

Nakhate, S. G.

S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
[CrossRef]

Ning, L.

Norin, J.

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Özdemir, L.

B. Karaçoban and L. Özdemir, “Energies and lifetimes for some excited levels in La I,” Acta Phys. Pol. A 113, 1609–1618 (2008).

Penkin, N. P.

N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).

Persson, A.

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Quinet, P.

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

E. Biémont and P. Quinet, “Recent advances in the study of lanthanide atoms and ions,” Phys. Scr. T 105, 38–54 (2003).
[CrossRef]

Scribner, B. F.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, Tables of Spectral Line Intensities, Part I—Arranged by Elements, Monograph 145, National Bureau of Standards (U.S. Department of Commerce, 1975), pp. 128–133.

Svanberg, S.

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Wahlström, C.-G.

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Weise, H. P.

A. Hese and H. P. Weise, “Optische doppelresonanzuntersuchung der 5d6s6pz2F-terme im lanthan I-spektrum,” Z. Angew. Phys. 30, 170–174 (1970).

Xu, H. L.

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

Zalubas, R.

W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels-The Rare-Earth Elements, National Standard Reference Data Series, National Bureau of Standards (U.S. Department of Commerce, 1978), Vol.  60, pp. 27–35.

Zhang, W.

Acta Phys. Pol. A

B. Karaçoban and L. Özdemir, “Energies and lifetimes for some excited levels in La I,” Acta Phys. Pol. A 113, 1609–1618 (2008).

At. Data Nucl. Data Tables

K. B. Blagoev and V. A. Komarovskii, “Lifetimes of levels of neutral and singly ionized lanthanide atoms,” At. Data Nucl. Data Tables 56, 1–40 (1994).
[CrossRef]

Eur. Phys. J. D

E. Biémont, P. Quinet, S. Svanberg, and H. L. Xu, “Lifetime measurements and calculations in La I,” Eur. Phys. J. D 30, 157–162 (2004).
[CrossRef]

J. Opt. Soc. Am.

J. Opt. Soc. Am. B

J. Phys. B

E. A. D. Hartog, K. A. Bilty, and J. E. Lawler, “Radiative lifetimes of neutral gadolinium,” J. Phys. B 44, 055001 (2011).
[CrossRef]

J. Quant. Spectrosc. Radiat. Transfer

B. Meng, “The flight-out-of-view effect in radiative lifetime measurements of excited atoms by the method of laser-induced fluorescence,” J. Quant. Spectrosc. Radiat. Transfer 41, 303–305(1989).
[CrossRef]

S. G. Nakhate, S. Mukund, and S. Bhattacharyya, “Radiative lifetime measurements in neutral zirconium using time-resolved laser induced fluorescence in supersonic free-jet,” J. Quant. Spectrosc. Radiat. Transfer 111, 394–398 (2010).
[CrossRef]

Opt. Commun.

G. Başar, G. Başar, and S. Kröger, “High resolution measurements of the hyperfine structure of atomic lanthanum for energetically low lying levels of odd parity,” Opt. Commun. 282, 562–567 (2009).
[CrossRef]

Opt. Eng.

P. Hannaford and R. M. Lowe, “Determination of atomic lifetimes using laser-induced fluorescence from sputtered metal vapor,” Opt. Eng. 22, 532–544 (1983).

Opt. Spectrosc.

N. P. Penkin, V. N. Gorshkov, and V. A. Komarovskii, “Radiative lifetimes of excited La I levels,” Opt. Spectrosc. 58, 840–841(1985).

Phys. Rev. A

Z.-S. Li, J. Norin, A. Persson, C.-G. Wahlström, and S. Svanberg, “Radiative properties of natural germanium obtained from excited-state lifetime and branching-ratio measurements and comparison with theoretical calculations,” Phys. Rev. A 60, 198–208 (1999).
[CrossRef]

Phys. Scr. T

E. Biémont and P. Quinet, “Recent advances in the study of lanthanide atoms and ions,” Phys. Scr. T 105, 38–54 (2003).
[CrossRef]

Spectrochim. Acta, Part B: At. Spectrosc.

P. S. Doidge, “A compendium and critical review of neutral atom resonance line oscillator strength for atomic absorption analysis,” Spectrochim. Acta, Part B: At. Spectrosc. 50, 209–263(1995).
[CrossRef]

Z. Angew. Phys.

A. Hese and H. P. Weise, “Optische doppelresonanzuntersuchung der 5d6s6pz2F-terme im lanthan I-spektrum,” Z. Angew. Phys. 30, 170–174 (1970).

Z. Naturforsch. A

A. Hese and G. Büldt, “Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6py2D3/2,5/2-Zuständen des Lanthan I-Spektrums,” Z. Naturforsch. A 25, 1537–1545 (1970).

Z. Phys.

A. Hese, “Experimentelle undersuchung der 5d6s6pz2F5/2,7/2 term im Lanthun I spectrum unter Verwendung von Levelcrossing-Spektroskopie,” Z. Phys. 236, 42–52 (1970).
[CrossRef]

Other

J. E. Lawler, “Laser and Fourier transform techniques for the measurement of atomic transition probabilities,” in Lasers, Spectroscopy and New Ideas: A Tribute to Arthur L. Schawlow, W.M.Yen and M.D.Levenson, eds., Springer Series in Optical Sciences (Springer, 1988), Vol.  54, pp. 125–140.

C. H. Corliss and W. R. Bozman, Experimental Transition Probabilities for Spectral lines of Seventy Elements, U.S. National Bureau of Standards Monograph (U.S. Government Printing Office, 1962), Vol.  53, pp. 168–173.

W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels-The Rare-Earth Elements, National Standard Reference Data Series, National Bureau of Standards (U.S. Department of Commerce, 1978), Vol.  60, pp. 27–35.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, Tables of Spectral Line Intensities, Part I—Arranged by Elements, Monograph 145, National Bureau of Standards (U.S. Department of Commerce, 1975), pp. 128–133.

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Figures (3)

Fig. 1
Fig. 1

Schematics of the experimental setup.

Fig. 2
Fig. 2

Typical time-resolved fluorescence decay signal for the 13 , 631.04 cm 1 level (circles). The solid curve represents an exponential fit that gave a lifetime value of 224.5 ns .

Fig. 3
Fig. 3

Typical time-resolved fluorescence decay signal for the 20 , 018.99 cm 1 level (circles). Triangles show recorded excitation laser pulse and the solid curve represents the convolution fit of the laser pulse and exponential decay function that gave a lifetime value of 17.0 ns .

Tables (1)

Tables Icon

Table 1 Radiative Lifetimes for 63 Odd-Parity Levels of La I

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