Experimental Evidence that the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>6</mn><mi mathvariant="italic">s</mi><mn>6</mn><mi mathvariant="italic">p</mi><mrow><msup><mrow><mi></mi></mrow><mrow><mn>3</mn></mrow></msup></mrow><mrow><msub><mrow><mi mathvariant="italic">P</mi></mrow><mrow><mi mathvariant="italic">J</mi></mrow></msub></mrow></math></span> States of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>Cs</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span> Are Shape Resonances

M. Scheer; J. Thøgersen; R. C. Bilodeau; C. A. Brodie; H. K. Haugen; H. H. Andersen; P. Kristensen; T. Andersen

doi:10.1103/PhysRevLett.80.684

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Experimental Evidence that the $6 s 6 p^{3} P_{J}$ States of ${Cs}^{-}$ Are Shape Resonances

M. Scheer, J. Thøgersen^*, R. C. Bilodeau, C. A. Brodie, and H. K. Haugen^†

H. H. Andersen, P. Kristensen, and T. Andersen

Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada

Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

^*Present address: Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
^†Also with the Department of Engineering, the Brockhouse Institute for Materials Research, and the Center for Electrophotonic Materials and Devices.

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Phys. Rev. Lett. 80, 684 – Published 26 January, 1998

DOI: https://doi.org/10.1103/PhysRevLett.80.684

Abstract

An experimental study of the previously unobserved and controversial ${Cs}^{-} (6 s 6 p {}^{3}P_{J}^{o})$ states has been conducted using a combination of infrared laser and storage ring experiments. This first application of photodetachment spectroscopy to the study of low-lying resonances in atomic negative ions has resulted in the observation of a narrow resonance structure, lying only 8.0(3) meV above the first detachment threshold of ${Cs}^{-}$ . The storage ring experiments suggest that all fine structure levels of the $6 s 6 p$ configuration are unbound, thereby eliminating possibly the only serious candidate for a stable atomic negative ion with opposite parity bound states.

References (24)

D. R. Bates, Adv. At. Mol. Opt. Phys. 27, 1 (1991); T. Andersen, Phys. Scr. T34, 23 (1991); S. J. Buckmann and C. W. Clark, Rev. Mod. Phys. 66, 539 (1994); C. Blondel, Phys. Scr. T58, 31 (1995).
A. E. Litherland, Annu. Rev. Nucl. Part. Sci. 30, 437 (1980); W. Kutschera and M. Paul, 40, 411 (1990).
S. J. Buckman and C. W. Clark, Rev. Mod. Phys. 66, 539 (1994).
D. H. Lee, W. D. Brandon, D. Hanstorp, and D. J. Pegg, Phys. Rev. A 53, R633 (1996).
T. A. Patterson, H. Hotop, A. Kasdan, D. W. Norcross, and W. C. Lineberger, Phy. Rev. Lett. 32, 189 (1974); J. Slater, F. H. Read, S. E. Novick, and W. C. Lineberger, Phys. Rev. A 17, 201 (1978).
C. H. Greene, Phys. Rev. A 42, 1405 (1990).
H. Stapelfeldt and H. K. Haugen, Phys. Rev. Lett. 69, 2638 (1992); H. Stapelfeldt, P. Kristensen, U. Ljungblad, T. Andersen, and H. K. Haugen, Phys. Rev. A 50,1618 (1994).
I. I. Fabrikant, Opt. Spectrosc. 53, 131 (1982) [Opt. Spektrosk. 53, 223 (1982)].
J. L. Krause and R. S. Berry, Comments At. Mol. Phys. 18, 91 (1986).
C. Froese Fischer and D. Chen, J. Mol. Struct. 199, 61 (1989).
U. Thumm and D. W. Norcross, Phys. Rev. Lett. 67, 3495 (1991); Phys. Rev. A 45, 6349 (1992); 47, 305 (1993).
N. S. Scott, K. Bartschat, P. G. Burke, O. Nagy, and W. B. Eissner, J. Phys. B 17, 3755 (1984); P. G. Burke and J. F. B. Mitchell, 6, L161 (1973).
K. Bartschat, J. Phys. B 26, 3595 (1993).
L. H. Andersen et al., Phys. Lett. A 162, 336 (1992).
J. Thøgersen, L. D. Steele, M. Scheer, C. A. Brodie, and H. K. Haugen, J. Phys. B 29, 1323 (1996).
M. Scheer, C. A. Brodie, R. C. Bilodeau, and H. K. Haugen (to be published).
W. P. Wijesundera and A. E. Litherland (private communication).
J. Thøgersen, M. Scheer, L. D. Steele, H. K. Haugen, and W. P. Wijesundera, Phys. Rev. Lett. 76, 2870 (1996).
H. Hotop and W. C. Lineberger, J. Phys. Chem. Ref. Data 14, 731 (1985).
H. K. Haugen et al., Phys. Rev. A 46, R1 (1992).
M.-J. Nadeau and A. E. Litherland, Nucl. Instrum. Methods Phys. Res., Sect. B 52, 387 (1990); V. A. Oparin, R. N. Il'in, I. T. Serenkov, and E. S. Solov'ev, Sov. Phys. JETP 39, 989 (1974) [Zh. Eksp. Teor. Fiz. 66, 2008 (1974)].
Theoretical studies of the negative ions of some lanthanides and actinides seem to indicate the possibility of opposite parity bound states in these complex systems; S. H. Vosko, J. B. Lagowski, I. L. Mayer, and J. A. Chevary, Phys. Rev. A 43, 6389 (1991); D. Datta and D. R. Beck, 50, 1107 (1994); K. Dinov, D. R. Beck, and D. Datta, 50, 1144 (1994).
K. Bartschat, A. R. Johnston, and P. D. Burrow, J. Phys. B 27, L231 (1994).
T. Lee, T.-L. Ku, H. L. Lu, and J.-C. Chen, Geochim. Cosmochim Acta 57, 3493 (1993).

[c1] D. R. Bates, Adv. At. Mol. Opt. Phys. 27, 1 (1991); T. Andersen, Phys. Scr. T34, 23 (1991); S. J. Buckmann and C. W. Clark, Rev. Mod. Phys. 66, 539 (1994); C. Blondel, Phys. Scr. T58, 31 (1995).

[c2] A. E. Litherland, Annu. Rev. Nucl. Part. Sci. 30, 437 (1980); W. Kutschera and M. Paul, 40, 411 (1990).

[c3] S. J. Buckman and C. W. Clark, Rev. Mod. Phys. 66, 539 (1994).

[c4] D. H. Lee, W. D. Brandon, D. Hanstorp, and D. J. Pegg, Phys. Rev. A 53, R633 (1996).

[c5] T. A. Patterson, H. Hotop, A. Kasdan, D. W. Norcross, and W. C. Lineberger, Phy. Rev. Lett. 32, 189 (1974); J. Slater, F. H. Read, S. E. Novick, and W. C. Lineberger, Phys. Rev. A 17, 201 (1978).

[c6] C. H. Greene, Phys. Rev. A 42, 1405 (1990).

[c7] H. Stapelfeldt and H. K. Haugen, Phys. Rev. Lett. 69, 2638 (1992); H. Stapelfeldt, P. Kristensen, U. Ljungblad, T. Andersen, and H. K. Haugen, Phys. Rev. A 50,1618 (1994).

[c8] I. I. Fabrikant, Opt. Spectrosc. 53, 131 (1982) [Opt. Spektrosk. 53, 223 (1982)].

[c9] J. L. Krause and R. S. Berry, Comments At. Mol. Phys. 18, 91 (1986).

[c10] C. Froese Fischer and D. Chen, J. Mol. Struct. 199, 61 (1989).

[c11] U. Thumm and D. W. Norcross, Phys. Rev. Lett. 67, 3495 (1991); Phys. Rev. A 45, 6349 (1992); 47, 305 (1993).

[c12] N. S. Scott, K. Bartschat, P. G. Burke, O. Nagy, and W. B. Eissner, J. Phys. B 17, 3755 (1984); P. G. Burke and J. F. B. Mitchell, 6, L161 (1973).

[c13] K. Bartschat, J. Phys. B 26, 3595 (1993).

[c14] L. H. Andersen et al., Phys. Lett. A 162, 336 (1992).

[c15] J. Thøgersen, L. D. Steele, M. Scheer, C. A. Brodie, and H. K. Haugen, J. Phys. B 29, 1323 (1996).

[c16] M. Scheer, C. A. Brodie, R. C. Bilodeau, and H. K. Haugen (to be published).

[c17] W. P. Wijesundera and A. E. Litherland (private communication).

[c18] J. Thøgersen, M. Scheer, L. D. Steele, H. K. Haugen, and W. P. Wijesundera, Phys. Rev. Lett. 76, 2870 (1996).

[c19] H. Hotop and W. C. Lineberger, J. Phys. Chem. Ref. Data 14, 731 (1985).

[c20] H. K. Haugen et al., Phys. Rev. A 46, R1 (1992).

[c21] M.-J. Nadeau and A. E. Litherland, Nucl. Instrum. Methods Phys. Res., Sect. B 52, 387 (1990); V. A. Oparin, R. N. Il'in, I. T. Serenkov, and E. S. Solov'ev, Sov. Phys. JETP 39, 989 (1974) [Zh. Eksp. Teor. Fiz. 66, 2008 (1974)].

[c22] Theoretical studies of the negative ions of some lanthanides and actinides seem to indicate the possibility of opposite parity bound states in these complex systems; S. H. Vosko, J. B. Lagowski, I. L. Mayer, and J. A. Chevary, Phys. Rev. A 43, 6389 (1991); D. Datta and D. R. Beck, 50, 1107 (1994); K. Dinov, D. R. Beck, and D. Datta, 50, 1144 (1994).

[c23] K. Bartschat, A. R. Johnston, and P. D. Burrow, J. Phys. B 27, L231 (1994).

[c24] T. Lee, T.-L. Ku, H. L. Lu, and J.-C. Chen, Geochim. Cosmochim Acta 57, 3493 (1993).

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Experimental Evidence that the $6 s 6 p^{3} P_{J}$ States of ${Cs}^{-}$ Are Shape Resonances

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Experimental Evidence that the 6s6p3PJ States of Cs− Are Shape Resonances

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References (24)

Experimental Evidence that the $6 s 6 p^{3} P_{J}$ States of ${Cs}^{-}$ Are Shape Resonances