Abstract

Delayed photodesorption of Na atoms from large, surface-bound Na clusters is investigated with a novel technique that includes pulsed plasmon excitation and continuous Doppler-free two-photon evanescent wave detection of desorbing atoms. The spatial confinement of the laser beams within the evanescent wave, the Doppler-free nature of the detection mode, and an accurate evaluation of the kinetic energy of the desorbing atoms in terms of a multiphonon time-of-flight distribution allows temporal information on the decay mechanisms within the cluster to be obtained.

© 1996 Optical Society of America

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References

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  1. W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
    [CrossRef]
  2. F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
    [CrossRef]
  3. F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
    [CrossRef]
  4. J. R. Manson, M. Renger, H.-G. Rubahn, “Subthermal kinetic energy distributions of neutral atoms photodesorbed from Na cluster surfaces,” submitted to Phys. Lett.
  5. H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Berlin, 1988).
  6. I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
    [CrossRef]
  7. J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
    [CrossRef]
  8. G. Comsa, R. David, Surf. Sci. Rep. 5, 145 (1985).
    [CrossRef]
  9. O. S. Heavens, J. Opt. Soc. Am. 51, 1058 (1961).
    [CrossRef]
  10. C. Henkel, Diplom Thesis (University of Göttingen, Göttingen, Germany, 1996).

1994 (1)

F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
[CrossRef]

1993 (3)

I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
[CrossRef]

W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
[CrossRef]

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

1990 (1)

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

1985 (1)

G. Comsa, R. David, Surf. Sci. Rep. 5, 145 (1985).
[CrossRef]

1961 (1)

Arakawa, E. T.

I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
[CrossRef]

Balzer, F.

F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
[CrossRef]

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

Calcott, T. A.

I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
[CrossRef]

Comsa, G.

G. Comsa, R. David, Surf. Sci. Rep. 5, 145 (1985).
[CrossRef]

David, R.

G. Comsa, R. David, Surf. Sci. Rep. 5, 145 (1985).
[CrossRef]

Hartmann, M.

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

Heavens, O. S.

Henkel, C.

C. Henkel, Diplom Thesis (University of Göttingen, Göttingen, Germany, 1996).

Hoheisel, W.

W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
[CrossRef]

Kowalski, J.

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

Lee, I.

I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
[CrossRef]

Manson, J. R.

J. R. Manson, M. Renger, H.-G. Rubahn, “Subthermal kinetic energy distributions of neutral atoms photodesorbed from Na cluster surfaces,” submitted to Phys. Lett.

Raether, H.

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Berlin, 1988).

Renger, M.

F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
[CrossRef]

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

J. R. Manson, M. Renger, H.-G. Rubahn, “Subthermal kinetic energy distributions of neutral atoms photodesorbed from Na cluster surfaces,” submitted to Phys. Lett.

Rubahn, H.-G.

F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
[CrossRef]

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

J. R. Manson, M. Renger, H.-G. Rubahn, “Subthermal kinetic energy distributions of neutral atoms photodesorbed from Na cluster surfaces,” submitted to Phys. Lett.

Stehlin, T.

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

Träger, F.

W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
[CrossRef]

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

Vollmer, M.

W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
[CrossRef]

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

J. Opt. Soc. Am. (1)

Phase Trans. (1)

J. Kowalski, T. Stehlin, F. Träger, M. Vollmer, Phase Trans. 24, 737 (1990).
[CrossRef]

Phys. Rev. B (2)

I. Lee, T. A. Calcott, E. T. Arakawa, Phys. Rev. B 47, 6661 (1993).
[CrossRef]

W. Hoheisel, M. Vollmer, F. Träger, Phys. Rev. B 48, 17463 (1993).
[CrossRef]

Proc. SPIE (1)

F. Balzer, M. Renger, H.-G. Rubahn, Proc. SPIE 2125, 207 (1994).
[CrossRef]

Surf. Sci. Rep. (1)

G. Comsa, R. David, Surf. Sci. Rep. 5, 145 (1985).
[CrossRef]

Z. Phys. D (1)

F. Balzer, M. Hartmann, M. Renger, H.-G. Rubahn, Z. Phys. D 28321 (1993).
[CrossRef]

Other (3)

J. R. Manson, M. Renger, H.-G. Rubahn, “Subthermal kinetic energy distributions of neutral atoms photodesorbed from Na cluster surfaces,” submitted to Phys. Lett.

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Berlin, 1988).

C. Henkel, Diplom Thesis (University of Göttingen, Göttingen, Germany, 1996).

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Figures (2)

Fig. 1
Fig. 1

Experimental setup. The glass prism is mounted in an ultrahigh-vacuum chamber and is irradiated by the desorption (d) and detection (1 and 2) lasers, as indicated. The critical angle is θc = 41.3°, whereas the angles of the lasers with respect to the surface normal are given in the text. The exponentially decaying electromagnetic field intensity defines an effective detection length Δz = 245 nm normal to the surface. On the surface the detection region is ~1 mm2. A level diagram on the right-hand side illustrates the optical absorption and fluorescence processes.

Fig. 2
Fig. 2

(a) Measured TOF curve for pulsed-laser-induced desorption of Na atoms from Na clusters in the evanescent wave field of a prism. The solid curve is a theoretical curve, as discussed in the text, assuming negligible delay between photon excitation and atom desorption. (b) Same as (a), but here we have calculated the solid curve assuming a delay of 50 ns. The dotted curve is the result for a Maxwellian distribution.

Equations (5)

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L = λ 2 π 1 ( n 1 2 sin 2 θ i 1 ) 1 / 2 ,
d 3 R M B d E f d Ω f cos θ f υ f exp ( m υ f 2 2 k B T S ) ,
d 3 R d t d υ x d υ y υ f t υ z d 3 R d E f d Ω f .
d 2 R d t d υ x z 0 d z exp ( 2 k L z ) 1 z × + d υ y [ υ x 2 + υ y 2 + ( z / t ) 2 ] 1 / 2 d 3 R d E f d Ω f .
d 3 R d E f d Ω f cos θ f υ f 2 d 3 R M - B d E f d Ω f cos 2 θ f υ f exp ( m υ f 2 2 k B T S ) .

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