DOI: 10.1063/1.1679515. Dye-laser photodetachment studies of Au−, Pt−, PtN−, and Ag−

Dye-laser photodetachment studies of Au−, Pt−, PtN−, and Ag−

10.1063/1.1679515

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Photodetachment of Au−, Pt−, PtN−, and Ag− ions is studied in a crossed-beam experiment, in which a 2 keV negative ion beam is intersected by a pulsed tunable dye laser (Δ λ ≈ 1–2 Å). The threshold behavior of the photodetachment cross section σ for Au− and Pt− is found to agree with Wigner's Law σ ∝ k2L+1 (k: momentum of outgoing electron with orbital angular momentum L) over about 50 meV above threshold for this case, in which L=1. The electron affinity of Au is (2.3086 ± 0.0007) eV, that of Pt (2.128 ± 0.002) eV, whereas the one for Ag is &lt;1.78 eV and very probably ≲ 1.5 eV. The PtN− cross section exhibits sharp peaks due to single-photon processes; these features are ascribed either to autodetachment or predissociation of excited long-lived (τ ≳ 5 × 10−13 sec) PtN−* molecules; the present experiment measures the total cross section for the production of neutral atoms (or molecules) and therefore cannot distinguish the two possibilities. Further, saturation experiments are described in which the laser flux is so high as to saturate partially the photodetachment. This method is applied to the case of Pt−, for which the absolute cross section of an excited component Pt−* in the beam is measured and thereby its fractional population is determined.

Bibliography

Hotop, H., & Lineberger, W. C. (1973). Dye-laser photodetachment studies of Auâ, Ptâ, PtNâ, and Agâ. The Journal of Chemical Physics, 58(6), 2379â2387.

Authors 2

H. Hotop (first)
W. C. Lineberger (additional)

References 31 Referenced 128

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{'key': '2024020910213339200_r1a'}
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Dates

Type	When
Created	21 years, 6 months ago (Feb. 4, 2004, 5:30 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 6:20 a.m.)
Indexed	2 weeks, 3 days ago (Aug. 6, 2025, 9:01 a.m.)
Issued	52 years, 5 months ago (March 15, 1973)
Published	52 years, 5 months ago (March 15, 1973)
Published Print	52 years, 5 months ago (March 15, 1973)

Funders 0

None

BibTeX

@article{Hotop_1973, title={Dye-laser photodetachment studies of Au‚àí, Pt‚àí, PtN‚àí, and Ag‚àí}, volume={58}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1679515}, DOI={10.1063/1.1679515}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Hotop, H. and Lineberger, W. C.}, year={1973}, month=mar, pages={2379‚Äì2387} }

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  "abstract": "<jats:p>Photodetachment of Au\u2212, Pt\u2212, PtN\u2212, and Ag\u2212 ions is studied in a crossed-beam experiment, in which a 2 keV negative ion beam is intersected by a pulsed tunable dye laser (\u0394 \u03bb \u2248 1\u20132\u2009\u00c5). The threshold behavior of the photodetachment cross section \u03c3 for Au\u2212 and Pt\u2212 is found to agree with Wigner's Law \u03c3 \u221d k2L+1 (k: momentum of outgoing electron with orbital angular momentum L) over about 50 meV above threshold for this case, in which L=1. The electron affinity of Au is (2.3086 \u00b1 0.0007)\u2009 eV, that of Pt (2.128 \u00b1 0.002)\u2009eV, whereas the one for Ag is &amp;lt;1.78\u2009eV and very probably \u2272 1.5\u2009eV. The PtN\u2212 cross section exhibits sharp peaks due to single-photon processes; these features are ascribed either to autodetachment or predissociation of excited long-lived (\u03c4 \u2273 5 \u00d7 10\u221213\u2009sec) PtN\u2212* molecules; the present experiment measures the total cross section for the production of neutral atoms (or molecules) and therefore cannot distinguish the two possibilities. Further, saturation experiments are described in which the laser flux is so high as to saturate partially the photodetachment. This method is applied to the case of Pt\u2212, for which the absolute cross section of an excited component Pt\u2212* in the beam is measured and thereby its fractional population is determined.</jats:p>",
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