Phys. Rev. Lett. 99, 113005 (2007) [4 pages]Alignment of a Molecular Anion via a Shape Resonance in Near-Threshold PhotodetachmentReceived 14 March 2007; published 14 September 2007 One-color–two-photon photodetachment of HOCO- at Ehν=1.60 eV accompanied by a measurement of the photoelectron angular distribution (PAD) is used to illustrate a novel approach to the alignment of a molecular anion. A quantitative analysis of the PAD reveals this alignment process is associated with a temporary anion formed by a p-wave shape resonance and the PAD in the two-photon signal is a result of interfering s- and d-partial waves within the atomic approximation. The extracted intensity and phase shift of the partial waves are consistent with the Wigner threshold law for photodetachment. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.113005
DOI:
10.1103/PhysRevLett.99.113005
PACS:
33.80.Eh, 33.60.-q, 33.80.Rv
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