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AbstractAbstract
[en] Recently broadly tunable, coherent VUV radiation down to 111 nm has become available. An experiment is underway using a VUV light source capable of a few μJ per 10 ns pulse to study the spectrum of H in the region of 113 nm. The photon energy of the VUV can be easily tuned and may determine whether the shape resonance has a Fano profile as predicted. A non-relativistic (35 keV), low-emittance H- beam from the GTA injector at LANL will be used as the ion source. The electrons ejected from the intersecting beams will be analyzed using an electron time-of-flight (TOF) spectrometer. A narrow VUV linewidth allows the width of the Feshbach and shape resonances to be measured to high resolution (∼1 cm-1). The branching ratios of neutral hydrogen states H(1s), H(2s), H(2p) for each resonance will be calculated by measuring the TOF of the ejected electrons. Of particular interest is the differential of the H(2s) and H(2p) branching ratios, since the product states are nearly degenerate in energy. Simulation of TOF data allows determination of both energy and the angular distribution of the electrons, thus permitting the authors to distinguish all three product states
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27. annual meeting of the Division of Atomic, Molecular and Optical Physics (DAMOP) of the American Physical Society (APS); Ann Arbor, MI (United States); 15-18 May 1996; CONF-9605105--
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