Non-Resonant Two-Photon Detachment of H^- Ions with 1.17 eV Photons
Abstract
One-photon detachment and two-photon non-resonant excess photon detachment of electrons from the H^- ion (outer-electron binding energy = 0.75 eV) are observed with 1.17 eV laser pulses from a Nd:YAG laser. This apparatus has also been used to study <A HREF=http://www.strauss.lanl.gov/>resonant two-photon detachment</A>(A. Stintz, et al., Phys. Rev. Lett., 70, 2924 (1995)) of H^-. A Penning ion source produces a pulsed 8 μA, 35 keV H^- beam that intersects a laser beam consisting of peak intensities of up to 10^11 W/cm^2 cylindrically focused down to a 13 μm waist in the ion beam direction, creating a high intensity interaction region. The detached electrons are then detected by a time-of-flight apparatus. By rotating the linear polarization angle we studied the angular distribution of the electrons for both 1- and 2-photon detachments. The spectra are modeled to determine the one- and two-photon cross sections and mixing of S and D detachments for the two-photon results.
- Publication:
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APS April Meeting Abstracts
- Pub Date:
- April 1997
- Bibcode:
- 1997APS..APR.E1207G