Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths

doi:10.1103/PHYSREVA.75.022711

Title: Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths

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Abstract

Photodetachment cross sections and the angular distributions of photoelectrons produced by the single-photon detachment of the transition metal negative ions Fe{sup -} and Cu{sup -} have been measured at four discrete photon wavelengths ranging from 457.9 to 647.1 nm (2.71-1.92 eV) using a crossed-beams laser photodetachment electron spectrometry (LPES) apparatus. Photodetachment cross sections were determined by comparing the photoelectron yields from the photodetachment of Fe{sup -} to those of Cu{sup -} and C{sup -}, which have known absolute photodetachment cross sections. Using the measured photodetachment cross sections, radiative electron attachment cross sections were calculated using the principle of detailed balance. Angular distributions were determined by measurements of laboratory frame, angle-, and energy-resolved photoelectrons as a function of the angle between the linear laser polarization vector and the momentum vector of the collected photoelectrons. Values of the asymmetry parameter have been determined by nonlinear least-squares fits to these angular distributions. The measured asymmetry parameters are compared to predictions of photodetachment models including Cooper and Zare's dipole approximation theory [J. Cooper and R. N. Zare, J. Chem. Phys. 48, 942 (1968)], and the angular momentum transfer theory developed by Fano and Dill [Phys. Rev. A 6, 185 (1972)].

Authors:

Covington, A. M.; Duvvuri, Srividya S.; Emmons, E. D.; Kraus, R. G.; Williams, W. W.; Thompson, J. S.; Calabrese, D.; Carpenter, D. L.; Collier, R. D.; Kvale, T. J.; Davis, V. T. ^[1]; Department of Physics, Sierra College, Rocklin, California 95677 ^[2]; National Renewable Energy Laboratory, Golden, Colorado 80401-3393 ^[2]; Department of Physics, Western Nevada Community College, Carson City, Nevada 89703 ^[2]; Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606-3390 ^[2]; Test Support Division, Defense Threat Reduction Agency, West Desert Test Center, Dugway, Utah 84022-5000 ^[2]

Department of Physics and Nevada Terawatt Facility, MS 220, University of Nevada, Reno, Nevada 89557-0058 (United States)
(United States)

Publication Date:: Thu Feb 15 00:00:00 EST 2007

OSTI Identifier:: 20982125

Resource Type:: Journal Article

Resource Relation:: Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.75.022711; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; ANGULAR MOMENTUM TRANSFER; APPROXIMATIONS; ASYMMETRY; CARBON IONS; COLLIDING BEAMS; COPPER IONS; CROSS SECTIONS; DIPOLES; ELECTRON ATTACHMENT; ELECTRON DETACHMENT; ELECTRONS; IRON IONS; LEAST SQUARE FIT; NONLINEAR PROBLEMS; PHOTOELECTRON SPECTROSCOPY; PHOTON-ATOM COLLISIONS; PHOTONS; POLARIZATION; WAVELENGTHS

Citation Formats


                    Covington, A. M., Duvvuri, Srividya S., Emmons, E. D., Kraus, R. G., Williams, W. W., Thompson, J. S., Calabrese, D., Carpenter, D. L., Collier, R. D., Kvale, T. J., Davis, V. T., Department of Physics, Sierra College, Rocklin, California 95677, National Renewable Energy Laboratory, Golden, Colorado 80401-3393, Department of Physics, Western Nevada Community College, Carson City, Nevada 89703, Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606-3390, and Test Support Division, Defense Threat Reduction Agency, West Desert Test Center, Dugway, Utah 84022-5000. Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths.  United States: N. p., 2007. 
        Web.  doi:10.1103/PHYSREVA.75.022711.

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                    Covington, A. M., Duvvuri, Srividya S., Emmons, E. D., Kraus, R. G., Williams, W. W., Thompson, J. S., Calabrese, D., Carpenter, D. L., Collier, R. D., Kvale, T. J., Davis, V. T., Department of Physics, Sierra College, Rocklin, California 95677, National Renewable Energy Laboratory, Golden, Colorado 80401-3393, Department of Physics, Western Nevada Community College, Carson City, Nevada 89703, Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606-3390, & Test Support Division, Defense Threat Reduction Agency, West Desert Test Center, Dugway, Utah 84022-5000. Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths.  United States.  doi:10.1103/PHYSREVA.75.022711.

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                    Covington, A. M., Duvvuri, Srividya S., Emmons, E. D., Kraus, R. G., Williams, W. W., Thompson, J. S., Calabrese, D., Carpenter, D. L., Collier, R. D., Kvale, T. J., Davis, V. T., Department of Physics, Sierra College, Rocklin, California 95677, National Renewable Energy Laboratory, Golden, Colorado 80401-3393, Department of Physics, Western Nevada Community College, Carson City, Nevada 89703, Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606-3390, and Test Support Division, Defense Threat Reduction Agency, West Desert Test Center, Dugway, Utah 84022-5000. Thu .  
        "Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths".  United States.  
        doi:10.1103/PHYSREVA.75.022711.

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@article{osti_20982125,

  title        = {Measurements of partial cross sections and photoelectron angular distributions for the photodetachment of Fe{sup -} and Cu{sup -} at visible photon wavelengths},

  author       = {Covington, A. M. and Duvvuri, Srividya S. and Emmons, E. D. and Kraus, R. G. and Williams, W. W. and Thompson, J. S. and Calabrese, D. and Carpenter, D. L. and Collier, R. D. and Kvale, T. J. and Davis, V. T. and Department of Physics, Sierra College, Rocklin, California 95677 and National Renewable Energy Laboratory, Golden, Colorado 80401-3393 and Department of Physics, Western Nevada Community College, Carson City, Nevada 89703 and Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606-3390 and Test Support Division, Defense Threat Reduction Agency, West Desert Test Center, Dugway, Utah 84022-5000},

  abstractNote = {Photodetachment cross sections and the angular distributions of photoelectrons produced by the single-photon detachment of the transition metal negative ions Fe{sup -} and Cu{sup -} have been measured at four discrete photon wavelengths ranging from 457.9 to 647.1 nm (2.71-1.92 eV) using a crossed-beams laser photodetachment electron spectrometry (LPES) apparatus. Photodetachment cross sections were determined by comparing the photoelectron yields from the photodetachment of Fe{sup -} to those of Cu{sup -} and C{sup -}, which have known absolute photodetachment cross sections. Using the measured photodetachment cross sections, radiative electron attachment cross sections were calculated using the principle of detailed balance. Angular distributions were determined by measurements of laboratory frame, angle-, and energy-resolved photoelectrons as a function of the angle between the linear laser polarization vector and the momentum vector of the collected photoelectrons. Values of the asymmetry parameter have been determined by nonlinear least-squares fits to these angular distributions. The measured asymmetry parameters are compared to predictions of photodetachment models including Cooper and Zare's dipole approximation theory [J. Cooper and R. N. Zare, J. Chem. Phys. 48, 942 (1968)], and the angular momentum transfer theory developed by Fano and Dill [Phys. Rev. A 6, 185 (1972)].},

  doi          = {10.1103/PHYSREVA.75.022711},

  journal      = {Physical Review. A},

  number       = 2,

  volume       = 75,

  place        = {United States},

  year         = {Thu Feb 15 00:00:00 EST 2007},

  month        = {Thu Feb 15 00:00:00 EST 2007}

}

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DOI: 10.1103/PHYSREVA.75.022711

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