Substitution effects in strong and ultrastrong field ionization of chlorinated methane

ORAL

Abstract

Intensity dependent yields of carbon and chlorine ion fragments from chlorinated methane species are studied in strong and ultrastrong laser fields. Comparison to carbon ion fragments from methane under similar conditions shows no difference in the ion yields for chloromethane. Methane derived carbon ions display no anisotropy with respect to the laser polarization direction where chloromethane has little or no anisotropy, within the standard of error for our spectrometer. The energy distributions of carbon and chlorine ions are also collected and it is shown that the fragment energy of the highest charge states of carbon can reach energies of 20 eV to 40 eV for C$^{3+}$ and C$^{4+}$ respectively. A previous study of the intensity dependence of carbon ions from methane\footnote{S.Palaniyappan et. al., Phys. Rev. Lett. \textbf{100},183001(2008)} , showed that production of the lowest charge states of carbon, C$^{+}$ and C$^{2+}$ are heavily influenced by molecular ionization effects and that the highest charge states of carbon, C$^{5+}$, show no molecular dependence in its production. The current work details a similar result for the chlorinated methane series.

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Authors

  • Patrick Grugan

    Univ of Delaware, University of Delaware

  • Siyu Luo

    Univ of Delaware, University of Delaware, university of Delaware

  • Shahab Derakhshan

    Drexel University, Univ of Delaware, Princeton University, Naval Surface Warfare Center\Carderock Division\West Bethesda site, Naval Surface Warfare Center and Georgetown Univ., Dept. of Physics and Astronomy, University of Delaware, Dept. of Physics and Astronomy, University of Deleware, Dept. of Physics and Astronomy, University of Nevada-Reno, university of Delaware, Contributors, Department of Physics, Astronomy and Geosciences, Towson University, Choice Research Group, Univ of the Sciences in Philadephia, Rutgers Univ, National Institute of Standards and Technology, Department of Chemistry, West Chester University, West Chester, PA 19383, Bucknell University, Towson University, University of Maryland, College of William and Mary, Naval Research Laboratory, Department of Physics, Villanova University, Department of Chemistry, Faculty of Medicine, University of Brescia, Department of Chemistry, State University of New York at Potsdam, Delaware State University DE, NIH Bethesda MD, Wilmington Friends School DE, University Of Rochester NY, Delaware State University, Department of Physics and Astronomy,West Virginia University, The National Energy Technology Laboratory, Non-tenure track professor at research institution, Government Sponsored Laboratory, Research and Development at Industrial Company, Tenure-track Professor at 4 yr college, Department of Physics and Astronomy and Department of Chemistry and Biochemistry, University of Delaware, Biology and Soft Matter Division, Oak Ridge National Laboratory, and Department of Physics and Astronomy, The University of Tennessee, Biology and Soft Matter Division, Oak Ridge National Laboratory, Lehigh Univ, Johns Hopkins Univ, NIST, GMU, GWU, Lock Haven University of PA, Univ of Maryland-Balt County; Center for Nanoscale Materials, Argonne National Laboratory, Department of Chemistry, Northwestern University, Univ of Maryland-Balt County, Pennsylvania State University, BAE Systems, Inc., Nashua, New Hampshire 03061, Department of Physics, West Virginia University, Morgantown, West Virginia, 26506-6315, California State University, Long Beach

  • Ryan Welch

    Univ of Delaware

  • Barry Walker

    Univ of Delaware, Research Scientist at University Affiliated Laboratory, University of Delaware, U.S. Department of Labor