•  2
    Unambiguous observation of F-atom core-hole localization in CF4 through body-frame photoelectron angular distributions
    with C. W. McCurdy, T. N. Rescigno, C. S. Trevisan, R. R. Lucchese, B. Gaire, A. Menssen, M. S. Schöffler, A. Gatton, J. Neff, P. M. Stammer, J. Rist, S. Eckart, B. Berry, T. Severt, J. Sartor, A. Moradmand, T. Jahnke, A. L. Landers, J. B. Williams, I. Ben-Itzhak, R. Dörner, and A. Belkacem
    © 2017 American Physical Society.A dramatic symmetry breaking in K-shell photoionization of the CF4 molecule in which a core-hole vacancy is created in one of four equivalent fluorine atoms is displayed in the molecular frame angular distribution of the photoelectrons. Observing the photoejected electron in coincidence with an F+ atomic ion after Auger decay is shown to select the dissociation path where the core hole was localized almost exclusively on that atom. A combination of measurements a…Read more
  •  1
    Molecular frame photoelectron angular distributions for core ionization of ethane, carbon tetrafluoride and 1,1-difluoroethylene (review)
    with A. Menssen, C. S. Trevisan, M. S. Schöffler, T. Jahnke, I. Bocharova, F. Sturm, N. Gehrken, B. Gaire, H. Gassert, S. Zeller, J. Voigtsberger, A. Kuhlins, F. Trinter, A. Gatton, J. Sartor, D. Reedy, C. Nook, B. Berry, M. Zohrabi, A. Kalinin, I. Ben-Itzhak, A. Belkacem, R. Dörner, A. L. Landers, T. N. Rescigno, C. W. McCurdy, and J. B. Williams
    © 2016 IOP Publishing Ltd.Molecular frame photoelectron angular distributions are measured in electron-ion momentum imaging experiments and compared with complex Kohn variational calculations for carbon K-shell ionization of carbon tetrafluoride, ethane and 1,1-difluoroethylene. While in ethane the polarization averaged MFPADs show a tendency at low energies for the photoelectron to be emitted in the directions of the bonds, the opposite effect is seen in CF4. A combination of these behaviors is…Read more
  •  4
    Consciousness, Neural Basis of
    with Hakwan Lau
    International Encyclopedia of the Social and Behavioral Sciences (2nd Edition). 2015.
    In this entry we give an overview of the search for the neural correlates of consciousness (NCCs). We begin with a discussion of the conceptual complexities of defining the notion of an NCC. We then discuss some of the experimental approaches used to empirically investigate the NCCs. We then consider some competing views of NCCs. Finally, we consider how the competing views of NCCs bear on different theories of consciousness. We focus on the methodological and theoretical challenges facing this …Read more