Dr. David Chisnall, FIA

Basingstoke, England, United Kingdom Contact Info
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About

Senior Manager, qualified actuary, PhD graduate, and former Product Owner, with a strong…

Activity

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Experience & Education

  • FIS

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Publications

  • Coupling between diffusion and orientation of pentacene molecules on an organic surface

    Nature Materials 15, 397–400 (2016)

    The realization of efficient organic electronic devices requires the controlled preparation of molecular thin films and heterostructures. As top-down structuring methods such as lithography cannot be applied to van der Waals bound materials1, surface diffusion becomes a structure-determining factor that requires microscopic understanding. Scanning probe techniques provide atomic resolution, but are limited to observations of slow movements, and therefore constrained to low temperatures. In…

    The realization of efficient organic electronic devices requires the controlled preparation of molecular thin films and heterostructures. As top-down structuring methods such as lithography cannot be applied to van der Waals bound materials1, surface diffusion becomes a structure-determining factor that requires microscopic understanding. Scanning probe techniques provide atomic resolution, but are limited to observations of slow movements, and therefore constrained to low temperatures. In contrast, the helium-3 spin-echo (HeSE) technique achieves spatial and time resolution on the nm and ps scale, respectively, thus enabling measurements at elevated temperatures2. Here we use HeSE to unveil the intricate motion of pentacene admolecules diffusing on a chemisorbed monolayer of pentacene on Cu(110) that serves as a stable, well-ordered organic model surface3. We find that pentacene moves along rails parallel and perpendicular to the surface molecules. The experimental data are explained by admolecule rotation that enables a switching between diffusion directions, which extends our molecular level understanding of diffusion in complex organic systems.

    See publication

  • Measurement of the Phason Dispersion of Misfit Dislocations on the Au(111) Surface

    Phys. Rev. Lett. 110, 086103

    We report measurements of the acoustic and optical phason dispersion curves associated with the lattice of partial dislocations on the reconstructed (111) surface of gold. Our measurements of these low energy (<0.5  meV) weakly dispersive modes have been enabled by the very high resolution of the novel helium spin-echo technique. The results presented here constitute the first measurement of the phason dispersion of misfit dislocations, and possibly of excitations associated with any type of…

    We report measurements of the acoustic and optical phason dispersion curves associated with the lattice of partial dislocations on the reconstructed (111) surface of gold. Our measurements of these low energy (<0.5  meV) weakly dispersive modes have been enabled by the very high resolution of the novel helium spin-echo technique. The results presented here constitute the first measurement of the phason dispersion of misfit dislocations, and possibly of excitations associated with any type of crystalline dislocations.

    See publication

Honors & Awards

  • iWorks Award

    SunGard

    "For quickly becoming an SME on Glean late into the project and driving the delivery of a quality product largely unaided."

Test Scores

  • SP1

    Score: Pass

  • SA2

    Score: Pass

  • ST2

    Score: Pass

  • CA3

    Score: Pass

  • CT8

    Score: Pass

  • CT5

    Score: Pass

  • CA1

    Score: Pass

  • CA2

    Score: Pass

  • CT4

    Score: Pass

  • CT9

    Score: Pass

  • CT6

    Score: Pass

  • CT7

    Score: Pass

  • CT1

    Score: Pass

  • CT2

    Score: Pass

  • CT3

    Score: Pass

Organizations

  • SunGard Social Committee

    Member

    - Present

    Responsible for increasing employee engagement by organization and planning of informal company social events. Drawing together ideas from the members of the company, and presenting them at Social Committee meetings. Committee is ultimately also responsible for planning of two large company events per year, including the Christmas party. Responsible for: * Liaising with venue regarding Christmas party, 2013. * Organizing Chertsey photography competition, 2013. * Numerous informal social…

    Responsible for increasing employee engagement by organization and planning of informal company social events. Drawing together ideas from the members of the company, and presenting them at Social Committee meetings. Committee is ultimately also responsible for planning of two large company events per year, including the Christmas party. Responsible for: * Liaising with venue regarding Christmas party, 2013. * Organizing Chertsey photography competition, 2013. * Numerous informal social activities.

  • Cambridge Dancers' Club

    Vice President (Events)

    -

    Responsibilities for this role include organization of inter-collegiate competitions and triannual balls, liaising between the Executive Treasurer and venues over requirements for Temporary Event Notices, and organization of licenses to sell excisable alcohol. In the absence of a president between April 2012 and June 2012 I was also responsible for the organization of committee, and executive meetings. I was responsible for minuting committee meetings between April 2012 and June 2012. Excerpt…

    Responsibilities for this role include organization of inter-collegiate competitions and triannual balls, liaising between the Executive Treasurer and venues over requirements for Temporary Event Notices, and organization of licenses to sell excisable alcohol. In the absence of a president between April 2012 and June 2012 I was also responsible for the organization of committee, and executive meetings. I was responsible for minuting committee meetings between April 2012 and June 2012. Excerpt from the President's Report, published in the minutes of the AGM 2013: "Our termly balls have continued successfully, and I would like to extend my heartfelt thanks to our VP(Events) for running the one section of the club that has operated without any presidential assistance this year, and for providing an excellent selection of cakes at the spring ball."

  • Physics Undergraduate Consultancy Service (PUCS)

    Member

    -

    PUCS was a series of informal, weekly tutorials given by third and fourth year undergraduates for the benefit of the first and second year students. As a member of this organization, I participated in both one-to-one mentoring, and working through widely misunderstood concepts with larger groups.

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