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Personal profile

Research interests

Dave’s current research interests span the interface between physics and chemistry, employing “ultrafast” femtosecond laser techniques to investigate the quantum control of fundamental molecular processes and electronic relaxation dynamics in molecules of biophysical interest. Understanding energy redistribution in biological molecules is clearly important if one is to move from studying simple structure-function relationships in these types of systems to a more complete structure-dynamics-function picture that provides a greater fundamental mechanistic understanding. Quantum control methodologies are of great interest since they represent the beginning of a shift from a regime where molecular dynamics are simply observed towards one where they are actively controlled and this is clearly of profound importance for many areas of physics, chemistry and biology. Dave also has a current collaboration with Prof. Ken McKendrick and Dr Matt Costen within the Chemistry Department at Heriot-Watt. This work focuses on using nanosecond lasers in conjunction with ion-imaging methods to study the dynamics of small molecule photodissociation.

Biography

Dave began his research career at the University of Nottingham, obtaining a PhD for investigations into the dynamics of molecular photoionization under the supervision of Katharine Reid. Following on from this he spent time as a postdoctoral researcher in the groups of Tim Softley at the University of Oxford, investigating the spatial manipulation of Stark shifted atomic Rydberg states, and Arthur Suits at the State University of New York (SUNY), using ion imaging methods for the study of molecular photodissociation.  Prior to his current appointment, Dave was a Visiting Research Fellow at the National Research Council of Canada in Ottawa, working with Albert Stolow. During this time he developed parallel research interests in the use of time-resolved photoelectron spectroscopy as a probe of excited state dynamics in molecules of biological interest and in quantum control methodologies exploiting the non-resonant dynamic Stark effect through the use of intense ultrafast laser pulses. Dave joined Heriot-Watt University as a lecturer in 2007.

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  • 7 Similar Profiles
photoelectrons Physics & Astronomy
excitation Physics & Astronomy
Gases Chemical Compounds
Excited states Chemical Compounds
internal conversion Physics & Astronomy
Spectroscopy Chemical Compounds
vapor phases Physics & Astronomy
Photoionization Chemical Compounds

Co Author Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 2000 2019

  • 43 Article
  • 1 Conference contribution
  • 1 Book/Film/Article review
  • 1 Literature review

Dynamics of electronically excited states in the eumelanin building block 5,6-dihydroxyindole

Crane, S. W., Ghafur, O., Cowie, T. Y., Lindsay, A. G., Thompson, J. O. F., Greenwood, J. B., Bebbington, M. W. P. & Townsend, D., 21 Apr 2019, In : Physical Chemistry Chemical Physics. 21, 15, p. 8152-8160 9 p.

Research output: Contribution to journalArticle

Excited states
vapor phases
internal conversion
pigments
Gases

Dynamics of Pyrroles Excited to the 3s/πσ* State

Lamas, I., Longarte, A., Peralta Conde, A., Muga, G., Townsend, D. & Montero, R., 24 Oct 2019, In : Journal of Physical Chemistry A. 123, 42, p. 8982-8993 12 p.

Research output: Contribution to journalArticle

Pyrroles
Lasers
Theoretical Models

The influence of substituent position on the excited state dynamics operating in 4-, 5- and 6-hydroxyindole

Crane, S. W., Ghafur, O., Saalbach, L., Paterson, M. J. & Townsend, D., 19 Oct 2019, In : Chemical Physics Letters. 136870.

Research output: Contribution to journalArticle

Quantum chemistry
Molecular beams
Vapor pressure
Excited states
Desorption

Ultrafast deep and vacuum ultraviolet gas-filled hollow-core fibre sources for time-resolved photoelectron spectroscopy

Belli, F., Kotsina, N., Gao, S-F., Wang, Y-Y., Wang, P., Travers, J. C. & Townsend, D., 17 Oct 2019, 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 8872255

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Photoelectron spectroscopy
hollow
Gases
photoelectron spectroscopy
Pumps

Ultrafast Molecular Spectroscopy Using a Hollow-Core Photonic Crystal Fiber Light Source

Kotsina, N., Belli, F., Gao, S-F., Wang, Y-Y., Wang, P., Travers, J. C. & Townsend, D., 21 Feb 2019, In : Journal of Physical Chemistry Letters. 10, 4, p. 715-720 6 p.

Research output: Contribution to journalArticle

Molecular spectroscopy
molecular spectroscopy
Photonic crystal fibers
Light sources
hollow