C. Sparling, D. Rajak, V. Blanchet, Y. Mairesse & D. Townsend, Fourier-Hankel-Abel Nyquist-limited Tomography: A spherical harmonic basis function approach to tomographic velocity-map image reconstruction, Rev. Sci. Instrum., 95, 053301, (2024).

W. O. Razmus, F. Allum, J. Harries, Y. Kumagai, K. Nagaya, S. Bhattacharyya, M. Britton, M. Brouard, P. H. Bucksbaum, K. Cheung, S. W. Crane, M. Fushitani, I. Gabalski, T. Gejo, A. Ghrist, D. Heathcote, Y. Hikosaka, A. Hishikawa, P. Hockett, E. Jones, E. Kukk, H. Iwayama, H. V. S. Lam, J. W. McManus, D. Milesevic, J. Mikosch, S. Minemoto, A. Niozu, A. J. Orr-Ewing, S. Owada, D. Rolles, A. Rudenko, D. Townsend, K. Ueda, J. Unwin, C. Vallance, A. Venkatachalam, S. Wada, T. Walmsley, E. M. Warne, J. L. Woodhouse, M. Burt, M. N. R. Ashfold, R. S. Minns & R. Forbes, Exploring the ultrafast and isomer-dependent photodissociation of iodothiophenes via site-selective ionization, Phys. Chem. Chem. Phys., 26, 12725, (2024).


C. Sparling, A. Ruget, L. Ireland, N. Kotsina, O. Ghafur, J. Leach & D. Townsend, The importance of molecular axis alignment and symmetry-breaking in photoelectron elliptical dichroism, J. Chem. Phys., 159, 214301, (2023).

S. W. Crane, M. Garrow, P. D. Lane, K. Robertson, A. Waugh, J. M. Woolley, V. G. Stavros, M. J. Paterson, S. J. Greaves & D. Townsend, The value of different experimental observables: A transient absorption study of the ultraviolet excitation dynamics operating in nitrobenzene, J. Phys. Chem. A., 127, 6425, (2023).

D. Townsend, Mapping extended reaction coordinates in photochemical dynamics, J. Mol. Spec., 395, 111807, (2023).

D. M. P. Holland, D. A. Shaw, D. Townsend & I. Powis, Valence shell electronically excited states of imidazole and 1-methylimidazole, Mol. Phys., 121, e2122614, (2023).

C. Sparling, S. W. Crane, L. Ireland, R. Anderson, O. Ghafur, J. B. Greenwood & D. Townsend, Velocity-map imaging of photoelectron circular dichroism in non-volatile molecules using a laser-based desorption sourcePhys. Chem. Chem. Phys., 25, 6009, (2023).


N. Kotsina, S. L. Jackson, T. Malcomson, M. J. Paterson & D. Townsend, Photochemical carbon–sulfur bond cleavage in thioethers mediated via excited state Rydberg-to-valence evolutionPhys. Chem. Chem. Phys., 24, 29423, (2022).

C. Sparling & D. Townsend, Tomographic reconstruction techniques optimized for velocity-map imaging applicationsJ. Chem. Phys., 157, 114201, (2022).

N. Kotsina, C. Brahms, S. L. Jackson, J. C. Travers & D. Townsend, Spectroscopic application of few-femtosecond deep-ultraviolet laser pulses from resonant dispersive wave emission in a hollow core capillaryChem. Sci., 13, 9585, (2022).

C. Sparling, A. Ruget, J. Leach & D. Townsend, Arbitrary Image Reinflation: A deep learning technique for recovering 3D photoproduct distributions from a single 2D projectionRev. Sci. Instrum., 93, 023303, (2022).


L. Saalbach, N. Kotsina, S. W. Crane, M. J. Paterson & D. Townsend, Ultraviolet excitation dynamics of nitrobenzenesJ. Phys. Chem. A, 125, 7174, (2021).

J. Bocková, A. Rebelo, M. Ryszka, R. Pandey, D. Mészáros, P. Limão-Vieira, P. Papp, N. J. Mason, D. Townsend, K. L. Nixon, V. Vizcaino, J.-C. Poully & S. Eden, Thermal desorption effects on fragment ion production from multi-photon ionized uridine and selected analoguesRSC Adv., 11, 20612, (2021).

N. Kotsina & D. Townsend, Improved insights in time-resolved photoelectron imagingPhys. Chem. Chem. Phys., 23, 10736, (2021).

C. Sparling, A. Ruget, N. Kotsina, J. Leach & D. Townsend, Artificial neural networks for noise removal in data‐sparse charged particle imaging experimentsChemPhysChem, 22, 76, (2021).


M. J. Paterson & D. Townsend, Rydberg-to-valence evolution in excited state molecular dynamicsInt. Rev. Phys. Chem., 39, 517, (2020).

N. Kotsina, M. Candelaresi, L. Saalbach, M. M. Zawadzki, S. W. Crane, C. Sparling & D. Townsend, Short-wavelength probes in time-resolved photoelectron spectroscopy: An extended view of the excited state dynamics in acetylacetonePhys. Chem. Chem. Phys., 22, 4647, (2020).

S. W. Crane, O. Ghafur, L. Saalbach, M. J. Paterson & D. Townsend, The influence of substituent position on the excited state dynamics operating in 4-, 5- and 6-hydroxyindoleChem. Phys. Lett., 738, 136870, (2020).


I. Lamas, A. Longarte, A. Peralta Conde, G. Muga, D. Townsend & R. Montero, Dynamics of pyrroles excited to the 3s/πσ* stateJ. Phys. Chem. A, 123, 8980, (2019).

S. W. Crane, O. Ghafur, T. Y. Cowie, A. G. Lindsay, J. O. F. Thompson, J. B. Greenwood, M. W. P. Bebbington & D. Townsend, Dynamics of electronically excited states in the eumelanin building block 5,6-dihydroxyindolePhys. Chem. Chem. Phys., 21, 8152, (2019).

M. A. B. Larsen, T. I. Sølling, R. Forbes, A. E. Boguslavskiy, V. Makhija, K. Veyrinas, R. Lausten, A. Stolow, M. M. Zawadzki, L. Saalbach, N. Kotsina, M. J. Paterson & D. Townsend, Vacuum ultraviolet excited state dynamics of small amidesJ. Chem. Phys., 150, 054301, (2019).

N. Kotsina, F. Belli, S. -f. Gao, Y -y. Wang, P. Wang, J. C. Travers & D. Townsend, Ultrafast molecular spectroscopy using a hollow-core photonic crystal fiber light sourceJ. Phys. Chem. Lett., 10, 715, (2019).


O. Ghafur, S. W. Crane, M. Ryszka, J. Bockova, A. Rebelo, L. Saalbach, S. De Camillis, J. B. Greenwood, S. Eden & D. Townsend, Ultraviolet relaxation dynamics in uracil: Time-resolved photoion yield studies using a laser-based thermal desorption sourceJ. Chem. Phys., 149, 034301, (2018).

O. Schalk, D. Townsend, T. J. A. Wolf, D. M. P. Holland, A. E. Boguslavskiy, M. Szöri & A. Stolow, Time-resolved photoelectron spectroscopy of nitrobenzene and its aldehydesChem. Phys. Lett., 691, 379, (2018).


N. Kotsina & D. Townsend, Relative detection sensitivity in ultrafast spectroscopy: state lifetime and laser pulse duration effectsPhys. Chem. Chem. Phys., 19, 29409, (2017).

J. Miles, D. Fernandes, A. Young, C. M. M. Bond, S. W. Crane, O. Ghafur, D. Townsend, J. Sá & J. B. Greenwood, A new technique for probing chirality via photoelectron circular dichroismAnal. Chim. Acta, 984, 134, (2017).


S. W. Crane, M. M. Zawadzki, J. O. F. Thompson, N. Kotsina, O. Ghafur & D. Townsend, Caveats in the interpretation of time-resolved photoionization measurements: A photoelectron imaging study of pyrroleJ. Chem. Phys., 145, 234304, (2016).

M. M. Zawadzki, M. Candelaresi, L. Saalbach, S. W. Crane, M. J. Paterson & D. Townsend, Observation of multi-channel non-adiabatic dynamics in aniline derivatives using time-resolved photoelectron imagingFaraday Discuss., 194, 185, (2016).

T. F. M. Luxford, T. R. Sharples, D. Townsend, K. G. McKendrick & M. L. Costen, Comparative stereodynamics in molecule-atom and molecule-molecule rotational energy transfer: NO(A2Σ+) + He and D2J. Chem. Phys., 145, 084312, (2016).

L. B. Klein, J. O. F. Thompson, S. W. Crane, L. Saalbach, T. I. Sølling, M. J. Paterson & D. Townsend, Ultrafast relaxation dynamics of electronically excited piperidine: ionization signatures of Rydberg/valence evolutionPhys. Chem. Chem. Phys., 18, 25070, (2016).

L. B. Klein, T. J. Morsing, R. A. Livingstone, D. Townsend & T. I. Sølling, The effects of symmetry and rigidity on non-adiabatic dynamics in tertiary amines: a time-resolved photoelectron velocity-map imaging study of the cage-amine ABCOPhys. Chem. Chem. Phys., 18, 9715, (2016).

J. O. F. Thompson, L. B. Klein, T. I. Sølling, M. J. Paterson & D. Townsend, The role of novel Rydberg-valence behaviour in the non-adiabatic dynamics of tertiary aliphatic aminesChem. Sci., 7, 1826, (2016).


T. R. Sharples, T. F. M. Luxford, D. Townsend, K. G. McKendrick & M. L. Costen, Rotationally inelastic scattering of NO(A2Σ+) + Ar: Differential cross sections and rotational angular momentum polarizationJ. Chem. Phys., 143, 204301, (2015).

M. M. Zawadzki, J. O. F. Thompson, E. A. Burgess, M. J. Paterson & D. Townsend, Time-resolved photoionization spectroscopy of mixed Rydberg-valence states: indole case studyPhys. Chem. Chem. Phys., 17, 26659, (2015).

S. De Camillis, J. Miles, G. Alexander, O. Ghafur, I. D. Williams, D. Townsend & J. B. Greenwood, Ultrafast non-radiative decay of gas-phase nucleosidesPhys. Chem. Chem. Phys., 17, 23643, (2015).

J. O. F. Thompson, L. Saalbach, S. W. Crane, M. J. Paterson & D. Townsend, Ultraviolet relaxation dynamics of aniline, N,N-dimethylaniline and 3,5-dimethylaniline at 250 nmJ. Chem. Phys., 142, 114309, (2015).

Earlier Papers

S. E. Greenough, M. D. Horbury, J. O. F. Thompson, G. M. Roberts, T. N. V. Karsili, B. Marchetti, D. Townsend & V. G. Stavros, Solvent induced conformer specific photochemistry of guaiacolPhys. Chem. Chem. Phys., 16, 16187, (2014).

J. O. F. Thompson, R. A. Livingstone & D. Townsend, Following the relaxation dynamics of photoexcited aniline in the 273-266 nm region using time-resolved photoelectron imagingJ. Chem. Phys., 139, 034316, (2013).

A. S. Chatterley, J. D. Young, D. Townsend, J. M. Žurek, M. J. Paterson, G. M. Roberts & V. G. Stavros, Manipulating dynamics with chemical structure: probing vibrationally-enhanced tunnelling in photoexcited catecholPhys. Chem. Chem. Phys., 15, 6879, (2013).

R. A. Livingstone, J. O. F. Thompson, M. Iljina, R. J. Donaldson, B. J. Sussman, M. J. Paterson & D. Townsend, Time-resolved photoelectron imaging of excited state relaxation dynamics in phenol, catechol, resorcinol and hydroquinoneJ. Chem. Phys., 137, 184304, (2012).

E. Rubino, J. McLenaghan, S. C. Kehr, F. Belgiorno, D. Townsend, S. Rohr, C. E. Kuklewicz, U. Leonhardt, F. König & D. Faccio, Negative-frequency resonant radiationPhys. Rev. Lett., 108, 253901, (2012).

R. Livingstone, O. Schalk, A. E. Boguslavskiy, G. Wu, L. T. Bergendahl, A. Stolow, M. J. Paterson & D. Townsend, Following the relaxation dynamics of indole and 5-hydroxyindole using time-resolved photoelectron spectroscopyJ. Chem. Phys., 135, 194307, (2011).

P. J. Bustard, G. Wu, R. Lausten, D. Townsend, I. A. Walmsley, A. Stolow & B. J. Sussman, From molecular control to quantum technology with the dynamic Stark effect, Faraday Discuss., 153, 321, (2011).

A. E. Boguslavskiy, M. S. Schuurman, D. Townsend & A. Stolow, Non-Born-Oppenheimer wavepacket dynamics in polyatomic molecules: vibrations at conical intersections in DABCOFaraday Discuss., 150, 419, (2011).

D. Townsend, B. J. Sussman & A. Stolow, A Stark future for quantum controlJ. Phys. Chem. A115, 357, (2011).

P. Hockett, M. Staniforth, K. L. Reid, & D. Townsend, Rotationally resolved photoelectron angular distributions from a nonlinear polyatomic molecule,  Phys. Rev. Lett., 102, 253002, (2009).

H. R. Hudock, B. G. Levine, A. L. Thompson, H. Satzger, D. Townsend, N. Gador, S. Ullrich, A. Stolow & T. J. Martinez, Ab initio molecular dynamics and time resolved photoelectron spectroscopy of electronically excited uracil and thymineJ. Phys. Chem. A111, 8500, (2007).

D. Townsend, H. Satzger, T. Ejdrup, A. M. D. Lee, H. Staplefeldt & A. Stolow, 1B2 (1Σu+) excited state decay dynamics in CS2, J. Chem. Phys., 125, 234302, (2006). 

B. J. Sussman, D. Townsend, M. Yu. Ivanov & A. Stolow, Dynamic Stark control of photochemical processesScience314, 278, (2006).

H. Satzger, D. Townsend & A. StolowReassignment of the low-lying cationic states in gas-phase adenine and 9-methyl adenineChem. Phys. Lett.430, 144, (2006). 

S. A. Lahankar, S. D. Chambreau, D. Townsend, F. Suits, J. Farnum, X. Zhang, J. M. Bowman & A. G. Suits, The roaming atom pathway in formaldehyde decompositionJ. Chem. Phys.125, 044303, (2006). 

H. Satzger, D. Townsend, M. Z. Zigerski, S. Patchkovskii, S. Ullrich & A. Stolow, Primary processes underlying the photostability of isolated DNA bases: AdenineProc. Natl. Acad. Sci. USA103, 10196, (2006).

S. D. Chambreau, D. Townsend, S. A. Lahankar, S. K. Lee & A. G. Suits, Novel molecular elimination in formaldehyde photodissociation: The roaming H atom pathway, Phys. Scr.73, C89, (2006).

D. Townsend, W. Li, S. K. Lee, R. L. Gross & A. G. Suits, Universal and state resolved imaging of chemical dynamics, J. Phys. Chem. A, 109, 8661, (2005). 

S. K. Lee, D. Townsend, O. S. Vasyutinskii & A. G. Suits, O(1D2) orbital orientation in the ultraviolet photodissociation of ozonePhys. Chem. Chem. Phys., 7, 1650, (2005). 

D. Townsend, S. A. Lahankar, S. K. Lee, S. D. Chambreau, A. G. Suits, X. Zhang, J. Rheinecker, L. B. Harding & J. M. Bowman, The roaming atom: Straying from the reaction path in formaldehyde decomposition, Science, 306, 1158, (2004).

D. Townsend, S. K. Lee & A. G. Suits, DC slice imaging of CH3Cl photolysis at 193.3 nmJ. Phys. Chem. A108, 8106, (2004). 

D. Townsend, S. K. Lee & A. G. Suits, Orbital polarization from DC slice imaging: S(1D2) alignment in the photodissociation of ethylene sulfideChem. Phys.301, 197, (2004). 

D. Townsend, M. P. Minitti & A. G. Suits, Direct current slice imaging, Rev. Sci. Instrum.74, 2530, (2003). 

R. A. L. Smith, V. G. Stavros, J. R. R. Verlet, H. H. Fielding, D. Townsend & T. P. Softley, The role of phase in molecular Rydberg wavepacket dynamicsJ. Chem. Phys.119, 3085, (2003). 

D. Townsend, A. L. Goodgame, S. R. Procter, S. R. Mackenzie & T. P. Softley, Deflection of krypton Rydberg atoms in the field of an electric dipoleJ. Phys. B: At. Mol. Opt. Phys.34, 439, (2001). 

D. Townsend, & K. L. Reid, Photoionization dynamics probed by angle-resolved photoelectron spectroscopy of NH3 (B1E”)J. Chem. Phys.112, 9783, (2000).