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Chemistry: Laser Spectroscopy and Dynamics

Publications


2013

A. S. Chatterley, A. S. Johns, V. G. Stavros and Jan R. R. Verlet

Base-specific ionization of deprotonated nucleotides by resonance-enhanced two-photon detachment

Journal of Physical Chemistry A in press

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The adiabatic ionisation energies for the four DNA bases in a nucleotide have been measured using a two-photon scheme: the first photon is resonant with the ππ* states and the second ionises these. Because the sugar and phosphate do not have π-orbitals, these do not contribute to the ionisation spectrum.

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C. R. S. Mooney, D. A. Horke, A. S. Chatterley, A. Simperler, H. H. Fielding and Jan R. R. Verlet

Taking the green fluorescence out of the protein: dynamics of the isolated GFP chromophore anion

Chemical Science 4, 921 (2013) Cover

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Time-resolved photoelectron spectra of GFP chromophore anion reveal that excited state decays by internal converion from the S1 state enable by rotation about the bridging allyl unit.

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2012

A. S. Chatterley, D. A. Horke and J. R. R. Verlet

On the intrinsic photophysics of indigo: a time-resolved photoelectron spectroscopy study of the indigo carmine dianion

Physical Chemistry Chemical Physics 14, 16155 (2012)

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We show that the intrinsic photostability of indigo arises from a fast excited state intramolecular proton transfer.

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D. A. Horke, G. M. Roberts, J. Lecointre and J. R. R. Verlet

Velocity-map imaging at low extraction fields

Review of Scientific Instruments 83, 063101 (2012)

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A new VMI spectrometer is built using a resisitive glass tube and allows for low (a few V cm–1) extraction fields and the capture of a photoelectron image with a 9 V battery to drive the electodes!

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D. A. Horke and J. R. R. Verlet

Photoelectron spectroscopy of the model GFP chromophore anion

Physical Chemistry Chemical Physics 14, 8511 (2012)

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The first photoelectron spectrum of the GFP chromophore anion at seeveral photon energies shows that the S1 state is bound relative to the neutral (but only just).

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D. A. Horke, Adam S. Chatterley and J. R. R. Verlet

Femtosecond Photoelectron Imaging of Aligned Polyanions: Probing Molecular Dynamics through the Electron–Anion Coulomb Repulsion

Journal of Physical Chemistry Letters 3, 834 (2012)

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The effect of the Coulomb repulsion in the photoelectron spectroscopy of an anion is measured through photoelectron imaging of an aligned dianion. Time-resovled photoelectron angular distributions show that the rotational dynamics can be tracked through this repulsion in real-time.

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D. A. Horke, Adam S. Chatterley and J. R. R. Verlet

Effect of internal energy on the repulsive Coulomb barrier of polyanions

Physical Review Letters 108, 083003 (2012)

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Electron tunnelling through the repulsive Coulomb barrier of a dianion conserves internal energy resulting in photoelectron spectra that do not adhere to the usual rules of photoelectron spectroscopy!

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2011

D. A. Horke and J. R. R. Verlet

Time-resolved photoelectron imaging of the chloranil radical anion: Ultrafast relaxation of electronically excited electron acceptor states

Physical Chemistry Chemical Physics 13, 19546 (2011)

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The dynamics of near-threshold excited states of the chloranil radical anion are shown to decay on a sub-100 fs timscale.

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D. A. Horke , G. M. Roberts and J. R. R. Verlet

Excited States in Electron-Transfer Reaction Products: Ultrafast Relaxation Dynamics of an Isolated Acceptor Radical Anion

Journal of Physical Chemistry A, 115, 8369 (2011)

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The excited states near the detachment threshold of TCNQ-F4 are shown to decay on an ultrafast timescale.

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2010

J. Lecointre, G. M. Roberts, D. A. Horke and J. R. R. Verlet

Ultrafast Relaxation Dynamics Observed Through Time-resolved Photoelectron Angular Distributions

Journal of Physical Chemistry A, 114, 11216 (2010)

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Ultrafast dynamics are observed through time-resovled photoelectron spectorscopy and through time-resolved photoelectron angular distributions. In certain cases, the latter can provide insight that cannot be obtained by the former. This paper also describes our experiment in detail.

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D. M. Sagar, C. D. Bain and J. R. R. Verlet

Hydrated Electrons at the Water/Air Interface

Journal of American Chemical Society 132, 6917 (2010)

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Time-resolved second harmonic generation spectroscopy performed in our lab shows that electron can reside at the water/air interface, but remain below the dividing surface.

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G. M. Roberts, J. Lecointre, D. A. Horke and J. R. R. Verlet

Spectroscopy and Dynamics of the 7,7,8,8-Tetracyanoquinodimethane Radical Anion

Physical Chemistry Chemical Physics 12, 6226 (2010)

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The first time-resovled photoelectron imaging experiment using ESI as an ion source! The dynamics of TCNQ show fast internal conversion as well as excited state wavepacket motion.

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2009

• R. M. Young, G. B. Griffin, O. T. Ehrler, A. Kammrath, A. E. Bragg, J. R. R. Verlet, O. Cheshnovsky, and D. M. Neumark

Charge carrier dynamics in semiconducting mercury cluster anions

Physica Scripta 80, 048102 (2009)

• G. M. Roberts, J. L. Nixon, J. Lecointre, E. Wrede and J. R. R. Verlet

Toward real-time charged-particle image reconstruction using polar onion peeling

Review of Scientific Instruments 80, 053104 (2009)

2008

• J. R. R. Verlet

Femtosecond spectroscopy of cluster anions: insights into condensed-phase phenomena from the gas-phase

Chemical Society Reviews 37, 505 (2008)

Pre-2007

2007

• A. Kammrath, G. B. Griffin, J. R. R. Verlet, R. M. Young, and D. M. Neumark

Time-resolved photoelectron imaging of large anionic methanol clusters: (Methanol)n−(n~145–535)

Journal of Chemical Physics 126, 244306 (2007)

2006

• A. Kammrath, J. R. R. Verlet, G. B. Griffin, and D. M. Neumark

Photoelectron imaging of large anionic methanol clusters: (MeOH)n−(n~70–460)

Journal of Chemical Physics 125, 171102 (2006)

• A. Kammrath, J. R. R. Verlet, G. B. Griffin, and D. M. Neumark

Photoelectron spectroscopy of large (H2O)n− (n=50–200) clusters at 4.7 eV

Journal of Chemical Physics 125, 076101 (2006)

2005

• J. R. R. Verlet, A. E. Bragg, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Comment on ‘‘Characterization of Excess Electrons in Water-Cluster Anions by Quantum Simulations’’

Science 310, 1769b (2005)

• J. R. R. Verlet, A. E. Bragg, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Observation of Large Water-Cluster Anions with Surface-Bound Excess Electrons

Science 307, 93 (2005)

• A. Kammrath, J. R. R. Verlet, A. E. Bragg, G. B. Griffin, and D. M. Neumark

Dynamics of Charge-Transfer-to-Solvent Precursor States in I-(water)n (n = 3-10) Clusters Studied with Photoelectron Imaging

Journal of Physical Chemistry A 109, 11475 (2005)

• J. R. R. Verlet, A. Kammrath, G. B. Griffin, and D. M. Neumark

Electron solvation in water clusters following charge transfer from iodide

Journal of Chemical Physics 123, 231102 (2005)

• A. E. Bragg, J. R. R. Verlet, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Time-resolved intraband electronic relaxation dynamics of Hgn- clusters (n=7–13,15,18…) excited at 1.0eV

Journal of Chemical Physics 122, 054314 (2005)

• A. E. Bragg, J. R. R. Verlet, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Electronic Relaxation Dynamics of Water Cluster Anions

Journal of the American Chemical Society 127, 15283 (2005)

2004

• A. E. Bragg, J. R. R. Verlet, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Hydrated Electron Dynamics: From Clusters to Bulk

Science 306, 669 (2004)

• J. R. R. Verlet, A. E. Bragg, A. Kammrath, O. Cheshnovsky, and D. M. Neumark

Time-resolved relaxation dynamics of Hgn- (11<n<16, n=18…) clusters following intraband excitation at 1.5 eV

Journal of Chemical Physics 121, 10015 (2005)

• A. E. Bragg, J. R. R. Verlet, A. Kammrath, and D. M. Neumark

C6- electronic relaxation dynamics probed via time-resolved photoelectron imaging

Journal of Chemical Physics 121, 3515 (2005)

2003

• R. A. L. Smith, J. R. R. Verlet and H. H. Fielding

Rydberg wave packets in molecules

Physical Chemistry Chemical Physics 5, 3567 (2003)

• J. R. R. Verlet, V. G. Stavros, R. S. Minns and H. H. Fielding

Controlling the radial dynamics of Rydberg wavepackets in Xe using phase-locked optical pulse sequences

Journal of Physics B: Atomic, Molecular and Optical Physics 36, 3683 (2003)

• R. S. Minns, J. R. R. Verlet, L. J. Watkins, and H. H. Fielding

Observation and control of dissociating and autoionizing Rydberg electron wave packets in NO

Journal of Chemical Physics 119, 5842 (2003)

• R. A. L. Smith, V. G. Stavros, J. R. R. Verlet, and H. H. Fielding

D. Townsend and T. P. Softley

The role of phase in molecular Rydberg wave packet dynamics

Journal of Chemical Physics 119, 3085 (2003)

2002

• J. R. R. Verlet, V. G. Stavros, and H. H. Fielding

Wave-packet isotope separation using phase-locked pulses

Physical Review A 65, 032504 (2002)

2001

• J. R. R. Verlet and H. H. Fielding

International Reviews in Physical Chemistry 20, 283 (2001)

2000

• R. A. L. Smith, J. R. R. Verlet, E. D. Boleat, V. G. Stavros and H. H. Fielding

The dynamics of Rydberg electron wavepackets in NO

Faraday Discussions 115, 63 (2000)

1999

• V. G. Stavros, J. A. Ramswell, R. A. L. Smith, J. R. R. Verlet, J. Lei, and H. H. Fielding

Vibrationally Autoionizing Rydberg Wave Packets in NO

Physical Review Letters 83, 2552 (1999); 84, 1847 (2000)