Publications

@article{doi:10.1021/acs.jpclett.4c00768,

title = {Preparation of Tautomer-Pure Molecular Beams by Electrostatic Deflection},

author = {Grite L. Abma and Michael A. Parkes and Daniel A. Horke},

doi = {10.1021/acs.jpclett.4c00768},

year  = {2024},

date = {2024-04-24},

urldate = {2024-04-24},

journal = {J. Phys. Chem. Lett.},

volume = {15},

number = {17},

pages = {4587-4592},

keywords = {Control, electrostatic deflector, experimental design, Isomer-effects, photoelectron imaging, Photoelectron spectroscopy},

pubstate = {published},

tppubtype = {article}

}

@article{abmaSinglecolorIsomerresolvedSpectroscopy2022,

title = {Single-Color Isomer-Resolved Spectroscopy},

author = {Grite L. Abma and Dries Kleuskens and Siwen Wang and Michiel Balster and Andre Roij and Niek Janssen and Daniel A. Horke},

url = {https://doi.org/10.1021/acs.jpca.2c02277},

doi = {10.1021/acs.jpca.2c02277},

year  = {2022},

date = {2022-06-01},

urldate = {2022-06-01},

journal = {The Journal of Physical Chemistry A},

volume = {126},

pages = {3811\textendash3815},

abstract = {Structural isomers, such as conformers or tautomers, are

of significant importance across chemistry and biology, as they can have

different functionalities. In gas-phase experiments using molecular

beams, formation of many different isomers cannot be prevented, and

their presence significantly complicates the assignment of spectral lines.

Current isomer-resolved spectroscopic techniques heavily rely on

theoretical calculations or make use of elaborate double-resonance

schemes. We show here that isomer-resolved spectroscopy can also be

performed using a single tunable laser. In particular, we demonstrate

single-color isomer-resolved spectroscopy by utilizing electrostatic

deflection to spatially separate the isomers. We show that for 3-

aminophenol we can spatially separate the syn and anti conformers and

use these pure samples to perform high-resolution REMPI spectroscopy, making the assignment of transitions to a particular isomer trivial, without any additional a priori information. This approach allows one to add isomer specificity to any molecular-beam-based experiment.},

keywords = {Control, electrostatic deflector, experimental design, Isomer-effects},

pubstate = {published},

tppubtype = {article}

}

@article{Teschmit:Angew.Chem.Int.Ed.57:13775,

title = {Spatially Separating the Conformers of a Dipeptide},

author = {Nicole Teschmit and Daniel A. Horke and Jochen K\"{u}pper},

url = {https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201807646},

doi = {10.1002/anie.201807646},

year  = {2018},

date = {2018-08-01},

journal = {Angew. Chem. Int. Ed.},

volume = {57},

pages = {13775--13779},

keywords = {Control, electrostatic deflector, Isomer-effects, Simulation},

pubstate = {published},

tppubtype = {article}

}

@article{Horke:Phys.Rev.Lett.117:163002,

title = {Hydrogen Bonds in Excited State Proton Transfer},

author = {D A Horke and H M Watts and A D Smith and E Jager and E Springate and O Alexander and C Cacho and R T Chapman and R S Minns},

url = {http://link.aps.org/doi/10.1103/PhysRevLett.117.163002},

doi = {10.1103/PhysRevLett.117.163002},

year  = {2016},

date = {2016-10-01},

journal = {Phys. Rev. Lett.},

volume = {117},

number = {16},

pages = {163002},

abstract = {Hydrogen bonding may safeguard biomolecules against the damaging effects of UV light.},

keywords = {Coincidence Imaging, intramolecular interactions, Isomer-effects, Non-adiabatic dynamics, photoelectron imaging, Photoelectron spectroscopy, velocity-map imaging},

pubstate = {published},

tppubtype = {article}

}

@article{Chang:Int.Rev.Phys.Chem.34:557,

title = {Spatially-Controlled Complex Molecules and Their Applications},

author = {Yuan-Pin Chang and Daniel A Horke and Sebastian Trippel and Jochen K\"{u}pper},

url = {http://www.tandfonline.com/doi/full/10.1080/0144235X.2015.1077838},

doi = {10.1080/0144235X.2015.1077838},

year  = {2015},

date = {2015-10-01},

journal = {Int. Rev. Phys. Chem.},

volume = {34},

number = {4},

pages = {557--590},

keywords = {clusters, electrostatic deflector, Isomer-effects, review},

pubstate = {published},

tppubtype = {article}

}

@article{Horke:JoVE:e51137,

title = {Spatial Separation of Molecular Conformers and Clusters},

author = {Daniel Horke and Sebastian Trippel and Yuan-Pin Chang and Stephan Stern and Terry Mullins and Thomas Kierspel and Jochen K 252 pper},

url = {http://www.jove.com/video/51137},

issn = {1940-087X},

year  = {2014},

date = {2014-01-01},

journal = {JoVE},

number = {83},

pages = {e51137},

abstract = {Gas-phase molecular physics and physical chemistry experiments commonly use supersonic expansions through pulsed valves for the production of cold molecular beams. However, these beams often contain multiple conformers and clusters, even at low rotational temperatures. We present an experimental methodology that allows the spatial separation of these constituent parts of a molecular beam expansion. Using an electric deflector the beam is separated by its mass-to-dipole moment ratio, analogous to a bender or an electric sector mass spectrometer spatially dispersing charged molecules on the basis of their mass-to-charge ratio. This deflector exploits the Stark effect in an inhomogeneous electric field and allows the separation of individual species of polar neutral molecules and clusters. It furthermore allows the selection of the coldest part of a molecular beam, as low-energy rotational quantum states generally experience the largest deflection. Different structural isomers (conformers) of a species can be separated due to the different arrangement of functional groups, which leads to distinct dipole moments. These are exploited by the electrostatic deflector for the production of a conformationally pure sample from a molecular beam. Similarly, specific cluster stoichiometries can be selected, as the mass and dipole moment of a given cluster depends on the degree of solvation around the parent molecule. This allows experiments on specific cluster sizes and structures, enabling the systematic study of solvation of neutral molecules.},

keywords = {clusters, Control, electrostatic deflector, Isomer-effects},

pubstate = {published},

tppubtype = {article}

}

@article{Kierspel:Chem.Phys.Lett.591:130,

title = {Spatially Separated Polar Samples of the Cis and Trans Conformers of 3-Fluorophenol},

author = {Thomas Kierspel and Daniel A Horke and Yuan-Pin Chang and Jochen K\"{u}pper},

url = {http://www.sciencedirect.com/science/article/pii/S0009261413014000},

doi = {10.1016/j.cplett.2013.11.010},

year  = {2014},

date = {2014-01-01},

journal = {Chem. Phys. Lett.},

volume = {591},

number = {0},

pages = {130--132},

keywords = {Control, electrostatic deflector, Isomer-effects, Simulation},

pubstate = {published},

tppubtype = {article}

}