Research Interests

My main research interest is the electronic structure of transition metal clusters and coordination compounds. Specifically, I am interested into gaining insight into how manipulation of the atomic environment affects the electronic structure at the transition metal site. The controlled manipulation is achieved in clusters by varying the number of atoms and by doping or alloying of the clusters. To probe the electronic structure of cluster or molecular ions, I apply x-ray absorption spectroscopy and x-ray induced photodissociation in combination with mass spectrometry. Additionally, information on the spin and orbital magnetic moments of the ions is obtainable by exploting the x-ray magnetic circular dichroism effect.

I am also involved in the development of methods for extending the application range of x-ray spectroscopy techniques into the gas-phase. These include new methods for the preparation of molecular and atomic ions or new ion yield selective detection schemes.

A complete list of my publications as pdf can be downloaded below:

Publications

Recent publications

2019


Walter, M.; Vogel, M.; Zamudio-Bayer, V.; Lindblad, R.; Reichenbach, T.; Hirsch, K.; Langenberg, A.; Rittmann, J.; Kulesza, A.; Mitric, R.; Moseler, M.; Möller, T.; Issendorff, B. von; Lau, J.T.: Experimental and theoretical 2p core-level spectra of size-selected gas-phase aluminum and silicon cluster cations: chemical shifts, geometric structure, and coordination-dependent screening. Physical Chemistry Chemical Physics 21 (2019), p. 6651-6661

2018


Bari, S.; Egorov, D.; Jansen, T.; Boll, R.; Hoekstra, R.; Techert, S.; Zamudio-Bayer, V.; Bülow, C.; Lindblad, R.; Leistner, G.; Lawicki, A.; Hirsch, K.; Miedema, P.; von Issendorff, B.; Lau, J.T.; Schlathölter, T.: Soft X-ray Spectroscopy as a Probe for Gas-Phase Protein Structure: Electron Impact Ionization from Within. Chemistry - A European Journal 24 (2018), p. 7631-7636


Egorov, D.; Bari, S.; Boll, R.; Dörner, S.; Deinert, S.; Techert, S.; Hoekstra, R.; Zamudio-Bayer, V.; Lindblad, R.; Bülow, C.; Timm, M.; von Issendorff, B.; Lau, J.T.; Schlathölter, T.: Near-Edge Soft X-ray Absorption Mass Spectrometry of Protonated Melittin. Journal of The American Society for Mass Spectrometry 29 (2018), p. 2138–2151


Meier, S.C.; Holz, A.; Kulenkampff, J.; Schmidt, A.; Kratzert, D.; Himmel, D.; Schmitz, D.; Scheidt, E.; Scherer, W.; Bülow, C.; Timm, M.; Lindblad, R.; Akin, S.; Zamudio-Bayer, V.; von Issendorff, B.; Duncan, M.; Lau, J.T.; Krossing, I.: Access to the Bis-benzene Cobalt(I) Sandwich Cation and its Derivatives: Synthons for a "Naked" Cobalt(I) Source? Angewandte Chemie - International Edition 57 (2018), p. 9310-9314


Zamudio-Bayer, V.; Hirsch, K.; Langenberg, A.; Lawicki, A.; Terasaki, A.; von Issendorff, B.; Lau, T.: Large orbital magnetic moments of small, free cobalt cluster ions Co+n with n ≤ 9. Journal of Physics / Condensed Matter 30 (2018), p. 464002/1-10

2016


Akin, S.T.; Zamudio-Bayer, V.; Duanmu, K.; Leistner, G.; Hirsch, K.; Bülow, C.; Lawicki, A.; Terasaki, A.; von Issendorff, B.; Truhlar, D.G.; Lau, J.T.; Duncan, M.A.: Size-Dependent Ligand Quenching of Ferromagnetism in Co3(benzene)n+ Clusters Studied with X-ray Magnetic Circular Dichroism Spectroscopy. Journal of Physical Chemistry Letters 7 (2016), p. 4568-4575


Zamudio-Bayer, V.; Lindblad, R.; Bülow, C.; Leistner, G.; Terasaki, A.; von Issendorff, B.; Lau, J. T.: Electronic ground state of Ni2+. The Journal of Chemical Physics 145 (2016), p. 194392/1-7

2015


Hirsch, K.; Zamudio-Bayer, V.; Langenberg, A.; Niemeyer, M.; Langbehn, B.; Möller, T.; Terasaki, A.; von Issendorff, B.; Lau, J. T.: Magnetic Moments of Chromium-Doped Gold Clusters: The Anderson Impurity Model in Finite Systems. Physical Review Letters 114 (2015), p. 087202/1-6


Hirsch, K.; Zamudio-Bayer, V.; Langenberg, A.; Vogel, M.; Rittmann, J.; Forin, S.; Möller, T.; von Issendorff, B.; Lau, J.T.: Impurity Electron Localization in Early-Transition-Metal-Doped Gold Clusters. The Journal of Physical Chemistry C 119 (2015), p. 11184-11192


Kasigkeit, C.; Hirsch, K.; Langenberg, A.; Möller, T.; Probst, J.; Rittmann, J.; Vogel, M.; Wittich, J.; Zamudio-Bayer, V.; von Issendorff, B.; Lau, J.T.: Higher Ionization Energies from Sequential Vacuum Ultraviolet Multiphoton Ionization of Size-Selected Silicon Cluster Cations. The Journal of Physical Chemistry C 119 (2015), p. 11148-11152


Zamudio-Bayer, V.; Hirsch, K.; Langenberg, A.; Kossick, M.; Ławicki, A.; Terasaki, A.; v. Issendorff, B.; Lau, J.T.: Direct observation of high-spin states in manganese dimer and trimer cations by x-ray magnetic circular dichroism spectroscopy in an ion trap. The Journal of Chemical Physics 142 (2015), p. 234301/1-6


Zamudio-Bayer, V.; Hirsch, K.; Langenberg, A.; Lawicki, A.; Terasaki, A.; von Issendorff, B.; Lau, J.T.: Electronic ground states of Fe2+ and Co2+ as determined by x-ray absorption and x-ray magnetic circular dichroism spectroscopy. The Journal of Chemical Physics 143 (2015), p. 244318/1-6


Zamudio-Bayer, V.; Hirsch, K.; Langenberg, A.; Niemeyer, M.; Vogel, M.; Lawicki, A.; Terasaki, A.; Lau, J.T.; Von Issendorff, B.: Maximum Spin Polarization in Chromium Dimer Cations as Demonstrated by X-ray Magnetic Circular Dichroism Spectroscopy. Angewandte Chemie - International Edition 54 (2015), p. 4498-4501

2014


Langenberg, A.; Hirsch, K.; Lawicki, A.; Zamudio-Bayer, V.; Niemeyer, M.; Chmiela, P.; Langbehn, B.; Terasaki, A.; von Issendorff, B.; Lau, J.T.: Spin and orbital magnetic moments of size-selected iron, cobalt, and nickel clusters. Physical Review B 90 (2014), p. 184420/1-14

2013


Zamudio-Bayer, V.; Leppert, L.; Hirsch, K.; Langenberg, A.; Rittmann, J.; Kossick, M.; Vogel, M.; Richter, R.; Terasaki, A.; Möller, T.; Issendorff, B. v.; Kümmel, S.; Lau, J.T.: Coordination-driven magnetic-to-nonmagnetic transition in manganese-doped silicon clusters. Physical Review B 88 (2013), p. 115425/1-6

2012


Hirsch, K.; Zamudio-Bayer, V.; Rittmann, J.; Langenberg, A.; Vogel, M.; Möller, T.; v. Issendorff, B.; Lau, J.T.: Initial- and final-state effects on screening and branching ratio in 2p x-ray absorption of size-selected free 3d transition metal clusters. Physical Review B 86 (2012), p. 165402/1-11


Niemeyer, M.; Hirsch, K.; Zamudio-Bayer, V.; Langenberg, A.; Vogel, M.; Kossick, M.; Ebrecht, C.; Egashira, K.; Terasaki, A.; Möller, T.; von Issendorff, B.; Lau, J.T.: Spin Coupling and Orbital Angular Momentum Quenching in Free Iron Clusters. Physical Review Letters 108 (2012), p. 057201/1-5


Vogel, M.; Kasigkeit, C.; Hirsch, K.; Langenberg, A.; Rittmann, J.; Zamudio-Bayer, V.; Kulesza, A.; Mitric, R.; Möller, T.; v. Issendorff, B.; Lau, J.T.: 2p core-level binding energies of size-selected free silicon clusters: Chemical shifts and cluster structure. Physical Review B 85 (2012), p. 195454/1-5


Zamudio-Bayer, V.; Ameseder, F.; Langenberg, A.; Rittmann, J.; Vogel, M.; Möller, T.; v. Issendorff, B.; Lau, J.T.: 2p x-ray absorption of free transition-metal cations across the 3d transition elements: Calcium through copper. Physical Review A 85 (2012), p. 062501/1-9

2011


Lau, J.T.; Vogel, M.; Langenberg, A.; Hirsch, K.; Rittmann, J.; Zamudio-Bayer, V.; Möller, T.; von Issendorff, B.: Communication: Highest occupied molecular orbital-lowest unoccupied molecular orbital gaps of doped silicon clusters from core level spectroscopy. The Journal of Chemical Physics 134 (2011), p. 041102/1-3