Publications

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Djavani-Tabrizi, I., Lindkvist, T. T., Otzen, D. E. & Nielsen, S. B. (2026). When motion slows: intrinsic photophysics of thioflavin T and X cations at cryogenic temperatures. Physical Chemistry Chemical Physics, 28(18), 11181-11186. https://doi.org/10.1039/d6cp00731g

Boyé, S., Krogh, H., Nielsen, I. B., Nielsen, S. B., Pedersen, S. U., Pedersen, U. V. & Andersen, L. H. (2003). Vibrationally resolved photoabsorption spectroscopy of red fluorescent protein chromophore anions. Physical Review Letters, 90, 118103-1.

Holm, A., Nielsen, L. M., Hoffmann, S. V. & Nielsen, S. B. (2010). Vacuum-ultraviolet circular dichroism spectroscopy of DNA: a valuable tool to elucidate topology and electronic coupling in DNA. Physical Chemistry Chemical Physics, 12(33), 9581-9596. https://doi.org/10.1039/c003446k

Nielsen, L. M., Hoffmann, S. V. & Nielsen, S. B. (2012). Vacuum-ultraviolet circular dichroism reveals DNA duplex formation between short strands of adenine and thymine. Physical Chemistry Chemical Physics, 14(43), 15054-15059. https://doi.org/10.1039/c2cp42226c

Mathias Weber, J., Marcum, J. & Nielsen, S. B. (2013). UV Photophysics of DNA and RNA Nucleotides In Vacuo: Dissociation Channels, Time Scales, and Electronic Spectra. I S. B. Nielsen & J. A. Wyer (red.), Photophysics of Ionic Biochromophores (s. 181-207). Springer. https://doi.org/10.1007/978-3-642-40190-9_10

Ehlerding, A., Wyer, J., Zettergren, H., Kirketerp, M.-B. S. & Nielsen, S. B. (2010). UV Photodissociation of protonated Gly-Trp and Trp-Gly Dipeptides and Their Complexes with Crown Ether in an Electrostatic Ion Storage Ring. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 114, 299-303. https://doi.org/10.1021/jp9086317

Ryhding, T., Kirketerp, M.-B. S., Kadhane, U., Lykkegaard, M. K., Panja, S., Nielsen, S. B. & Nielsen, M. B. (2008). Upon the intrinsic optical properties of oligo(p-phenyleneethynylene)s (OPEs). Synthesis of OPE3 for experimental gas-phase absorption studies. Tetrahedron, 64, 11475-11479.

Milne, B. F., Toker, Y., Rubio, A. & Nielsen, S. B. (2015). Unraveling the intrinsic color of chlorophyll. Angewandte Chemie International Edition, 54(7), 2170-2173. https://doi.org/10.1002/anie.201410899

Johansson, H., Zettergren, H., Holm, A., Schmidt, H. T., Haag, N., Cederquist, H., Nielsen, S. B., Wyer, J. A., Kirketerp, M.-BS., Støchkel, K. & Hvelplund, P. (2011). Unimolecular dissociation of anthracene and acridine cations: The importance of isomerization barriers for the C H loss and HCN loss channels. Journal of Chemical Physics, 135(8). https://doi.org/10.1063/1.3626792

Lindkvist, T. T., Djavani-Tabrizi, I., Andersen, L. H. & Nielsen, S. B. (2025). Turning on the Fluorescence from Isolated GFP Chromophore Anions at Cryogenic Temperatures. Physical Review Letters, 134(9), Artikel 093001. https://doi.org/10.1103/PhysRevLett.134.093001

Svendsen, A., Bluhme, H., El-Ghazaly, M. A. O., Seiersen, K., Nielsen, S. B. & Andersen, L. H. (2005). Tuning the continuum ground state energy of NO₂^2- by water molecules. Physical Review Letters, 94, 223401-.

Gruber, E., Teiwes, R., Kjær, C., Brøndsted Nielsen, S. & Andersen, L. H. (2022). Tuning fast excited-state decay by ligand attachment in isolated chlorophylla. Physical Chemistry Chemical Physics, 24(1), 149-155. https://doi.org/10.1039/d1cp04356k

Balakrishnan, G., Hu, Y., Nielsen, S. B. & Spiro, T. G. (2005). Tunable kHz deep ultraviolet (193-210 nm) laser for Raman applications. Applied Spectroscopy, 59(6), 776.

Nielsen, S. B., Andersen, J. U., Hvelplund, P., Jørgensen, T. J. D., Sørensen, M. & Tomita, S. (2002). Triply charged bradykinin and gramicidin radical cations: Their formation and the selective enhancement of charge-directed cleavage processes. Int. J. Mass. Spectrom., 213, 225.

Zhao, Y., Sørensen, E. R., Lindkvist, T. T., Kjær, C., Brøndsted Nielsen, M., Chen, L. & Brøndsted Nielsen, S. (2021). Triangular Rhodamine Triads and Their Intrinsic Photophysics Revealed from Gas-Phase Ion Fluorescence Experiments. Chemistry - A European Journal, 27(42), 10875-10882. https://doi.org/10.1002/chem.202101322

Turecek, F., Jones, J. W., Holm, A. I. S., Panja, S., Nielsen, S. B. & Hvelplund, P. (2009). Transition metals as electron traps. I. Structures, energetics, electron capture, and electron-transfer-induced dissociations of ternary copper-peptide complexes in the gas phase. Journal of Mass Spectrometry, 44(5), 707-724. https://doi.org/10.1002/jms.1546

Turecek, F., Holm, A. I. S., Panja, S., Nielsen, S. B. & Hvelplund, P. (2009). Transition metals as electron traps. II. Structures, energetics and electron transfer dissociations of ternary Co, Ni and Zn-peptide complexes in the gas phase. Journal of Mass Spectrometry, 44(10), 1518-1531. https://doi.org/10.1002/jms.1642

Stockett, M. H. & Nielsen, S. B. (2016). Transition energies of benzoquinone anions are immune to symmetry breaking by a single water molecule. Physical Chemistry Chemical Physics, 18(10), 6996-7000. https://doi.org/10.1039/c5cp06095h

Nielsen, S. B., Brøndsted Nielsen, M. & Aagaard Jensen, H. J. (2003). The tetrathiafulvalene dication in the gas phase: Its formation and stability. Physical Chemistry Chemical Physics, 5, 1376.

Stockett, M. H., Musbat, L., Kjær, C., Houmøller, J., Toker, Y., Rubio, A., Milne, B. F. & Brøndsted Nielsen, S. (2015). The Soret absorption band of isolated chlorophyll a and b tagged with quaternary ammonium ions. Physical Chemistry Chemical Physics, 17, 25793-25798. https://doi.org/10.1039/c5cp01513h

Panja, S., Hvelplund, P., Nielsen, S. B. & Uggerud, E. (2009). The reduction of water clusters H⁺ (H₂O)_n to (OH^-)(H₂O)_m by double electron transfer from Cs atoms. Physical Chemistry Chemical Physics, 11, 6125-6131. https://doi.org/10.1039/b903517f

Turecek, F., Chung, T. W., Moss, C. L., Wyer, J., Ehlerding, A., Holm, A. I. S., Zettergren, H., Nielsen, S. B., Hvelplund, P., Chamot-Rooke, J., Bythell, B. & Paizs, B. (2010). The Histidine Effect. Electron Transfer and Capture Cause Different Dissociations and Rearrangements of Histidine Peptide Cation-Radicals. Journal of the American Chemical Society, 132(31), 10728-10740. https://doi.org/10.1021/ja907808h

Langeland, J., Kjær, C., Andersen, L. H. & Brøndsted Nielsen, S. (2018). The Effect of an Electric Field on the Spectroscopic Properties of the Isolated Green Fluorescent Protein Chromophore Anion. ChemPhysChem, 19(14), 1686-1690. https://doi.org/10.1002/cphc.201800225

Andersen, J. U., Hvelplund, P., Nielsen, S. B., Tomita, S., Wahlgreen, H., Møller, S. P., Pedersen, U. V., Forster, J. S. & T.J.D., J. (2002). The combination of an electrospray ion source and an electrostatic storage ring for lifetime and spectroscopy experiments on biomolecules. Review of Scientific Instruments, 73, 1284.

Andersen, J. U., Hvelplund, P., Nielsen, S. B., Tomita, S., Wahlgreen, H., Møller, S. P., Pedersen, U. V., Forster, J. & Jørgensen, T. J. D. (2002). The combination of an electrospray ion source and an electrostatic storage ring for lifetime and spectroscopy experiments on biomolecules. Review of Scientific Instruments, 73(3), 1284.

Djavani-Tabrizi, I., Lindkvist, T. T., Langeland, J., Kjær, C., Graham, M., Kjaergaard, H. G. & Nielsen, S. B. (2024). Tautomer-Selective Fluorescence Spectroscopy of Oxyluciferin Anions. Journal of the American Chemical Society, 146(39), 26975-26982. https://doi.org/10.1021/jacs.4c08596

Wyer, J., Ehlerding, A., Zettergren, H., Kirketerp, M.-B. S. & Nielsen, S. B. (2009). Tagging of Protonated Ala-Tyr and Tyr-Ala by Crown Ether Prevents Direct Hydrogen Loss and Proton Mobility after Photoexcitation: Importance for Gas-Phase Absorption Spectra, Dissociation Lifetimes, and Channels. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 113(33), 9277-9285. https://doi.org/10.1021/jp904053d

Nielsen, S. B., Chakraborty, T. & Hoffmann, S. V. (2005). Synchrotron radiation circular dichroism spectroscopy of ribose and deoxyribose sugars, adenosine, AMP and dAMP nucleotides. ChemPhysChem, 6, 2619-2624.

Holm, A. I. S., Kohler, B., Hoffmann, S. V. & Nielsen, S. B. (2010). Synchrotron Radiation Circular Dichroism of Various G-Quadruplex Structures. Biopolymers, 93(5), 429-433. https://doi.org/10.1002/bip.21354

Holm, A. I. S., Worm, E. S., Kadhane, U., Chakraborty, T., Hoffmann, S. V. & Nielsen, S. B. (2007). Synchrotron radiation circular dichroism of DNA single strands and hybrids. Asian Chem. Lett., 11(3 & 4), 225-230.

Wanko, M., Houmøller, J., Støchkel, K., Suhr Kirketerp, M.-B., Petersen, M. Å., Nielsen, M. B., Nielsen, S. B. & Rubio, A. (2012). Substitution effects on the absorption spectra of nitrophenolate isomers. Physical Chemistry Chemical Physics, 14(37), 12905-11. https://doi.org/10.1039/c2cp41636k

Andersen, J. U., Hvelplund, P., Lapierre, A., Møller, S. P., Nielsen, S. B., Pedersen, U. V., Tomita, S., Langouche, G. (red.) & de Waard, H. (red.) (2003). Studies of Clusters and Biomolecules in ELISA. Afhandling præsenteret på APAC 2001, Århus, Danmark.

Pedersen, S. Ø., Byskov, C. S., Turecek, F. & Nielsen, S. B. (2014). Structures of protonated thymine and uracil and their monohydrated gas-phase ions from ultraviolet action spectroscopy and theory. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 118(24), 4256-4265. https://doi.org/10.1021/jp504153p

Taylor, C. J., Burke, R. M., Wu, B., Panja, S., Nielsen, S. B. & Dessent, C. (2009). Structural characterization of negatively charged glycosaminoglycans using high-enegy (50-150 keV) collisional activation. International Journal of Mass Spectrometry, 285(1-2), 70-77. https://doi.org/10.1016/j.ijms.2009.04.009

Kjaer, C., Stockett, M. H., Pedersen, B. M. & Nielsen, S. B. (2016). Strong Impact of an Axial Ligand on the Absorption by Chlorophyll a and b Pigments Determined by Gas-Phase Ion Spectroscopy Experiments. Journal of Physical Chemistry B, 120(47), 12105-12110. https://doi.org/10.1021/acs.jpcb.6b10547

Kadhane, U., Holm, A. I. S., Hoffmann, S. V. & Nielsen, S. B. (2008). Strong coupling between adenine nucleobases in DNA single strands revealed by circular dichroism using synchrotron radiation. Physical Review E, 77(021901).

Andersen, J. U., Hvelplund, P., Nielsen, S. B., Pedersen, U. V. & Tomita, S. (2002). Statistical electron emission after laser excitation of C-,6₀ ions from an electtrospray ion source. Physical Review A, 65, 53202.

Drenck, K., Jensen, F., Olsen, J. & Nielsen, S. B. (2008). Stability of the three tetracoordinated dianions Ni(CN)^2-₄, Cr(SCN)^2-_{4 ,}and Cu(N₃)^2-₄. Chemical Physics, 353, 189-192.

Hvelplund, P., Kurten, T., Støchkel, K., Ryding, M. J., Nielsen, S. B. & Uggerud, E. (2010). Stability and Structure of Protonated Clusters of Ammonia and Water, H⁺(NH₃)_m (H₂O)_n. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 114(27), 7301-7310. https://doi.org/10.1021/jp104162k

Sunden, A. E. K., Stochkel, K., Hvelplund, P., Nielsen, S. B., Dynefors, B. & Hansen, K. (2018). Stabilities of protonated water-ammonia clusters. Journal of Chemical Physics, 148(18), Artikel 184306. https://doi.org/10.1063/1.5023620

Nielsen, S. B., Nielsen, M. B. & Rubio, A. (2014). Spectroscopy of nitrophenolates in vacuo: effect of spacer, configuration, and microsolvation on the charge-transfer excitation energy. Accounts of Chemical Research, 47(4), 1417-25. https://doi.org/10.1021/ar500025h

Wyer, J. & Nielsen, S. B. (2013). Spectroscopy of Ferric Heme and Protoporphyrin IX Ions In Vacuo. I S. B. Nielsen & J. A. Wyer (red.), Photophysics of Ionic Biochromophores (s. 117-139). Springer. https://doi.org/10.1007/978-3-642-40190-9_7

Kjaer, C., Nielsen, S. B. & Stockett, M. H. (2017). Sibling rivalry: intrinsic luminescence from two xanthene dye monoanions, resorufin and fluorescein, provides evidence for excited-state proton transfer in the latter. Physical Chemistry Chemical Physics, 19(36), 24440-24444. https://doi.org/10.1039/c7cp04689h

Baardseth Nielsen, A., Hvelplund, P. & Nielsen, S. B. (2004). Ruthenium diimine complexes in unusual charge states formed in collisional electron transfer. International Journal of Mass Spectrometry, 232(1), 79-82.

Kirketerp, M.-B. S., Ryhding, T., Støchkel, K., Brøndsted Nielsen, M. & Nielsen, S. B. (2011). Role of Nearby Charges on the Electronic Structure of π-Conjugated Molecules: Symmetric versus Asymmetric Charge Distributions in Oligo(p-phenyleneethynylene). Journal of Physical Chemistry, A(115), 1222-1227. https://doi.org/10.1021/jp111134t

Zettergren, H., Domaracka, A., Schlathölter, T., Bolognesi, P., Díaz-Tendero, S., Łabuda, M., Tosic, S., Maclot, S., Johnsson, P., Steber, A., Tikhonov, D., Castrovilli, M. C., Avaldi, L., Bari, S., Milosavljević, A. R., Palacios, A., Faraji, S., Piekarski, D. G., Rousseau, P. ... Petrignani, A. (2021). Roadmap on dynamics of molecules and clusters in the gas phase. European Physical Journal D, 75(5), Artikel 152. https://doi.org/10.1140/epjd/s10053-021-00155-y

Ovchinnikov, S. Y., Macek, J., Tuinman, A. A., Steill, J. D., Compton, R. N., Hvelplund, P., Holm, A. I. S., Nielsen, S. B. & Brøndsted Nielsen, M. (2006). Quantum phase interference effects in anion to dianion charge-exchange collisions. Physical Review A, 73.

Lindkvist, T. T., Benzenberg, L. R., Nielsen, S. B. & Zenobi, R. (2025). Proximity-Induced Fluorescence Quenching in Rhodamine Systems In Vacuo: Effect of Charges and Aromatic Moieties. Journal of Physical Chemistry A, 129(22), 4936-4943. https://doi.org/10.1021/acs.jpca.5c03150

Nielsen, S. B. & Andersen, L. H. (2006). Properties of microsolvated ions: From the microenvironment of chromophore and alkali metal ions in proteins to negative ion in water clusters. Biophysical Chemistry, 124, 229-237.

Bojesen, G., Hvelplund, P., Jørgensen, T. J. D. & Nielsen, S. B. (2000). Probing the lowest coordination number of dianionic platinum-cyanide complexes in the gas phase: Dynamics of the charge dissociation process. Journal of Chemical Physics, 113, 6608.

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Karin Vittrup