Institut for Fysik og Astronomi

Aarhus Universitets segl

Publications

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Lykkegaard, M. K., Ehlerding, A., Hvelplund, P., Kadhane, U., Kirketerp, M.-B. S., Nielsen, S. B., Panja, S., Wyer, J. & Zettergren, H. (2008). A Soret Marker Band for Four-Coordinate Ferric Heme Proteins from Absorption Spectra of Isolated Fe(lll)-Heme+ and Fe(lll)-Heme+(His) Ions in Vacuo. Journal of the American Chemical Society, (130), 11856-11857.
Lykkegaard, M. K., Zettergren, H., Kirketerp, M.-B. S., Ehlerding, A., Wyer, J., Kadhane, U. & Nielsen, S. B. (2009). Photodissociation of Isolated Ferric Heme and Heme-His Cations in an Electrostatic Ion Storage Ring. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 113(8), 1440-1444. https://doi.org/10.1021/jp809626v
Lucas, B., Barat, M., Fayeton, J., Perot, M., Jouvet, C., Grégoire, G. & Nielsen, S. B. (2008). Mechanisms of photoinduced Cα—Cβ bond breakage in protonated aromatic amino acids. Journal of Chemical Physics, 128(164302).
Liu, B., Hvelplund, P., Nielsen, S. B. & Tomita, S. (2004). Formation of C602- dianions in collisions between C60- and Na atoms. Physical Review Letters, 92, 168301.
Liu, B., Hvelplund, P., Nielsen, S. B. & Tomita, S. (2004). Hydrogen loss from nucleobase nitrogens upon electron attachment to isolated DNA and RnA nucleotide anions. Journal of Chemical Physics, 121, 4175.
Liu, B., Hvelplund, P., Nielsen, S. B. & Tomita, S. (2003). Electron loss and dissociation in high energy collsions between multiply charged oligonucleotide anions and noble gases. Int. J. Mass. Spectrom., 230, 19.
Liu, B., Tomita, S., Rangama, J., Hvelplund, P. & Nielsen, S. B. (2003). Electron attachment to "naked" and microsolvated nucleotide anions: Detection of long-lived dianions. ChemPhysChem, 4, 1341.
Liu, B., Hvelplund, P. & Nielsen, S. B. (2005). Multiply-charged negative clusters of adenosine-5'-monophosphate in the gas phase. J. Am. Soc. Mass Spectrom., 16, 1845.
Liu, B., Nielsen, S. B., Hvelplund, P., Zettergren, H., Cederquist, H., Manil, B. & Huber, B. A. (2006). Collision-induced dissociation of hydrated adenosine monophosphate nucleotide ions: Protection of the ion in water nanoclusters. Physical Review Letters, 97, 133401-1-4.
Liu, B., Hvelplund, P., Nielsen, S. B. & Tomita, S. (2006). Photodissociation of singly charged oligonucleotide cations: Arrhenius parameters and identification of nonstatistical processes. Physical Review A, 74, 052704.
Liu, B., Haag, N., Johansson, H., Schmidt, H. T., Cederquist, H., Nielsen, S. B., Zettergren, H., Hvelplund, P., Manil, B. & Huber, B. A. (2008). Electron capture induced dissociation of nucleotide anions in water nanodroplets. Journal of Chemical Physics, 128(075102).
Lindkvist, T. T., Langeland, J., Kjær, C. & Nielsen, S. B. (2024). Empirical Calibration of a Cylindrical Ion Trap for Mass-Selected Gas-Phase Fluorescence Spectroscopy. Journal of The American Society for Mass Spectrometry, 35(1), 123-130. https://doi.org/10.1021/jasms.3c00349
Lindkvist, T. T., Kjær, C., Langeland, J., Vogt, E., Kjaergaard, H. G. & Nielsen, S. B. (2024). Absorption and fluorescence spectroscopy of cold proflavine ions isolated in the gas phase. Journal of Chemical Physics, 160(18), Artikel 184306. https://doi.org/10.1063/5.0204331
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
Lindkvist, T. T., Sillesen, C., Klinkby, N., Jensen, H. H., Andersen, L. H. & Nielsen, S. B. (2025). Photophysics of a Methylated GFP Chromophore Anion in Vacuo. Journal of Physical Chemistry A, 129(19), 4245–4251. https://doi.org/10.1021/acs.jpca.5c02039
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
Lindkvist, T. T., Rasmussen, A. P., Klinkby, N., Andersen, L. H. & Nielsen, S. B. (2025). Cryogenic Ion Spectroscopy of the Ortho Green Fluorescent Protein Chromophore Anion. Journal of Physical Chemistry Letters, 16(51), 13277-13283. https://doi.org/10.1021/acs.jpclett.5c03293
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
Langeland, J., Lindkvist, T. T., Kjær, C. & Nielsen, S. B. (2024). Gas-phase Förster resonance energy transfer in mass-selected and trapped ions. Mass Spectrometry Reviews, 43(3), 477-499. https://doi.org/10.1002/mas.21828
Langeland, J., Christensen, N. F., Vogt, E., Kjær, C., Lindkvist, T. T., Nielsen, S. B. & Kjaergaard, H. G. (2023). Cryogenic Absorption and Emission Spectroscopy of the Oxyluciferin Anion In Vacuo. Journal of Physical Chemistry Letters, 14(25), 5949-5954. https://doi.org/10.1021/acs.jpclett.3c01206
Kjær, C., Lissau, H., Gravesen Salinas, N. K., Østergaard Madsen, A., Stockett, M. H., Storm, F. E., Holm Hansen, T., Andersen, J. U., Laursen, B. W., Mikkelsen, K. V., Brøndsted Nielsen, M. & Brøndsted Nielsen, S. (2019). Luminescence Spectroscopy of Rhodamine Homodimer Dications in Vacuo Reveals Strong Dye-Dye Interactions. ChemPhysChem, 20(4), 533-537. https://doi.org/10.1002/cphc.201800933
Kjær, C., Hansson, R. F., Hedberg, C., Jensen, F., Jensen, H. H. & Nielsen, S. B. (2020). Gas-phase action and fluorescence spectroscopy of mass-selected fluorescein monoanions and two derivatives. Physical Chemistry Chemical Physics, 22(17), 9210-9215. https://doi.org/10.1039/d0cp00453g
Kjær, C., Zhao, Y., Stockett, M. H., Chen, L., Hansen, K. & Nielsen, S. B. (2020). Gas-phase Förster resonance energy transfer in mass-selected ions with methylene or peptide linkers between two dyes: a concerted dance of charges. Physical Chemistry Chemical Physics, 22(19), 11095-11100. https://doi.org/10.1039/d0cp01287d
Kjær, C., Gruber, E., Nielsen, S. B. & Andersen, L. H. (2020). Color tuning of chlorophyll a and b pigments revealed from gas-phase spectroscopy. Physical chemistry chemical physics : PCCP, 22(36), 20331-20336. https://doi.org/10.1039/d0cp03210g
Kjær, C., Bull, J. N., Carrascosa, E., Nielsen, S. B. & Bieske, E. J. (2021). Action spectroscopy of isomer-selected luciferin anions. European Physical Journal D, 75(3), Artikel 72. https://doi.org/10.1140/epjd/s10053-021-00076-w
Kjær, C., Langeland, J., Lindkvist, T. T., Sørensen, E. R., Stockett, M. H., Kjaergaard, H. G. & Nielsen, S. B. (2021). A new setup for low-temperature gas-phase ion fluorescence spectroscopy. Review of Scientific Instruments, 92(3), Artikel 033105. https://doi.org/10.1063/5.0038880
Kjær, C., Langeland, J. & Nielsen, S. B. (2022). Intrinsic fluorescence from firefly oxyluciferin monoanions isolated in vacuo. Physical Chemistry Chemical Physics, 24(31), 18505-18510. https://doi.org/10.1039/d2cp02024f
Kjær, C., Vu-Phung, A., Toft Lindkvist, T., Langeland, J. & Brøndsted Nielsen, S. (2023). Cryogenic Ion Fluorescence Spectroscopy: FRET in Rhodamine Homodimers and Heterodimers. Chemistry - A European Journal, 29(60), Artikel e202302166. https://doi.org/10.1002/chem.202302166
Kjær, C., Vogt, E., Langeland, J., Christensen, N. F., Lindkvist, T. T., Kjaergaard, H. G. & Nielsen, S. B. (2023). Cryogenic fluorescence spectroscopy of oxazine ions isolated in vacuo. Physical Chemistry Chemical Physics, 25(47), 32715-32722. https://doi.org/10.1039/d3cp04615j
Kjær, C., Jones, N. C., Stockett, M. H., Hoffmann, S. V. & Nielsen, S. B. (2020). Circular dichroism, anisotropy and absorption spectroscopy of Chlorophyll b in methanol and mixed methanol-water solutions. Physical Chemistry Chemical Physics, 22(46), 26961-26966. https://doi.org/10.1039/D0CP03284K
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
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
Kjaer, C., Lisy, J. M. & Nielsen, S. B. (2018). Gas-Phase Ion Spectroscopy of Congo Red Dianions and Their Complexes with Betaine. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122(12), 3211-3227. https://doi.org/10.1021/acs.jpca.8b00904
Kirketerp, M.-B. S., Petersen, M. Å., Wanko, M., Leal, L. A. E., Zettergren, H., Raymo, F., Rubio, A., Nielsen, M. B. & Nielsen, S. B. (2009). Absorption Spectra of 4-Nitrophenolate Ions Measured in Vacuo and in Solution. ChemPhysChem, 10(8), 1207-1209. https://doi.org/10.1002/cphc.200900174
Kirketerp, M.-B. S., Petersen, M. Å., Wanko, M., Zettergren, H., Rubio, A., Nielsen, M. B. & Nielsen, S. B. (2010). Double-Bond versus Triple-Bond Bridges: Does it Matter for the Charge-Transfer Absorption by Donor-Acceptor Chromophores? ChemPhysChem, 11(12), 2495-2498. https://doi.org/10.1002/cphc.201000464
Kirketerp, M.-B. S. & Nielsen, S. B. (2010). Absorption spectrum of isolated tris(2,2'-bipyridine)ruthenium(II) dications in vacuo. International Journal of Mass Spectrometry, 297(1-3), 63-66. https://doi.org/10.1016/j.ijms.2010.05.019
Kirketerp, M.-B. S., Nielsen, S. B., Støchkel, K., Wyer, J., Hansen, C. N. & Kristensen, M. B. (2011). On the stability of isolated Pt(SCN)2-4 dianions in vacuo and action spectroscopy experiments. Chemical Physics Letters, 502(1-3), 53-56. https://doi.org/10.1016/j.cplett.2010.12.025
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
Kirketerp, M.-B. S., Espinosa Leal, L. A., Varsano, D., Rubio, A., Jørgensen, T. J. D., Kilså, K., Brøndsted Nielsen, M. & Nielsen, S. B. (2011). On the intrinsic optical absorptions by tetrathiafulvalene radical cations and isomers. Chemical Communications, 6900-6902. https://doi.org/10.1039/c1cc11936b
Kelly, O., Calvert, C. R., Greenwood, J. B., Zettergren, H., Nielsen, S. B. & Wyer, J. A. (2012). Effects of Charge Location on the Absorptions and Lifetimes of Protonated Tyrosine Peptides in Vacuo. Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 116(7), 1701-1709. https://doi.org/10.1021/jp208578w
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).
Kadhane, U., Holm, A. I. S., Hoffmann, S. V. & Nielsen, S. B. (2008). Effect of the electronic coupling in dinucleotides and oligonucleotides of adenine and thymine from synchrotron radiation absorption and circular dichroism. Journal of Photochemistry and Photobiology, A: Chemistry, 197, 110-114.
Kadhane, U., Andersen, J. U., Ehlerding, A., Hvelplund, P., Kirketerp, M.-B. S., Lykkegaard, M. K., Nielsen, S. B., Panja, S., Wyer, J. & Zettergren, H. (2008). Photodissociation of protonated tryptophan and alteration of dissociation pathways by complexation with crown ether. Journal of Chemical Physics, 129(18), 184304.
Kadhane, U., Andersen, J. U., Bonderup, E., Concina, B. J. M. F., Hvelplund, P., Kirketerp, M.-B. S., Liu, B., Nielsen, S. B., Panja, S., Rangama, J., Støchkel, K., Tomita, S., Zettergren, H., Hansen, K., Sundén, A. E. K., Canton, S. E., Echt, O. & Forster, J. S. (2009). Near-infrared photoabsorption by C60 dianions in a storage ring. Journal of Chemical Physics, 131(014301). https://doi.org/10.1063/1.3149775
Kadhane, U., Pérot, M., Lucas, B., Barat, M., Fayeton, J. A., Jouvet, C., Ehlerding, A., Kirketerp, M.-B. S., Nielsen, S. B., Wyer, J. & Zettergren, H. (2009). Photodissociation of protonated tryptamine and its supramolecular complex with 18-crown-6 ether: Dissociation times and channels, absorption spectra, and excited states calculations. Chemical Physics Letters, 480(1-3), 57-61. https://doi.org/10.1016/j.cplett.2009.08.064
Jørgensen, P., Forster, J. S., Hvelplund, P., Nielsen, S. B. & Tomita, S. (2001). Probing hydren bond network formation in anion-water clusters through high energy collision experiments. Journal of Chemical Physics, 115, 5101.
Jones, N. C., Nielsen, S. B. & Hoffmann, S. V. (2020). On the delocalization length in RNA single strands of cytosine: how many bases see the light? Physical Chemistry Chemical Physics, 22(4), 2188-2192. https://doi.org/10.1039/c9cp05292e
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
Jensen, C. S., Wyer, J. & Nielsen, S. B. (2010). Electron capture induced dissociation of dipeptide dications: where does the charge go? Physical Chemistry Chemical Physics, 12(40), 12961-12963. https://doi.org/10.1039/c0cp00592d
Jensen, C. S., Wyer, J. A., Houmøller, J., Hvelplund, P. & Nielsen, S. B. (2011). Electron-capture induced dissociation of doubly charged dipeptides: on the neutral losses and N-Cα bond cleavages. Physical Chemistry Chemical Physics, 13(41), 18373-8. https://doi.org/10.1039/c1cp21549c

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Revideret 29.01.2024
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Karin Vittrup