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Publications (K. Oum)

2022

(79) Morgenroth, M., Scholz, L. Guy, D. H., Oum, K. and Lenzer, T., Spatiotemporal Mapping of Efficient Chiral Induction by Helicene-Type Additives in Copolymer Thin Films, Angewandte Chemie International Edition, doi:10.1002/anie.202203075 (2022), Angewandte Chemie, doi:10.1002/ange.202203075 (2022).      Open access

(78) Morgenroth, M., Scholz, M., Cho, M. J., Choi, D. H., Oum, K. and Lenzer, T., Mapping the broadband circular dichroism of copolymer films with supramolecular chirality in time and space, Nature Communications, 13, 210 (2022).   Open access

 

2021 

(77) Morgenroth, M., Scholz, M., Guy, L., Oum, K., Lenzer, T., Ultrafast excited-state dynamics of thin films consisting of helicene-like molecules based on dibenzo[c,h]acridine, Molecular Physics, Troe-Festschrift, submitted (2021).

(76) Merker, A., Scholz, M., Morgenroth, M., Lenzer, T., Oum, K., "Photoinduced dynamics of (CH3NH3)4Cu2Br6 thin films indicating efficient triplet photoluminescence", J. Phys. Chem. Lett., 12, 2736 (2021).  Abstract

 

2020

(75) Kentsch, R., Morgenroth, M., Scholz, M., Xu, K., Schmedt auf der Günne, J., Lenzer, T., Oum, K.*, "Direct observation of the exciton self-trapping process in CsCu2I3 thin films", J. Phys. Chem. Lett., 11, 4286 (2020).       Abstract

(74) Morgenroth, M., Scholz, M., Lenzer, T.,* Oum, K.,* "Ultrafast UV-vis transient absorption and circular dichroism spectroscopy of a polyfluorene copolymer showing large chiral induction", J. Phys. Chem. C., 124 (18), 10192 (2020).       Abstract

(73) Scholz, M., Hoffmann, C., Klein, J. R., Wirtz, M., Jung, G. and Oum, K.,* "Exploring differences in excited-state properties in styryl-BODIPY chromophores upon change from α- to β-substitution", Z. Phys. Chem., 234 (11-12), 1735 (2020).      Abstract

 

2019

(72) Scholz, M., Morgenroth, M., Cho, M. J., Choi, D. H., Lenzer, T.,* Oum, K.,"Coherent acoustic phonon dynamics in chiral copolymers", Struct. Dyn., 6, 064502 (2019)       Open acess

(71) Scholz, M., Bablich, A., Kienitz, P., Bornemann, R., Haring Bolívar, P., Lenzer, T., Oum, K.*, "Ultrafast Carrier Recombination and Transient Lattice Temperature Changes in 25 nm Thin Hydrogenated Amorphous Silicon Films", ACS Appl. Electron. Mater., 1, 2396 (2019)      Abstract

(70) Scholz, M., Morgenroth, M., Cho, M. J., Choi, D. H., Oum, K.,* Lenzer, T.,*, "Ultrafast broadband transient absorption and circular dichroism reveal relaxation of a chiral copolymer", J. Phys. Chem. Lett., 10, 5160 (2019).       Abstract

(69) Horn, J., Scholz, M., Oum, K.,* Lenzer, T.* and Schlettwein, D.*, "Influence of phenylethylammonium iodide as additive in the formamidinium tin iodide perovskite on interfacial characteristics and charge carrier dynamics", APL Materials (Special Issue for "Perovskite Semiconductors"), 7, 031112 (2019).  Abstract

 

2018

(68) Kentsch, R., Scholz, M., Horn, J., Schlettwein, D.,* Oum, K.* and Lenzer, T.,* "Exciton Dynamics and Electron-Phonon Coupling Affect the Photovoltaic Performance of the Cs2AgBiBr6 Double Perovskite", J. Phys. Chem. C, 122, 25709.    Abstract       Cover

(67) Ehlers, F., Scholz, M., Oum, K.* and Lenzer, T., "Excited-state dynamics of 3,3’-dihydroxyisorenieratene and (3R,3’R)-zeaxanthin: Observation of vibrationally hot S0 species", Archives of Biochemistry and Biophysics (Special Issue for "Carotenoids"), 646, 137 (2018).     Abstract

(66) Scholz, M., Oum, K. and Lenzer, T.*, "Pronounced exciton and coherent phonon dynamics in BiI3", Phys. Chem. Chem. Phys., 20, 10677 (2018).  Abstract 

(65) Klein, J. R., Scholz, M., Oum, K.* and Lenzer, T., "Intramolecular and interfacial dynamics of triarylamine-based hole transport materials", Photochem. Photobiol. Sci. (Special Web-Issue for "ICP-Strasbourg"), 17, 722 (2018). Abstract    Cover 

(64) Scholz, M., Morgenroth, M., Oum, K.* and Lenzer, T.,* "Exciton and coherent phonon dynamics in the metal-deficient defect perovskite (CH3NH3)3Sb2I9", J. Phys. Chem. C, 122, 5854 (2018).     Abstract

 

2017

(63) Scholz, M., Flender, O., Oum, K.* and Lenzer, T., "Ultrafast excited-state dynamics of all-trans capsanthin in organic solvents", J. Phys. Chem. A, 121, 8380 (2017).  Abstract

(62) Scholz, M., Flender, O., Oum, K.* and Lenzer, T.,* "Pronounced exciton dynamics in the vacancy-ordered bismuth halide perovskite (CH3NH3)3Bi2I9 observed by ultrafast UV-Vis-NIR transient absorption spectroscopy", J. Phys. Chem. C, 121, 12110  (2017).  Abstract

(61) Klein, J. R., Scholz, M., Oum, K.* and Lenzer, T.,* "Quantifying ultrafast carrier injection from methylammonium lead iodide into the hole-transport material H101 and mesoporous TiO2 using Vis-NIR transient absorption", Phys. Chem. Chem. Phys., 19, 17952  (2017).  Abstract

(60) Klein, J. R., Scholz, M., Oum, K.* and Lenzer, T.,* "Photoinduced dynamics of the hole-transport material in organic solvents and on mesoporous Al2O3 and TiO2 thin films", Phys. Chem. Chem. Phys., 19, 21748  (2017).  Abstract

(59) Scholz, M., Flender, O., Boschloo, G., Oum, K.* and Lenzer, T.,* "Ultrafast electron and hole transfer dynamics of a solar cell dye containing hole acceptors on mesoporous TiO2 and Al2O3", Phys. Chem. Chem. Phys., 19, 7158 (2017).  Abstract

 

2016

(58) Flender, O., Scholz, M., Klein, J. R., Oum, K.* and Lenzer, T.,* "Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al2O3 and TiO2 thin films", Phys. Chem. Chem. Phys., 18, 26010 (2016).   Open Access

(57) Flender, O., Scholz, M., Hölzer, J., Oum, K.* and Lenzer, T.,* "A comprehensive picture of the ultrafast excited-state dynamics of retinal", Phys. Chem. Chem. Phys., 18, 14941 (2016).   Open Access

(56) Klein, J. R., Flender, O., Scholz, M., Oum, K.* and Lenzer, T.,* "Charge carrier dynamics of methylammonium lead iodide: from PbI2-rich to low-dimensional broadly emitting perovskites", Phys. Chem. Chem. Phys., 18, 10800 (2016). (Official themed issue of Bunsentagung 2016: Basic Mechanisms in Energy Conversion) 

 

2015

(55) Flender, O., Lohse, P.W., Du, J., Oekermann, T., Scholz, M., Oum, K.* and Lenzer, T.,* "Ultrafast dynamics of the indoline dye D149 on mesoporous ZnO and Al2O3 thin films", Zeitschrift für Physikalische Chemie (Troe-Festschrift), 229, 1907 (2015). Abstract

(54) Flender, O., Klein, J. R., Lenzer, T.* and Oum, K.,* "Ultrafast photoinduced dynamics of the organolead trihalide perovskite CH3NH3PbI3 on mesoporous TiO2 scaffolds in the 320-920 nm range", Phys. Chem. Chem. Phys., 17, 19238 (2015). Open Access

(53) Ehlers, F., Scholz, M., Lenzer, T. and Oum, K.,* "Excited state dynamics of selected all-trans C40 xanthophyll carotenoids", Zeitschrift für Physikalische Chemie (Troe-Festschrift), 229, 1815 (2015).  Abstract   Cover page

(52a) Tietze, L.F.,* Waldecker, B., Ganapathy, D., Eichhorst, C., Lenzer, T., Oum, K., Reichmann, S.O. and Stalke, D., "Four- and Sixfold Tandem-Domino Reactions Leading to Dimeric Tetrasubstituted Alkenes Suitable as Molecular Switches", Angewandte Chemie International Edition, 54, 10317  (2015). Abstract

(52b) Tietze, L.F.,* Waldecker, B., Ganapathy, D., Eichhorst, C., Lenzer, T., Oum, K., Reichmann, S.O. und Stalke, D., "Vier- und sechsfache Tandem-Dominoreaktionen zur Synthese von dimeren tetrasubstituierten Alkenen als molekulare Doppelschalter", Angewandte Chemie, 127, 10457  (2015). Abstract

(51) Ehlers, F., Scholz, M., Schimpfhauser, J., Bienert, J., Oum, K. and Lenzer, T.,* "Collisional relaxation of apocarotenals: Identifying the S* state with vibrationally excited molecules in the ground electronic state S0*", Phys. Chem. Chem. Phys., 17, 10478 (2015).

 

2014

(50) Oum, K.,* Lenzer, T.,* Scholz, M., Jung, D. W., Sul, O., Cho, B. J., Lange, J. and Müller, A., "Observation of Ultrafast Carrier Dynamics and Phonon Relaxation of Graphene from the Deep UV to the Visible Region", J. Phys. Chem. C, 118, 6454 (2014). Open Access

(49) Oum, K., Flender, O., Lohse, P.W., Scholz, M., Hagfeldt, A., Boschloo, G. and Lenzer, T.,* "Electron and hole transfer dynamics of a triarylamine-based dye with peripheral hole acceptors on TiO2 in the absence and presence of solvent", Phys. Chem. Chem. Phys., 16, 8019 (2014). Abstract

(48) Ernsting, N. P.,  Lenzer, T. and Oum, K., "Time-resolved laser spectroscopy of nonreactive processes in ionic liquids and their binary mixtures with organic solvents and CO2", Journal of Molecular Liquids (Review article), 192, 87 (2014). Abstract

 

2013

 

(47) Tietze, A. A., Bordusa, F., Giernoth, R., Imhof, D., Lenzer, T., Maaß, A., Mrestani-Klaus, C., Neundorf, I., Oum, K., Reith, D. and Stark, A., "On the nature of interactions between ionic liquids and small amino acid-based biomolecules", ChemPhysChem, Review article, 14, 4044 (2013). Abstract

(46) Oum, K., Lohse, P.W., Klein, J.R., Flender, O., Scholz, M., Hagfeldt, A., Boschloo, G. and Lenzer, T.*, "Photoinduced Ultrafast Dynamics of the Triphenylamine-Based Organic Sensitizer D35 on TiO2, ZrO2 and in Acetonitrile", Phys. Chem. Chem. Phys., 15, 3906 (2013). Abstract

(45) Arden-Jacob,J., Drexhage, K., Druzhinin, S.I., Ekimova,E., Flender,O., Lenzer,T.,* Oum, K. and Scholz M., "Ultrafast photoinduced dynamics of the 3,6-diaminoacridinium derivative ATTO 465 in solution", Phys. Chem. Chem. Phys. 15, 1844 (2013). Abstract


2012

(44) Oum, K., Lohse, P. W., Flender, O., Klein, J. R., Scholz, M., Lenzer, T.,* Du, J. and Oekermann, T., "Ultrafast dynamics of the indoline dye D149 on electrodeposited ZnO and sintered ZrO2 and TiO2 thin films", Phys. Chem. Chem. Phys. 14, 15429 (2012). Abstract 

(43) Lohse, P.W., Bartels, N., Stoppa, A., Buchner, R.,* Lenzer, T.* and Oum, K., "Dielectric relaxation and ultrafast transient absorption spectroscopy of [C6mim]+[Tf2N]- / acetonitrile mixtures, "Phys. Chem. Chem. Phys. 14, 3596 (2012). Abstract

(42) Ekimova, M., Fröhlich, D., Stalke, S., Lenzer, T.* and Oum, K.,* "Probing the local polarity of alkylammonium formate ionic liquids and their mixtures with water using a carbonyl carotenoid",  Chem. Phys. Chem., 13, 1854 (2012). Abstract

 

2011

(41) Lohse, P.W., Kuhnt, J., Druzhinin, S.I., Scholz, M., Ekimova, M., Oekermann, T., Lenzer, T.* and Oum, K.,* "Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents", Phys. Chem. Chem. Phys., 13, 19632 (2011). Abstract

(40) Tietze, L.F.,* Düfert, M.A., Hungerland, T., Oum, K., and Lenzer, T., "Synthesis and Photochemical Investigations of Tetrasubstituted Alkenes as Molecular Switches - The Effect of Substituents", Chem. Eur. J., 17, 8452 (2011).  Abstract

(39) Golibrzuch, K., Ehlers, F., Scholz, M., Oswald, R., Lenzer, T.,* Oum, K., Kim, H., and Koo, S.,* "Ultrafast excited state dynamics and spectroscopy of 13,13'-diphenyl-beta-carotene", Phys. Chem. Chem. Phys., 13, 6340 (2011). Abstract

 

2010

(38) Lenzer, T.,* Lohse, P. W., Ehlers, F., Kopczynski, M. and Oum, K.,* "12'-Apo-β-caroten-12'-al: A Unique 'Spy' Molecule for Probing Local Interactions in Ionic Liquids", Angewandte Chemie International Edition, 49, 2230 (2010); 122, 2277 (2010). Abstract

(37) Lohse, P. W., Ehlers, F., Oum, K.,* Scholz, M. and Lenzer, T.,* "Ultrafast solvation dynamics of 12'-apo-β-carotenoic-12'-acid in [C6mim]+[Tf2N]-", Chemical Physics, 373, 45 (2010). Abstract

(36) Lenzer, T., Bürsing, R., Dittmer, A., Panja, S.S, Wild, D.A. and Oum, K.,* "Rotational and vibrational cooling in pulsed high-pressure molecular beam expansions from 3 bar into the supercritical regime", Journal of Physical Chemistry A, 114, 6377 (2010). Abstract

(35) Lenzer, T., Ehlers. F., Scholz. M., Oswald. R. and Oum K.,* "Assignment of carotene S* state features to the vibrationally hot ground electronic state", Physical Chemistry Chemical Physics, 12, 8832 (2010).  Abstract

 

2009

(34) Lenzer, T.,* Schubert, S., Ehlers, F., Lohse, P. W., Scholz, M. and Oum, K.,* "Femtosecond pump-supercontinuum probe and transient lens spectroscopy of adonixanthin", Archives of Biochemistry and Biophysics, 483, 213 (2009).  Abstract

(33) Tietze, L. F.,* Düfert, A., Lotz, F., Sölter, L., Oum, K., Lenzer, T., Beck, T. and Herbst-Irmer, R., "Synthesis of chiroptical molecular switches by Pd-catalyzed domino reactions", J. Am. Chem. Soc., 131, 17879 (2009).  Abstract

 

2008

(32) Ehlers, F., Lenzer, T., Oum, K.,* "Excited-State Dynamics of 12'-Apo-b-caroten-12'-al and 8'-Apo-b-caroten-8'-al in Supercritical CO2, N2O, and CF3H", Journal of Physical Chemistry B112, 16690 (2008).  Abstract

(31) Stalke, S., Wild, D.A., Lenzer, T.* and Oum, K.,* "Solvent-dependent ultrafast internal conversion dynamics of n'-apo-b-carotenoic-n'-acids (n = 8, 10, 12)", Phys. Chem. Chem. Phys, 10, 2180 (2008).  Abstract  

(30) Lohse, P.W., Bürsing, R., Lenzer, T.* and Oum, K.,* "Exploring 12'-apo-b-carotenoic-12'-acid as an ultrafast polarity probe for ionic liquids", Journal of Physical Chemistry B, 112, 3048. (2008).  Abstract

(29) Lenzer, T. and Oum, K., "Investigation of internal conversion dynamics of carotenoids using femtosecond pump-supercontinuum probe (PSCP) spectroscopy", Carotenoid Science, 12, 28 (2008).

 

2007

(28) Kopczynski, M., Ehlers, F., Lenzer, T.,* Oum, K., "Evidence for an Intramolecular Charge Transfer State in 12'-Apo-b-caroten-12'-al and 8'-Apo-b-caroten-8'-al: Influence of solvent Polarity and Temperature", Journal of Physical Chemistry A111, 5370 (2007).  Abstract

(27) Ehlers, F., Wild, D.A., Lenzer, T.* and Oum K, "Investigation of the S1/ICT - S0 internal conversion lifetime of 4'-apo-b-carotenoic-4'-al and 8'-apo-b-carotenoic-8'-al: Dependence on conjugation length and solvent polarity",  Journal of Physical Chemistry A111, 2257 (2007).  Abstract

(26) Harrison, J. J., Lee, C.,  Lenzer, T.* and Oum, K.,* "On-line in-situ characterization of CO2 RESS processes for benzoic acid, cholesterol and aspirin", Green Chemistry, 9, 351 (2007).  Abstract

(25) Bürsing, B., Lenzer, T.* and Oum K.,* "Density dependence of optical kerr lens signals in neat N2O and CO2", Chem. Phys., 331, 403 (2007).  Abstract

 

2006

(24) Wild D. A., Winkler K., Stalke S., Oum K. and Lenzer T.,* "Extremely strong solvent dependence of the S1-S0 internal conversion lifetime of 12'-Apo-b-caroten-12'-al", Phys. Chem. Chem. Phys., 8, 2499 (2006).  Abstract

(23) Lenzer T.,* Oum K.,* Seehusen J. and Seidel M.T.,"Transient Lens spectroscopy of ultrafast internal converion processes in citranaxanthin", Journal of Physical Chemistry A110, 3159 (2006).  Abstract

(22) Lee, C.,  Luther, K., Oum, K. and Troe J.,* "Pressure and temperature dependence of the recombination of p-Fluorobenzyl radicals", Journal of Physical Chemistry A110, 2613 (2006).  Abstract

(21) Chen, Z., Lee, C., Lenzer, T. and Oum, K.,* "Solvent effects on the S0-S2 transition of b-carotene, echinenone, canthaxanthin and astasanthin in supercritical CO2 and CF3H", Journal of Physical Chemistry A110, 11291 (2006).  Abstract

(20) Lenzer, T. and Oum, K., "Ultrafast primary processes in the photochemistry of carotenoids", MPI-bpc News, 1-2, 1 (2006)

 

2005

(19) Kopczynski M., Lenzer T.,* Oum K.,* Seehusen J., Seidel M. T. and Ushakov V. G., "Ultrafast transient lens spectroscopy of variou C40 carotenoids: lycopene, b-carotene, (3R, 3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, echinenone, canthaxanthin and astaxanthin", Phys. Chem. Chem. Phys., 7, 2793 (2005).  Abstract

(18) Luther K., Oum K. and Troe J.,* "The role of the radical-complex mechanism in the ozone recombination/dissociation reaction", Phys. Chem. Chem. Phys., 7, 2764 (2005).  Abstract

(17) Lenzer T., Oum K.,* Schroeder J. and Sekiguchi K., "Gas-phase collisional relaxation of the CH2I radical after UV photolysis of CH2I2", Journal of Physical Chemistry A109, 10824 (2005).  Abstract


2004 

(16) Luther, K., Oum, K., Sekiguchi, K. and Troe, J.,* "Recombination of benzyl radicals: dependence on the bath gas, temperature, and pressure", Phys. Chem. Chem. Phys., 6, 4133 (2004)    Abstract

(15) Oum, K., Luther, K. and Troe, J.,* "High-pressure studies of radical-solvent molecule interactions in the CCl3 and bromin combinaiton reactions of CCl3", J. Phys., Chem., A, 108, 2690 (2004).   Abstract

 

2003


(14) Oum, K.,* Harrison, J. J., Lee, C., Wild, D. A., Luther, K. and Lenzer, T.,* "On-line and in situ optical detection of particles of organic molecules formed by rapid expansion of supercritical solutions (RESS) of CO2", Phys. Chem. Chem. Phys., 5, 5467 (2003).

(13) Oum., K., Sekiguchi, K., Luther, K. and Troe, J.,* "Observation of unique pressure effects in the combination reaction of benzyl radicals in the gas to liquid transition region", Phys. Chem. Chem. Phys., 5, 2931 (2003).

(12) Luther, K., Oum, K., Sekiguchi, K. and Troe, J.,* "Kinetic studies of benzyl radicals in supercritical fluids", Proceedings of the 6th International Symposium on Supercritical Fluids, 2, 1223 (2003).

 

2001

(11) Luther, K., Oum, K. and Troe, J.,* "Study of recombination reaction CCl3 + O2 (+M) -> CCl3O2 (+M) at pressures of 2-900 bar and temperatures of 260-346 K", J. Phys. Chem. A, 105, 5535 (2001).

 

1999

(10) De Haan, D. O., Brauers, T., Oum, K., Stutz, S., Normeyer, T. and Finayson-Pitts, B. J.,* "Heterogeneous chemistry in the troposphere: experimental approaches and applications to the chemistry of sea salt particles", Int. Rev. Phys. Chem., 18, 343 (1999)

 

1998

(9) Oum, K., Lakin, M. J., De Haan, D. O., Brauers, T. and Finalyson-Pitts, B. J.,* "Formation of molecular chlorine from the photolysis of ozone and aqueous sea-salt particles", Science, 279, 74 (1998).

(8) Oum, K., Lakin, M. J., Finlayson-Pitts, B. J.,* "Bromine activation in the troposphere by the dark reaction of O3 with seawater ice", Geophys. Res. Lett., 25, 3923 (1998).

 

1997

(7) Hancock, G.,* Oum, K. and Moore, E. L., "The determination of product branching ratios by the time resolved Fourier Transform Infrared Emission", Res. Chem., Kin., 4, 97 (1997).

(6) Oum, K. and Hancock, G.,* "Infratred emission from the CF3+NO2 reaction", J. Phys. Chem. A, 101, 2634 (1997).

 

1996

(5) Brownsword, R. A., Hancock, G.* and Oum, K., "Infrared emission from the reaction of CHF with NO", J. Phys. Chem., 100, 4840 (1996). 


1994

(4) Jung, H. J., Kang, H. S., Oum, K., Lim, J. T., Hwang, J. S., Yo, C. H. and Choi, J. G.,* "Photoacoustic detection of CO oxidation reaction catalyzed by Nd1-xSrsCoO3-y using a differential photoacoustic cell", J. Kor. Chem. Soc., 38, 469 (1994).

 

1993

(3) Choi, J. G.,* Oum, K., Choi, C. Y., Moon, H., Shin, H. S., Park, S. M. and Chong, P. J., "The application of time-resolved laser induced fluorescence spectroscopy in the compexation studies of Eu(III) and Cm(III) with humig substances", Bull. Kor. Chem. Soc., 14, 72 (1993). 

 

1992

(2) Kang, H. S., Oum, K., Hwang, J. S., Yo, C. H. and Choi, J. G.,* "An application of optoacoustic technique for the CO oxidation reaction catalyzed by Gd1-xSrxCoO3-y", J. Kor. Chem. Soc., 37, 55 (1993).

(1) Chu, J. H., Bak, Y. H., Kang, B. K., Kim, U., Oum, K., Choi, J. G.* and Ko, D. S., "Michelson intergerometric detection for optoacoustic spectroscopy", Opt. Comm., 89, 135 (1992).