Search Results - "Buma, W. J"

Red spectral shift and enhanced quantum efficiency in phonon-free photoluminescence from silicon nanocrystals by Yassievich, I. N, Timmerman, D, Buma, W. J, Gregorkiewicz, T, de Boer, W. D. A. M, Dohnalová, K, Zhang, H

“…Crystalline silicon is the most important semiconductor material in the electronics industry. However, silicon has poor optical properties because of its…”
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Controlling forward and backward rotary molecular motion on demand by Pfeifer, L., Crespi, S., van der Meulen, P., Kemmink, J., Scheek, R. M., Hilbers, M. F., Buma, W. J., Feringa, B. L.

“…Synthetic molecular machines hold tremendous potential to revolutionize chemical and materials sciences. Their autonomous motion controlled by external stimuli…”
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Use of Density Functional Based Tight Binding Methods in Vibrational Circular Dichroism by Teodoro, T. Q, Koenis, M. A. J, Rüger, R, Galembeck, S. E, Buma, W. J, Nicu, V. P, Visscher, L

“…Vibrational circular dichroism (VCD) is a spectroscopic technique used to resolve the absolute configuration of chiral systems. Obtaining a theoretical VCD…”
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Frequency Range Selection Method for Vibrational Spectra by Teodoro, T. Q, Koenis, M. A. J, Galembeck, S. E, Nicu, V. P, Buma, W. J, Visscher, L

“…Theoretical calculations of vibrational properties are widely used to explain and predict experimental spectra. However, with standard quantum chemical methods…”
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Proton transfer with a twist? Femtosecond Dynamics of 7-(2-pyridyl)indole in Condensed Phase and in Supersonic Jets by Nosenko, Y, Wiosna-Sałyga, G, Kunitski, M, Petkova, I, Singh, A, Buma, W.J, Thummel, R.P, Brutschy, B, Waluk, J

“…Twist‐assisted proton transfer: Excited‐state intramolecular proton transfer (ESIPT) in 7‐(2‐pyridyl)indole proceeds in a barrierless fashion and is coupled…”
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Infrared Spectroscopy of Jet-cooled “GrandPAHs” in the 3–100 μm Region by Lemmens, A. K., Rijs, A. M., Buma, W. J.

“…Abstract Although large polycyclic aromatic hydrocarbons (PAHs) are likely to be responsible for IR emission of gaseous and dusty regions, their neutral…”
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Isolated Building Blocks of Photonic Materials:  High-Resolution Spectroscopy of Excited States of Jet-Cooled Push-Pull Stilbenes by Rijkenberg, R. A, Bebelaar, D, Buma, W. J, Hofstraat, J. W

“…The lowest excited singlet states of 4-(dimethylamino)-4‘-cyanostilbene (DCS), 4-(dimethylamino)-4‘-nitrostilbene (DANS), and…”
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Isolated Building Blocks of Photonic Materials:  High-Resolution Excited-State Photoelectron Spectroscopy of Jet-Cooled Tetramethylethylene and 1,1‘-Bicyclohexylidene by Rijkenberg, R. A, Buma, W. J, van Walree, C. A, Jenneskens, L. W

“…The spectroscopy and photophysics of tetramethylethylene and 1,1‘-bicyclohexylidene have been investigated using excited-state photoelectron spectroscopy in…”
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Self-trapped exciton state in Si nanocrystals revealed by induced absorption by de Boer, W. D. A. M., Timmerman, D., Gregorkiewicz, T., Zhang, H., Buma, W. J., Poddubny, A. N., Prokofiev, A. A., Yassievich, I. N.

“…We report results of time-resolved induced absorption (IA) spectroscopy on Si nanocrystals (Si NCs) embedded in a SiO sub(2) matrix. In line with theoretical…”
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Direct bandgap optical transitions in Si nanocrystals by Prokofiev, A. A., Moskalenko, A. S., Yassievich, I. N., de Boer, W. D. A. M., Timmerman, D., Zhang, H., Buma, W. J., Gregorkiewicz, T.

“…The effect of quantum confinement on the direct bandgap of spherical Si nanocrystals has been modelled theoretically. We conclude that the energy of the direct…”
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High-Resolution Excited-State Photoelectron Spectroscopy of the Lower Rydberg States of Jet-Cooled C2H4 and C2D4 by Rijkenberg, R. A, Buma, W. J

“…High-resolution (2+1) resonance-enhanced excited-state photoelectron spectroscopy on supersonic jet expansions of pure C2H4 and C2D4 has been employed to…”
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Two Ground State Conformers of the Proton Sponge 1,8-Bis(dimethylamino)naphthalene Revealed by Fluorescence Spectroscopy and ab Initio Calculations by Szemik-Hojniak, A, Zwier, J. M, Buma, W. J, Bursi, R, van der Waals, J. H

“…The S1 ↔ S0 transitions of the “proton sponge” 1,8-bis(dimethylamino)naphthalene have been studied by experiment and ab initio calculations. Fluorescence…”
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Photolysis-induced scrambling of PAHs as a mechanism for deuterium storage by Wiersma, S. D, Candian, A, Bakker, J. M, Berden, G, Oomens, J, Buma, W-J, Petrignani, A

“…Aim. We investigate the role of PAHs as a sink for deuterium in the interstellar medium and study UV photolysis as a potential process in the variations of the…”
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Anharmonicity in the mid-infrared spectra of polycyclic aromatic hydrocarbons: Molecular beam spectroscopy and calculations by Lemmens, A. K, Rap, D. B, Thunnissen, J. M. M, Mackie, C. J, Candian, A, Tielens, A. G. G. M, Rijs, A. M, Buma, W. J

“…Aims. In this work we determine the effects of anharmonicity on the mid-infrared spectra of the linear polycyclic aromatic hydrocarbons (PAHs) naphthalene,…”
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The asymmetric nature of charge transfer states of the cyano-substituted proton sponge by Szemik-Hojniak, A., Deperasińska, I., Buma, W.J., Balkowski, G., Pozharskii, A.F., Vistorobskii, N.V., Allonas, X.

“…The geometric and electronic structure of 1,8-bis(dimethylamino)-4-cyano-naphthalene (DMAN-CN) and its mono-protonated cation (H +DMAN-CN) have been…”
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Transient two-dimensional vibrational spectroscopy of an operating molecular machine by Panman, Matthijs R., van Dijk, Chris N., Huerta-Viga, Adriana, Sanders, Hans J., Bakker, Bert H., Leigh, David A., Brouwer, Albert M., Buma, Wybren Jan, Woutersen, Sander

“…Synthetic molecular machines are promising building blocks for future nanoscopic devices. However, the details of their mechanical behaviour are in many cases…”
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Structure and Photophysics of an Old, New Molecule:  1,3,6,8-Tetraazatricyclo[4.4.1.13,8]dodecane by Zwier, Jurriaan M, Brouwer, Albert M, Buma, Wybren Jan, Troisi, Alessandro, Zerbetto, Francesco

“…More than a century after its initial synthesis, the static and dynamic geometry of 1,3,6,8-tetraazatricyclo [4.4.1.13,8]dodecane (TTD), a fully saturated…”
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High-resolution IR absorption spectroscopy of polycyclic aromatic hydrocarbons in the 3 micron region: role of hydrogenation and alkylation by Maltseva, E, Mackie, C. J, Candian, A, Petrignani, A, Huang, X, Lee, T. J, Tielens, A. G. G. M, Oomens, J, Buma, WJ

“…Aims. We aim to elucidate the spectral changes in the 3 micron region that result from chemical changes in the molecular periphery of polycyclic aromatic…”
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Resonance enhanced multiphoton ionization photoelectron spectroscopy of gerade excited Rydberg states of the xenon dimer by Scheper, C.R., Buma, W.J., de Lange, C.A.

“…Resonance enhanced multiphoton ionization with high-resolution kinetic-energy-resolved electron detection and with zero-kinetic-energy electron detection…”
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Ab initio calculations on vibronic coupling in the lower triplet states of pyrimidine by Buma, W. J, Donckers, M. C. J. M, Groenen, E. J. J

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