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86 results on '"Woste L"'

1. Laser Filament Induced Water Condensation

Author

Kasparian J., Webe K., Vogel A., Petit Y., Lüder J., Hao Z.Q., Rohwetter P., Petrarca M., Stelmaszczyk K., Henin S., Wöste L., and Wolf J.-P.

Subjects
Physics, QC1-999
Abstract

At relative humidities above 70%, femtosecond laser filaments generate aerosol particles and water droplets in the atmosphere. The water vapour condensation and droplet stabilization are assured by soluble species produced in the laser plasma.

Published
2013
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2. Progress towards lightning control using lasers

Author

Kasparian Jérôme, Ackermann Roland, André Yves-Bernard, Méchain Grégoire, Méjean Guillaume, Prade Bernard, Rohwetter Philipp, Salmon Estelle, Stelmaszczyk Kamil, Yu Jin, Mysyrowicz André, Sauerbrey Roland, Wöste Ludger, and Wolf Jean-Pierre

Subjects
lightning, ultrashort laser, self-guiding, laser filaments, plasma, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

Lightning research needs on-demand lightning strikes, because of the random character of natural lightning. Lasers have been proposed as alternatives to the current technique using rocket-pulled wires, because they would expectedly provide more flexibility. However, high-energy, nanosecond lasers cannot provide long connected plasma channels. In contrast, we recently reported the triggering of electric events in thunderclouds using ultrashort laser pulses. Further improvements of the laser pulse sequence and experimental geometry are discussed.

Published
2008
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3. White-light filaments for atmospheric analysis. (Review)

Author

Kasparian, J., Rodriguez, M., Mejean, G., Yu, J., Wille, H., Bourayou, R., Frey, S., Andre, Y.-B., Mysyrowicz, A., Sauerbrey, R., Wolf, J.-P., and Woste, L.

Subjects
Science and technology
Abstract

Most long-path remote spectroscopic studies of the atmosphere rely on ambient light or narrow-band lasers. High-power femtosecond laser pulses have been found to propagate in the atmosphere as dynamically self-guided [...]

Published
2003

4. Trajectory Studies of Polar Stratospheric Cloud Lidar Observations at Sodankylä (Finland) During SESAME: Comparison with Box Model Results of Particle Evolution

Author

Rizi, V., Redaelli, G., Visconti, G., Masci, F., Wedekind, C., Stein, B., Immler, F., Mielke, B., Rairoux, P., Woste, L., Del Guasta, M., Morandi, M., Castagnoli, F., Balestri, S., Stefanutti, L., Matthey, R., Mitev, V., Douard, M., Wolf, J.P., Kyro, E., Rummukainen, M., and Kivi, R.

Published
1999
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5. Uptake dynamics and diffusion of HCI in sulfuric acid solution measured in single levitated microdroplets

Author

Schwell, M., Baumgartel, H., Weidinger, I., Kramer, B., Vortisch, H., Woste, L., Leisner, T., and Ruhl E.

Subjects
Sulfuric acid -- Chemical properties, Hydrochloric acid -- Chemical properties, Diffusion -- Analysis, Chemicals, plastics and rubber industries
Abstract

The uptake dynamics of HCI by single sulfuric acid microdroplets under stratospheric conditions is researched, the gas uptake of the droplets is monitored and the diffusion coefficients D(super liq) of HCI in supercooled sulfuric acid solutions are found to increase strongly with temperature and H20 concentration. A new method is proposed to deduce accommodation coefficients as a result of this experiment.

Published
2000

6. Femtosecond White-Light Lidar

Author

Frey, S, primary, Wolf, J, additional, Rodriguez, M, additional, Kasparian, J, additional, Wille, H, additional, Salmon, E, additional, Luderer, J, additional, Woste, L, additional, Bourayou, R, additional, Mejean, G, additional, and Yu, J, additional

Published
2005
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7. Laser-induced water condensation in air

Author

Rohwetter P, Kasparian J, Stelmaszczyk K, Hao ZQ, Henin S, Lascoux N, Nakaema WM, Petit Y, Queisser M, Salame R, Salmon E, Woste L, and Wolf JP

Abstract

Triggering rain on demand is an old dream of mankind with a huge potential socio economical benefit. To date efforts have mainly focused on cloud seeding using silver salt particles. We demonstrate that self guided ionized filaments generated by ultrashort laser pulses are also able to induce water cloud condensation in the free sub saturated atmosphere. Potential contributing mechanisms include photo oxidative chemistry and electrostatic effects. As well as revealing the potential for influencing or triggering water precipitation laser induced water condensation provides a new tool for the remote sensing of nucleation processes in clouds.

Published
2010

8. Homogeneous nucleation rates of supercooled water measured in single levitated microdroplets.

Author

Kramer, B., Hubner, O., Woste, L., Leisner, T., Schwell, M., Ruhl, E., and Baumgartel, H.

Subjects
NUCLEATION, LIGHT scattering
Abstract

Discusses the homogeneous nucleation rates of supercooled water measured in single levitated microdroplets. Analyzing the angle-resolved light scattering pattern of the droplets with classical Mie theory; Increase in the depolarization of the scattered light; Statistical analysis of the freezing process of individual droplets.

Published
1999

9. 1-J white-light continuum from 100-TW laser pulses

Author

Petit Y, Henin S, Nakaema WM, Bejot P, Jochmann A, Kraft SD, Bock S, Schramm U, Stelmaszczyk K, Rohwetter P, Kasparian J, Sauerbrey R, Woste L, and Wolf JP

Subjects
Physics::Optics
Abstract

We experimentally measured the supercontinuum generation using 3 J 30 fs laser pulses and measured white light generation at the level of 1 J. Such high energy is allowed by a strong contribution to the continuum by the photon bath as compared to the self guided filaments. This contribution due to the recently observed congestion of the filament number density in the beam profile at very high intensity also results in a wider broadening for positively chirped pulses rather than for negatively chirped ones similar to broadening in hollow core fibers.

Published
2011

12. Diffusion and aggregation of Agn-clusters (n=2-9) on HOPG probed by fs-two-photon-photoemission

Author

Busolt, U., Cottancin, E., Socaciu, L., Rohr, H., Leisner, T., Woste, L., and Publica

Subjects
highly oriented pyrolytic graphite, agn-clusters, hopg, photoelectrons kinetic energy distribution, atomic clusters, photoelectron spectra, 150 k, silver, ultrashort laser pulse pairs, magnetic bottle type time-of-flight spectrometer, graphite, 100 k, diffusion, kinetic energy, aggregation, ag, surface diffusion, metal clusters, quantum size effect, nanoparticles, 298 k, two-photon spectra, room temperature, plasmons, photoemission, photoelectron yield, time of flight spectra, fs-two-photon-photoemission
Abstract

The diffusion and aggregation of preformed Agn-clusters (n = 2-9) deposited onto a highly oriented pyrolytic graphite (HOPG) substrate is studied by two-photon-photoemission (2PPE). The sample is irradiated with ultrashort laser pulse pairs and the kinetic energy of the emitted photoelectrons is analyzed in a magnetic bottle type time-of-flight spectrometer. During annealing of the sample from 100 K up to room temperature, nanoparticles are formed on the surface by diffusion and aggregation of the silver clusters. A steep increase of the total photoelectron yield at a sample temperature of about 150 K is explained by the excitation of plasmons in the silver nanoparticles. From the kinetic energy distribution of the photoelectrons we deduce a strong. variation of the work function of the sample during the formation of the nanoparticles, which is attributed to a quantum size effect.

Published
2001

15. Gas phase vibrational spectroscopy of mass-selected vanadium oxide anions

Author

Santambrogio, G., Brummer, M., Woste, L., Dobler, J., Sierka, M., Sauer, J., Meijer, G.J.M., Asmis, K.R., Santambrogio, G., Brummer, M., Woste, L., Dobler, J., Sierka, M., Sauer, J., Meijer, G.J.M., and Asmis, K.R.

Abstract

Contains fulltext : 99133.pdf (publisher's version ) (Open Access)

Published
2008

17. Unexpected structures of aluminum oxide clusters in the gas phase

Author

Sierka, M., Dobler, J., Sauer, J., Santambrogio, G., Brummer, M., Woste, L., Janssens, E., Meijer, G.J.M., Asmis, K.R., Sierka, M., Dobler, J., Sauer, J., Santambrogio, G., Brummer, M., Woste, L., Janssens, E., Meijer, G.J.M., and Asmis, K.R.

Abstract

Contains fulltext : 98828.pdf (publisher's version ) (Closed access)

Published
2007

18. High-resolution spectroscopy and intramolecular dynamics

Author

Neusser, HJ, Neuhauser, R, Manz, J, Quack, M, Woste, L, Field, RW, Engel, V, Kobayashi, T, Yamanouchi, K, Softley, TP, and Child, MS

Subjects
chemistry.chemical_compound, chemistry, Chemical physics, Intramolecular force, Dynamics (mechanics), High resolution, Atomic physics, Benzene, Spectroscopy
Published
1997

21. Isomorphous substitution in bimetallic oxide clusters

Author

Janssens, E., Santambrogio, G., Brummer, M., Woste, L., Lievens, P., Sauer, J., Meijer, G.J.M., Asmis, K.R., Janssens, E., Santambrogio, G., Brummer, M., Woste, L., Lievens, P., Sauer, J., Meijer, G.J.M., and Asmis, K.R.

Abstract

Contains fulltext : 98840.pdf (publisher's version ) (Open Access)

Published
2006

24. Lidar observations of liquid and solid PSC at Sodankyla

Author

Wedekind, C., Immler, F., Mielke, B., Rairoux, P., Stein, B., Woste, L., Del, Guasta, Morandi, M., Stefanutti, M., Masci, L., Rizi, Vincenzo, Matthey, R., Mitev, V., Douard, M., Wolf, J. P., and Kyro, E.

Published
1995

28. Mass-selected infrared photodissociation spectroscopy of v4o10+

Author

Asmis, K.R., Brummer, M., Kaposta, C., Santambrogio, G., Helden, G.J. von, Meijer, G.J.M., Rademann, K., Woste, L., Asmis, K.R., Brummer, M., Kaposta, C., Santambrogio, G., Helden, G.J. von, Meijer, G.J.M., Rademann, K., and Woste, L.

Abstract

Contains fulltext : 98936.pdf (publisher's version ) (Open Access)

Published
2002

30. Megavolt discharges triggered and guided with laser filaments

Author

Yu, J., primary, Kasparian, J., additional, Salmon, E., additional, Wolf, J.-P., additional, Rodriguez, M., additional, Sauerbrey, R., additional, Wille, H., additional, Woste, L., additional, Fujii, T., additional, Andre, Y.-B., additional, Mysyrowicz, A., additional, Klingbeil, L., additional, Rethmeier, K., additional, and Kalkner, W., additional

Published
2003
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32. Laser cooling of trapped Ca+ by using an ultraviolet laser diode

Author

Miura, A., primary, Kawasaki, H., additional, Watanabe, M., additional, Urabe, S., additional, Kumagai, Hiroshi, additional, Asakawa, Yuichi, additional, Midorikawa, Katsumi, additional, Obara, Minoru, additional, Asahi, Hidehiko, additional, Ueda, Yoshinori, additional, Fujishima, D., additional, Suzuki, S., additional, Fujii, Y., additional, Otsuka, K., additional, Tanabe, T., additional, Mukai, Masayasu, additional, Matsuyama, Tetsuya, additional, Suzuki, Shinji, additional, Wada, Kenji, additional, Horinaka, Hiromichi, additional, Saka, Takashi, additional, Mori, Michiaki, additional, Shiraishi, T., additional, Takahashi, E., additional, Taki, S., additional, Kondo, K., additional, SHIMIZU, Takayuki, additional, NAKANO, Yoko, additional, MIYAZAKI, Kenzo, additional, NORMAND, Didier, additional, Minemoto, S., additional, Bartelt, A., additional, Kaposta, C., additional, Lupulescu, C., additional, Rosendo, P., additional, Vajda, S., additional, Woste, L., additional, Sakai, Hirofumi, additional, Larsen, Jakob Juul, additional, Safvan, C. P., additional, Ida, Wendt-Larsen, additional, Stapelfeldt, Henrik, additional, Kanai, Tsuneto, additional, Olesen, Johannes, additional, Corkum, Paul B., additional, Nishio, Ryosuke, additional, Awazu, Kunio, additional, Katayama, Seiji, additional, MAENO, Kazuo, additional, KASAI, Yuichi, additional, ENDO, Seiichi, additional, Akatsuka, H., additional, Kano, K., additional, Fujii, K., additional, Hayashi, T., additional, Sokabe, N., additional, Nukihara, K., additional, Izuhara, I., additional, Tanaka, J., additional, Miura, M., additional, Higuchi, Junichi, additional, Nishizawa, Norihiko, additional, Goto, Toshio, additional, Mori, Masakazu, additional, Yamane, Kazuo, additional, Sakata, S., additional, Kuwashima, F., additional, Kitazima, I., additional, Iwasawa, H., additional, Shimamura, Y., additional, Uchida, A., additional, Ogawa, T., additional, Shinozuka, M., additional, Yoshimori, S., additional, Mochida, H., additional, Shimizu, Y., additional, Itatani, J., additional, Toyoda, K., additional, Nagura, Chihiro, additional, Kawano, Hiroyuki, additional, Suda, Akira, additional, Koutaka, H., additional, Nishioka, H., additional, and Ueda, K., additional

Published
2001
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35. Light filaments generated by terawatt-laser pulses-conductivity, spectral content and LIDAR measurements

Author

Niedermeier, S., primary, Franco, M., additional, Kasparian, J., additional, Mondelain, D., additional, Mysyrowicz, A., additional, Prade, B., additional, Rairoux, P., additional, Rodriguez, M., additional, Ronneberger, F., additional, Sauerbrey, R., additional, Schillinger, H., additional, Tzortzakis, S., additional, Wille, H., additional, Wolf, J.-P, additional, Woste, L., additional, and Yu, J., additional

Published
2000
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41. The effect of infrared laser light on the formation of sulfur hexafluoride van der Waals clusters in a supersonic jet

Author

Rechsteiner, R., Monot, R., Woste, L., Zellweger, J. M., and Van den Bergh, H.

Subjects
in supersonic jet, sulfur hexafluoride cluster laser irradn, 2551-62-4P Role: PREP (Preparation) (formation of van der Waals clusters of, Physics::Atomic and Molecular Clusters, IR laser light effects on), mass spectra sulfur hexafluoride cluster
Abstract

A mol. beam mass spectrometer was constructed to study the formation of van der Waals clusters over a wide mass range. Using this app. (SF6)m was detected with 1 ? m ? 100 in the adiabatic expansion of SF6. By irradiating the SF6 jet with a continuous-wave IR laser beam in the collisional region of the expansion with power densities as low as .apprx.100 W cm-2, cluster formation can be essentially completely inhibited due to a shift in the \"equil.\" (SF6)m + SF6 = (SF6)m-1 towards the reactants, caused by the laser-induced excitation of the SF6 monomers. Irradiating the mol. beam downstream in the collision free region induces a smaller decrease in the cluster concns. The latter effect is interpreted as being due to single quantum IR induced predissocn. of the weakly bound van der Waals mols. The power d. and wavelength dependence of these effects are reported and discussed.

42. Results of a trajectory box model simulating the size distribution evolution of stratospheric particles (H2SO4/H2O and H2SO4/HNO3/H2O solutions). A case study during SESAME

Author

Pyle, A., Harris, N.R.P., Amanatidis, G.T., Rizi, V.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Redaelli, G.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Visconti, G.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Masci, F.; ING, Italy, Ivanova, I.; Bulgarian Academy of Science, Bulgaria, Weedekind, C.; Freie Universitat Berlin, Germany, Immler, F.; Freie Universitat Berlin, Germany, Mielke, B.; Freie Universitat Berlin, Germany, Rairoux, P.; Freie Universitat Berlin, Germany, Stein, B.; Freie Universitat Berlin, Germany, Woste, L.; Freie Universitat Berlin, Germany, Matthey, R.; Observatorie Cantonal Neuchatel, Swizerland, Mitev, V.; Observatorie Cantonal Neuchatel, Swizerland, Douard, M.; Universitè, Lyon, Wolf, J.P.; Universiẗ, Lyon, Kyro, E.; FMI, Sodankyla, Finland, Kivi, R.; FMI, Sodankyla, Finland, Pyle, A., Harris, N.R.P., Amanatidis, G.T., Rizi, V.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Redaelli, G.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Visconti, G.; Dipartimeto di Fisica, Università di L'Aquila, Italy, Masci, F.; ING, Italy, Ivanova, I.; Bulgarian Academy of Science, Bulgaria, Weedekind, C.; Freie Universitat Berlin, Germany, Immler, F.; Freie Universitat Berlin, Germany, Mielke, B.; Freie Universitat Berlin, Germany, Rairoux, P.; Freie Universitat Berlin, Germany, Stein, B.; Freie Universitat Berlin, Germany, Woste, L.; Freie Universitat Berlin, Germany, Matthey, R.; Observatorie Cantonal Neuchatel, Swizerland, Mitev, V.; Observatorie Cantonal Neuchatel, Swizerland, Douard, M.; Universitè, Lyon, Wolf, J.P.; Universiẗ, Lyon, Kyro, E.; FMI, Sodankyla, Finland, and Kivi, R.; FMI, Sodankyla, Finland

Abstract

A revised interpretation of ER-2 polar stratospheric cloud (PSC) observations during AASE I (1989) and MOE (1987) Tabazadeh et al., 1995) suggests a picture of the PSC formations which evidences the importance of the air mass thermal histories. A series of ER-2 measurements are consistent with the thermodynamical properties of the liquid H2SO4/HNO3/H20 solution particles, but the data collected in other flights are in agreement with the possible formation of amorphous solid solutions of HNO3 and H2O through a peculiar coolingiheating cycle below the solid sulfuric acid tetrahydrate (SAT) melting temperatures and above the water ice saturation temperatures (frost point). During this cycle the liquid H2SO4 stratospheric aerosols may undergo a phase transition to SAT particles, required for the growing of solid nitric acid hydrates. On the other hand Koop et al., (1995) report laboratory experiments which show that H2SO4/HNO3/H20 liquid particles never freeze under stratospheric conditions for temperatures higher than the frost point. despite the change in composition due to the HNO3 uptake when cooling. In addition, when solid particles are heated, they start to become liquid at the SAT melting point. Then the analysis of any PSC data should start from air mass trajectory studies, and some thermodynamical criteria could be used to infer the physical state (liquid or solid) of the sampled particles. We use a trajectory box model to study the microphysical properties of stratospheric clouds observed during SESAME by the MOANA (Measurements and modelling of Ozone and Aerosols in the Northern Atmosphere) lidar at Sodankyla (SF). Our models treats the gas to particle conversion of H2SO4, HNO3, H2O and the microphysics of Aitken particles (ATK), H2SO4/H20 (WS) and H2SO4/HNO3/H20 (WSN) solution droplets; H2SO4 -nH2O (SA) and HNO3 -nH20 (NA) solid hydrates particles are also taken into account. To analyze the MOANA observations, within a prescribed air mass thermal history, w

43. 33-W CW dye laser

Author

Anliker, P., primary, Luthi, H., additional, Seelig, W., additional, Steinger, J., additional, Weber, H., additional, Leutwyler, S., additional, Schumacher, E., additional, and Woste, L., additional

Published
1977
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46. Characterization and optimization of infrared emission from light filaments observed in a fs-TW laser beam propagating in the atmosphere

Author

Yu, J., primary, Franco, M., additional, Kasparian, J., additional, Mondelain, D., additional, Mysyrowicz, A., additional, Niedermeier, S., additional, Prade, B., additional, Rodriguez, M., additional, Sauerbrey, R., additional, Tzortzakis, S., additional, Wille, H., additional, Wolf, J.-P., additional, and Woste, L., additional

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48. Observation of Predissociated Excited States in Mixed Alkali Trimer Clusters Na<INF>2</INF>K and K<INF>2</INF>Na:  Time-Resolved Spectroscopy of Bound−Free Transitions

Author

Vajda, S., Rutz, S., Heufelder, J., Rosendo, P., Ruppe, H., Wetzel, P., and Woste, L.

Abstract

For the first time, predissociated excited electronic states of mixed alkali trimers exhibiting vibrational structure in their time-resolved spectra were found. The one-color femtosecond pump and probe technique was employed to study the predissociated excited electronic states of Na2K trimer located between 730 and 790 nm. States were populated with one photon of the probe pulse. Dynamics was monitored by ionization of the excited trimer with two photons of the probe pulse. In the case of Na2K, excitation wavelength-dependent dissociation times between 2.5 and 6 ps were obtained. The ion signal of Na2K+ recorded at 770 nm revealed an oscillatory structure with a dominant period of 490 fs, while the transient spectrum of the NaK fragments exhibited oscillations with an estimated period of 440 fs, characteristic for the wave packet dynamics in the NaK A1Σ+ state. In the case of K2Na, no wave packet dynamics was resolved for the trimer's short-living predissociated excited state (τ &lt; 5 ps) populated at 735 nm.

Published
1998

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