Peer-reviewed Publications |
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Atabek, O., Lefebvre, R., Lepers, M., Jaouadi, A., Dulieu, O., & Kokoouline, V. (2011). Proposal for a Laser Control of Vibrational Cooling in $\mathrmNa_2$ Using Resonance Coalescence. PHYSICAL REVIEW LETTERS, 106(17), 173002.
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Bizau, J. M., Blancard, C., Coreno, M., Cubaynes, D., Dehon, C., El Hassan, N., Folkmann, F., Gharaibeh, M. F., Giuliani, A., Lemaire, J., Milosavljevic, A. R., Nicolas, C., & Thissen, R. (2011). Photoionization study of Kr+ and Xe+ ions with the combined use of a merged-beam set-up and an ion trap. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 44(5), 055205.
Résumé: Photoionization cross sections of halogen-like Kr+ and Xe+ ions have been measured in the photon energy range extending up to 15 eV above the threshold. Two different devices were used, a merged-beam set-up and an ion trap. Combination of the two techniques allows for the extraction of the pure ground state ionization cross section on an absolute scale. Multiconfiguration Dirac-Fock calculations reproduce the magnitude of the direct photoionization cross sections well.
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Casagrande, E. M. S., Li, C., Lahmam-Bennani, A., Dal Cappello, C., Schulz, M., & Ciappina, M. (2011). Experimental and theoretical confirmation of the role of higher order mechanisms in the electron impact double ionization of helium. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 44(5), 055201.
Résumé: Our recent measurements (Lahmam-Bennani et al 2010 J. Phys. B: At. Mol. Opt. Phys. 43 105201) of the (e,3-1e) four-fold differential cross sections (4DCS) for double ionization (DI) of helium are extended here to a wider range of ejected electron energies and very asymmetric energy sharing. Previous observations of large angular shifts in the experimental 4DCS distributions with respect to the momentum transfer axis are once again reproduced by the new measured data. Moreover, a comparison of all the data sets with the kinematical analysis previously given and with two newly developed non-first-order theoretical models for DI-namely the two-step 2-Monte Carlo event generator (TS2-MCEG) and a second Born approximation (B2)-confirms our interpretation which allows the observed shifts and the existence of structures in the intensity distributions to be mostly related to the second order, TS2 DI mechanism, which is shown to predominate over the first-order 'shake-off' (SO) and 'two-step 1' (TS1) mechanisms under the present kinematics.
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Duesterer, S., Radcliffe, P., Bostedt, C., Bozek, J., Cavalieri, A. L., Coffee, R., Costello, J. T., Cubaynes, D., DiMauro, L. F., Ding, Y., Doumy, G., Gruener, F., Helml, W., Schweinberger, W., Kienberger, R., Maier, A. R., Messerschmidt, M., Richardson, V., Roedig, C., Tschentscher, T., & Meyer, M. (2011). Femtosecond x-ray pulse length characterization at the Linac Coherent Light Source free-electron laser. NEW JOURNAL OF PHYSICS, 13.
Résumé: Two-color, single-shot time-of-flight electron spectroscopy of atomic neon was employed at the Linac Coherent Light Source (LCLS) to measure laser-assisted Auger decay in the x-ray regime. This x-ray-optical cross-correlation technique provides a straightforward, non-invasive and on-line means of determining the duration of femtosecond (>40 fs) x-ray pulses. In combination with a theoretical model of the process based on the soft-photon approximation, we were able to obtain the LCLS pulse duration and to extract a mean value of the temporal jitter between the optical pulses from a synchronized Ti-sapphire laser and x-ray pulses from the LCLS. We find that the experimentally determined values are systematically smaller than the length of the electron bunches. Nominal electron pulse durations of 175 and 75 fs, as provided by the LCLS control system, yield x-ray pulse shapes of 120 +/- 20 fs full-width at half-maximum (FWHM) and an upper limit of 40 +/- 20 fs FWHM, respectively. Simulations of the free-electron laser agree well with the experimental results.
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Gharaibeh, M. F., Bizau, J. M., Cubaynes, D., Guilbaud, S., El Hassan, N., Al Shorman, M. M., Miron, C., Nicolas, C., Robert, E., Blancard, C., & McLaughlin, B. M. (2011). K-shell photoionization of singly ionized atomic nitrogen: experiment and theory. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 44(17), 175208.
Résumé: Absolute cross sections for the K-shell photoionization of C-like nitrogen ions were measured by employing the ion-photon merged-beam technique at the SOLEIL synchrotron radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/Delta E approximate to 7000 was achieved with the photon energy from 388 to 430 eV scanned with a band pass of 300 meV, and the 399.4-402 eV range with 60 meV. Experimental results are compared with theoretical predictions made from the multi-configuration Dirac-Fock and R-matrix methods. The interplay between experiment and theory enabled the identification and characterization of the strong 1s -> 2p resonances observed in the spectra.
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Jaouadi, A., Telmini, M., & Charron, E. (2011). Bose-Einstein condensation with a finite number of particles in a power-law trap. PHYSICAL REVIEW A, 83, 023616.
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Lefebvre, R., & Atabek, O. (2011). Zero-width resonances and exceptional points in molecular photodissociation. International Journal of Quantum Chemistry, 111, 272.
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Lefebvre, R., Jaouadi, A., Dulieu, O., & Atabek, O. (2011). Laser cooling of the vibrational motion of Na$_2$ combining the effects of zero-width resonances and exceptional points. PHYSICAL REVIEW A, 84(4), 043428.
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Li, C., Lahmam-Bennani, A., Casagrande, E. M. S., & Dal Cappello, C. (2011). Electron impact double ionization of neon, argon and molecular nitrogen: role of the two-step mechanism. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 44(11), 115201.
Résumé: Recent measurements of the (e, 3-1e) fourfold differential cross sections for the double ionization of helium are here extended to more complex targets, namely neon, argon and molecular nitrogen. The previous observations of large angular shifts in the experimental fourfold differential cross section (4DCS) distributions with respect to the momentum transfer axis and the existence of structures in these distributions are found to similarly hold here. For the three investigated targets, the experimental data are compared with the kinematical analysis previously given to describe the second-order, 'two-step 2' (TS2) double ionization (DI) mechanism. Such a comparison confirms our interpretation which allows the observed shifts and structures in the intensity distributions to be mostly related to the 'two-step 2' mechanism, which is shown to predominate over the first-order 'shake-off' (SO) and 'two-step 1' (TS1) mechanisms under the present kinematics. The experimental data are also compared to the predictions of a first Born and second Born model, showing rather mixed agreement.
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Meng, L. M., Alessi, D., Guilbaud, O., Wang, Y., Berrill, M., Luther, B. M., Domingue, S. R., Martz, D. H., Joyeux, D., De Rossi, S., Rocca, J. J., & Klisnick, A. (2011). Temporal coherence and spectral linewidth of an injection-seeded transient collisional soft x-ray laser. OPTICS EXPRESS, 19(13), 12087–12092.
Résumé: The temporal coherence of an injection-seeded transient 18.9 nm molybdenum soft x-ray laser was measured using a wavefront division interferometer and compared to model simulations. The seeded laser is found to have a coherence time similar to that of the unseeded amplifier, similar to 1ps, but a significantly larger degree of temporal coherence. The measured coherence time for the unseeded amplifier is only a small fraction of the pulsewidth, while in the case of the seeded laser it approaches full temporal coherence. The measurements confirm that the bandwidth of the solid target amplifiers is significantly wider than that of soft x-ray lasers that use gaseous targets, an advantage for the development of sub-picosecond soft x-ray lasers. (C) 2011 Optical Society of America
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Meyer, M., Grum-Grzhimailo, A. N., Cubaynes, D., Felfli, Z., Heinecke, E., Manson, S. T., & Zimmermann, P. (2011). Magnetic Dichroism in K-Shell Photoemission from Laser Excited Li Atoms. PHYSICAL REVIEW LETTERS, 107(21), 213001.
Résumé: Magnetic dichroism in the angular distribution has been demonstrated for single-electron photoemission from inner ns(2) subshells of gaseous atomic targets using the example of K-shell photoionization of polarized Li atoms laser prepared in the 1s(2)2p (2)P(3/2) excited state. The effect is pronounced for the conjugate shakeup and conjugate shakedown photoelectron lines, and less important, though observable, for the main and direct shakeup lines. The phenomenon is caused by configuration interaction in the final continuum state and is quantitatively described by the close-coupling R-matrix calculations.
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Milosavljevic, A. R., Nicolas, C., Lemaire, J., Dehon, C., Thissen, R., Bizau, J. - M., Refregiers, M., Nahon, L., & Giuliani, A. (2011). Photoionization of a protein isolated in vacuo. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 13(34), 15432–15436.
Résumé: Gas phase VUV single-photon photoionization spectroscopy of electrospray-produced multiply protonated cytochrome c protein ( 12 kDa) has been performed by means of coupling a linear quadrupole ion trap with a synchrotron beamline. The thresholds for the ionization of the 8+ and 11+ charge state precursors to radical 9+ and 12+ species were measured to be 12.75 +/- 0.10 and 13.51 +/- 0.10 eV, respectively.
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Peters, M., Nguyen-Dang, T. T., & Atabek, O. (2011). Intense laser-induced molecular processes: From imaging to control. Physical and Chemical News, 57(1), 1.
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Peters, M., Nguyen-Dang, T. T., Cornaggia, C., Saugout, S., Charron, E., Keller, A., & Atabek, O. (2011). Ultrafast molecular imaging by laser-induced electron diffraction. PHYSICAL REVIEW A, 83, 051403.
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Ros, D., Cassou, K., Cros, B., Daboussi, S., Demailly, J., Guilbaud, A., Kazamias, S., Lagron, J. - C., Maynard, G., Neveu, O., Pittman, M., Zielbauer, B., Zimmer, D., Kuhl, T., Lacombe, S., Porcel, E., du Penhoat, M. - A., Zeitoun, P., & Mourou, G. (2011). LASERIX: An open facility for developments of EUV and soft X-ray lasers and applications-Developments of XUV sources using high power laser facilities: ILE, ELI. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 653(1), 76–79.
Résumé: LASERIX is a high-power laser facility leading to High-repetition-rate XUV laser pumped by Titanium:Sapphire laser. The aim of this laser facility is to offer Soft XRLs in the 30-7 nm range and auxiliary IR beam, which could also be used to produce synchronized XUV sources. In this contribution, the main results concerning both the development of XUV sources and their use for applications (irradiation of DNA samples) are presented, as well the present status and some perspectives for LASERIX. (C) 2011 Elsevier B.V. All rights reserved.
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Siu, W., Kelkensberg, F., Gademann, G., Rouzee, A., Johnsson, P., Dowek, D., Lucchini, M., Calegari, F., De Giovannini, U., Rubio, A., Lucchese, R. R., Kono, H., Lepine, F., & Vrakking, M. J. J. (2011). Attosecond control of dissociative ionization of O-2 molecules. PHYSICAL REVIEW A, 84(6), 063412.
Résumé: We demonstrate that dissociative ionization of O-2 can be controlled by the relative delay between an attosecond pulse train (APT) and a copropagating infrared (IR) field. Our experiments reveal a dependence of both the branching ratios between a range of electronic states and the fragment angular distributions on the extreme ultraviolet (XUV) to IR time delay. The observations go beyond adiabatic propagation of dissociative wave packets on IR-induced quasistatic potential energy curves and are understood in terms of an IR-induced coupling between electronic states in the molecular ion.
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Actes de Conférences |
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A. Klisnick, O. G., J-P Goddet, et al. (2011). Temporal Coherence and Spectral Linewidth of seeded and ASE XUV lasers. In X-RAY LASERS 2010 (Vol. 136, pp. 101–110). Springer.
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Alessi, D., Meng, L. M., Wang, Y., Guilbaud, O., Berrill, M., Domingue, S. R., Martz, D. H., Luther, B. M., Joyeux, D., De Rossi, S., Klisnick, A., & Rocca, J. J. (2011). Spectral Linewidth Measurement of an Injection-Seeded Transient 18.9 nm Soft X-Ray Laser. In 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). IEEE.
Résumé: The linewidth of an injection-seeded 18.9nm molybdenum soft x-ray laser (SXRL) was measured to be significantly wider than seeded optical field ionization SXRLs that use gaseous targets, an advantage for the development of sub-picosecond SXRLs.
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Klisnick, A., Meng, L. M., Alessi, D., Guilbaud, O., Wang, Y., Berrill, M., Luther, B., Calisti, A., Benredjem, D., Ferri, S., Mosse, C., de Rossi, S., Joyeux, D., & Rocca, J. J. (2011). Spectral width of seeded and ASE XUV lasers: experiment and numerical simulations. In X-RAY LASERS AND COHERENT X-RAY SOURCES: DEVELOPMENT AND APPLICATIONS IX (Vol. 8140, 814006). 8140.
Résumé: We describe our recent progress in the investigation of the spectral properties of collisional XUV lasers, including both experimental measurements and numerical calculations. Using a wavefront-division, variable path-difference interferometer, we have characterized the temporal coherence and the spectral width of an injection-seeded transient XUV laser emitted at 18.9 nm from a Ni-like Mo plasma. Our results show that the temporal coherence of the beam is significantly increased by the injection-seeded operation, compared to the standard ASE mode, in agreement with detailed numerical simulations. Using the PPP code we have calculated the intrinsic linewidth of the same lasing line over a range of electron density and at temperatures that are relevant to transient collisional pumping. We discuss the relative contributions of homogeneous and inhomogeneous broadening to the overall profile.
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Lahmam-Bennani, A., Casagrande, E. M. S., & Li, C. (2011). Electron impact double ionization of rare gases: A kinematical analysis of the non-first order effects at intermediate impact energy. In INTERNATIONAL CONFERENCE ON MANY PARTICLE SPECTROSCOPY OF ATOMS (Vol. 288).
Résumé: The (e,3-1e) four-fold differential cross sections (4DCS) are measured for the electron impact double ionization of rare gas atoms (He, Ne, Ar) in coplanar asymmetric geometry for a wide range of ejected electron energies (5 to 144 eV) and at an incident energy of about 600 – 700 eV. Though we only show here a sample of the results, all experimental angular distributions of the 4DCS are characterized by large angular shifts of the forward and backward lobes with respect to the momentum transfer direction or its opposite, respectively. This validates our previously published results [Lahmam-Bennani et al 2002 J. Phys. B: At. Mol. Opt. Phys. 35 L59] which were questioned by Gotz et al [2003 J. Phys. B: At. MoL Opt. Phys. 36 L77]. A qualitative, kinematical analysis is given which allows relating these shifts and the observed structures (or sub-lobes) in the cross section distributions to the second order, 'two-step 2' double ionization mechanism, which is shown to predominate over the first-order 'shake-off' and 'two-step l' mechanisms under the present kinematics.
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Meng, L., Bourgaux, A. - C., Bastiani-Ceccotti, S., Guilbaud, O., Pittman, M., Kazamias, S., Cassou, K., Daboussi, S., Ros, D., & Klisnick, A. (2011). Characterization of the temporal duration of the XUV laser pulse at the LASERIX facility. In X-RAY LASERS AND COHERENT X-RAY SOURCES: DEVELOPMENT AND APPLICATIONS IX (Vol. 8140, 81401A). 8140.
Résumé: We report recent experimental measurements of the duration of a Ni-like Mo transient XUV laser emitted at 18.9 nm and generated under GRIP geometry at the LASERIX facility. These measurements have been performed using an ultra-fast X-ray streak camera (AXIS Photonique). A new trigger line was implemented, yielding a shot-to-shot jitter of less than 10 ps. The KBr photocathode of the streak camera was positioned close to the plane of the magnified near-field image of the XUV laser emitting aperture. Saturation in the streak camera was avoided by carefully adjusting the signal level of the focused image. The sweep speed was calibrated in-situ by generating a double-pulse XUV laser. Finally the temporal resolution of the instrument was measured directly with a femtosecond, high-order harmonic pulse. XUV laser pulse durations as short as 2.8 ps were measured for a 20 degrees GRIP angle and a 0.75 ps GRIP pulse duration. We present and discuss our study of the effect of these two parameters on the measured pulse duration.
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Ros, D., & Cassou K, C. B., et al. (2011). LASERIX : an open facility for developments of EUV and soft X-ray lasers and applications. In X-RAY LASERS 2010 (Vol. 136, pp. 39–46). Springer.
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Ros, D., Guilbaud, O., Kazamias, S., Pittman, M., Cassou, K., Daboussi, S., Neveu, O., Demailly, J., Cros, B., Maynard, G., Zielbauer, B., Zimmer, D., Kuehl, T., Lacombe, S., Klisnick, A., Bastiani-Ceccoti, S., Tallents, G. J., Wagenaars, E., Wilson, L., & Zeitoun, P. (2011). Stable and long-time operation of a soft X-ray laser for user applications experiments. In X-RAY LASERS AND COHERENT X-RAY SOURCES: DEVELOPMENT AND APPLICATIONS IX (Vol. 8140, 81400E). Proceedings of SPIE, 8140.
Résumé: LASERIX is a high-power laser facility leading to High-repetition-rate XUV laser pumped by Titanium: Sapphire laser. The aim of this laser facility is to offer Soft XRLs in the 30-7 nm range and auxiliary IR beam that could also be used to produce synchronized XUV sources. This experimental configuration highly enhances the scientific opportunities of the facility, giving thus the opportunity to realize both X-ray laser experiments and more generally pump/probe experiments, mixing IR and XUV sources. In this contribution, the main results concerning both the development of XUV sources(X-Ray lasers and HHG sources) and their use for applications are presented.
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S. Sebban, F. T., J-P Goddet, O. Guilabud, et al. (2011). Characterization of a Seeded Optical-Field Ionized Collisional Soft X-Ray Laser. In X-RAY LASERS 2010 (Vol. 136, pp. 127–136). Springer.
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Sebban, S., Tissandier, F., Gautier, J., Kozlova, M., Goddet, J. P., Guilbaud, O., Zeitoun, P., Ribiere, M., Jacquemot, S., Lambert, G., Maynard, G., Robillard, B., Klisnick, A., Mocek, T., & Nejdl, J. (2011). Advances in laser driven soft x-ray lasers at LOA. In X-RAY LASERS AND COHERENT X-RAY SOURCES: DEVELOPMENT AND APPLICATIONS IX (Vol. 8140, 814005). Proceedings of SPIE, 8140.
Résumé: We report spatial and spectral characterization an optical-field-ionized high-order harmonic-seeded soft-x-ray laser. We show that it can be controlled between a regular Gaussian shape and a Bessel profile exhibiting several rings via the IR laser pump intensity. The temporal coherence and spectral linewidth of both the seeded and unseeded soft-x-ray lasers were experimentally measured using a varying path difference interferometer. It showed that the high-order harmonic is subject to a strong spectral narrowing during its propagation in the plasma amplifier without rebroadening at saturation. Also, we present a new method to generate ultra-short x-ray laser pulses by using the laser-driven betatron source to photo-pump inner-shell transitions.
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Urbanski, L., Meng, L. M., Marconi, M. C., Berrill, M., Guilbaud, O., Klisnick, A., & Rocca, J. J. (2011). Line width measurement of a capillary discharge soft X-ray laser. In X-RAY LASERS AND COHERENT X-RAY SOURCES: DEVELOPMENT AND APPLICATIONS IX (Vol. 8140, 81400Y). Proceedings of SPIE, 8140.
Résumé: We measured the linewidth of a lambda = 46.9 nm neon-like argon capillary discharge soft x-ray laser. A wavefront division interferometer based on a pair of dihedrons was used to resolve the laser line measuring the variation in the interference fringe visibility for different optical path differences. We measured a relative linewidths of Delta lambda/lambda = 3-4 10(-5). No significant re-broadening was observed when the length of the laser medium was increased beyond the saturation length due to effects that homogenizes the line profile.
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