High-reflectivity multilayer mirrors for a vacuum-ultraviolet interval of 35–50??nm

Uspenskii, Yu. A.; Levashov, V. E.; Виноградов, А. В.; Fedorenko, A. I.; Кондратенко, В. В.; Pershin, Yurii P.; Zubarev, E. N.; Fedotov, Vitalij

doi:10.1364/ol.23.000771

Cited by 88 publications

(58 citation statements)

References 5 publications

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“…The Z-fold mirror set consists of two 1 in. diameter Sc/ Si multilayer mirrors with about 40% reflectivity each; 41 a planar mirror, placed 30.5 cm from a f = 50 cm concave mirror, focuses the incoming laser beam to the ionization region of the TOFMS. The use of these optics improves the experimental setup in three ways: ͑1͒ the two mirrors allow full directional control of the ionizing 46.9 nm bright beam in order to improve alignment ͑motor controls for the mirrors are external to the vacuum system͒; ͑2͒ improved intensity of the light beam at the ion source region by using a focusing mirror for a tight focal spot; and ͑3͒ a tight focal spot that results in sharp ͑ca.…”

Section: ͑A͒mentioning

confidence: 99%

Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5eV soft x-ray laser

Dong

Heinbuch

Rocca

et al. 2006

The Journal of Chemical Physics

102

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A tabletop soft x-ray laser is applied for the first time as a high energy photon source for chemical dynamics experiments in the study of water, methanol, and ammonia clusters through time of flight mass spectroscopy. The 26.5 eV/photon laser ͑pulse time duration of ϳ1 ns͒ is employed as a single photon ionization source for the detection of these clusters. Only a small fraction of the photon energy is deposited in the cluster for metastable dissociation of cluster ions, and most of it is removed by the ejected electron. Protonated water, methanol, and ammonia clusters dominate the cluster mass spectra. Unprotonated ammonia clusters are observed in the protonated cluster ion size range 2 ഛ n ഛ 22. The unimolecular dissociation rate constants for reactions involving loss of one neutral molecule are calculated to be ͑0.6-2.7͒ ϫ 10 4 , ͑3.6-6.0͒ ϫ 10 3 , and ͑0.8-2.0͒ ϫ 10 4 s −1 for the protonated water ͑9 ഛ n ഛ 24͒, methanol ͑5 ഛ n ഛ 10͒, and ammonia ͑5 ഛ n ഛ 18͒ clusters, respectively. The temperatures of the neutral clusters are estimated to be between 40 and 200 K for water clusters ͑10ഛ n ഛ 21͒, and 50-100 K for methanol clusters ͑6 ഛ n ഛ 10͒. Products with losses of up to five H atoms are observed in the mass spectrum of the neutral ammonia dimer. Large ammonia clusters ͑NH 3 ͒ n ͑n Ͼ 3͒ do not lose more than three H atoms in the photoionization/ photodissociation process. For all three cluster systems studied, single photon ionization with a 26.5 eV photon yields near threshold ionization. The temperature of these three cluster systems increases with increasing cluster size over the above-indicated ranges.

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Section: ͑A͒mentioning

confidence: 99%

Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5eV soft x-ray laser

Dong

Heinbuch

Rocca

et al. 2006

The Journal of Chemical Physics

102

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“…A 200 nm thick Al filter (Luxel Corp.) blocked any residual infrared light from reaching the XUV interaction chamber. After separating the infrared from the XUV harmonics, we select and focus the 21 st harmonic using a spherical Sc/Si multilayer mirror designed to reflect light at 38 nm ± 5 nm with f/10 geometry at near normal incidence [15].…”

Section: Methodsmentioning

confidence: 99%

High Intensity Femtosecond XUV Pulse Interactions with Atomic Clusters

Hoffmann

Murphy

Keto³

et al. 2009

AIP Conference Proceedings

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Articles you may be interested inHigh-order harmonic generation during propagation of femtosecond pulses through the laserproduced plasmas of semiconductors J. Appl. Phys. 117, 023114 (2015) Abstract. The interactions of large xenon clusters irradiated by intense, femtosecond extremeultraviolet pulses at a wavelength of 38 nm have been studied. Using high harmonic generation from a 35 fs near-infrared terawatt laser, clusters have been irradiated by XUV pulses of 10 11 W/cm 2 intensity. Charge states up to Xe 8+ are observed, states well above that produced by single atom illumination, indicating that plasma continuum lowering is important. Furthermore the kinetic energy distribution of the exploding ions is consistent with a quasineutral hydrodynamic expansion, rather than a Coulomb explosion.

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“…Desétudes antérieures ont montré l'intérêt des multicouches Sc/Si pour ces longueurs d'onde et ont souligné les problèmes de stabilité thermique de ce type de structure [6][7][8]. Les deux solutions proposées dans la littérature pour améliorer cette stabilité est l'ajout de W [7] ou de Cr [8] aux deux interfaces Sc sur Si et Si sur Sc.…”

Section: Multicouchesà Base De Scandiumunclassified

Optiques multicouches pour l'extrême UV

et al. 2005

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Résumé. Nous présentons les principaux développements réalisés dernièrement en optique multicouches dans la gamme 30-50 nm. Autour de 30 nm, nous avons développé des multicouchesà bande passanteétroite dans le but de sélectionner une harmonique dans un spectre de sourceà génération d'harmonique d'ordré elevée. Dans cette même gamme spectrale, nous avonsétudié des structures périodiques,à trois matériaux par période, qui permettent d'augmenter de manière significative la réflectivité. Enfin, pour les longueur d'onde plus importante (autour de 45 nm) nous avonsétudié les performances et la stabilité de multicouches a base de scandium : Si/Sc et Si/X/Sc/X ou X représente une couche barrière.

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High-reflectivity multilayer mirrors for a vacuum-ultraviolet interval of 35–50??nm

Cited by 88 publications

References 5 publications

Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5eV soft x-ray laser

Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5eV soft x-ray laser

High Intensity Femtosecond XUV Pulse Interactions with Atomic Clusters

Optiques multicouches pour l'extrême UV

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