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Your search keyword '"Aseyev, S. A."' showing total 105 results
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105 results on '"Aseyev, S. A."'

16. Production and study of triply charged diatomic ions with femtosecond pulses: application to Cl(super +3)(sub 2)

Author

Verver, R.J., Matusek, D.R., Wright, J.S., Gibson, G.N., Bhardwaj, R., Ivanov, M.Yu., Corkum, P.B., Villeneuve, D.M., and Aseyev, S.

Subjects
Benzalkonium chloride -- Electric properties, Chlorides -- Electric properties, Vibrational spectra -- Research, Diatomic molecules -- Electric properties, Dichloropropane -- Electric properties, Ablation (Vaporization technology) -- Research, Chemicals, plastics and rubber industries
Abstract

The preparation of diatomic trications using intense femtosecond laser pulses is described. The feasibility of using femtosecond pump-probe techniques to measure the vibrational spectrum of Cl(super +3)(sub 2) is discussed. Optimization of the experimental parameters via the simulation suggests an improved approach to obtain the spectra of trications, with special emphasis on the unusual aspects of these systems.

Published
2001

17. Ultrafast desorption of molecular ions by XUV-photons, passing through dielectric hollow tip.

Author

Aseyev, S. A., Mironov, B. N., and Chekalin, S. V.

Subjects
*DESORPTION, *ORGANIC conductors, *CONDUCTING polymers, *IONS spectra, *LASER beams, *FEMTOSECOND lasers, *PHOTONS
Abstract

Pulsed desorption of organic conducting polymer by XUV-photons, formed by a thin capillary collimator, has been investigated. Short-wavelength radiation has been resulted from a metal target irradiated by a sharply focused Ti:Sa laser beam (0.8 μm, 40 fs, 3 mJ/pulse) and has been filtered by Mylar-gold substrate. Single shot and 1-kHz pulses regimes of driving femtosecond laser have been compared using a time-of-flight mass spectrometer. A stepwise function of photoion signal vs laser pulse energy has been observed. [ABSTRACT FROM AUTHOR]

Published
2013
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36. Strong fields molecular optics.

Author

Aseyev, S., Villeneuve, D. M., Dietrich, P., Ivanov, M., Spanner, M., and Corkum, P. B.

Subjects
*MOLECULES, *POLARIZABILITY (Electricity), *MOLECULAR beams
Abstract

Large non-resonant laser fields leads to a large, controllable AC Stark shift. Such shift can ensure a strong torque for molecules with anisotropic polarizability. Our experiment on alignment (angular trapping) of molecular axis is described. Molecules can be even spun to high angular momentum if a polarization of laser field rotates with increasing angular velocity in a controllable manner. The outlook on this future experiment is given in the manuscript. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000

49. Cloning of microstructures due to irradiation of thin gold foil by femtosecond laser radiation

Author

Mironov, B. N., Aseyev, S. A., and Chekalin, S. V.

Abstract

The analysis of the possibilities of microstructuring (micromachining) of various solids by sharply focused femtosecond laser (fsl) capable of providing for a high intensity for moderate pulse energies remains quite topical. Usually the process takes place immediately at the focal spot and an extended structure can only be formed by scanning the sample. In our experiments focusing fsl pulses into a vacuum setup we produced extended microstructures (microdamages) on a few tens nm thickness gold foil deposited onto a fused-quartz substrate. The structure length has been an order of magnitude larger than the typical size of the irradiated region. The detection of Au+photoions ensured a highly-sensitivite on-line diagnostics of this phenomenon and in the limit can be used for the probing of the picostructuring of solids irradiated by a laser. In the next step we are "cloning" the microstructure (microdamage) from one surface to another when there is a few tens microns vacuum-spacing between them and only one surface with a metal film is "directly" irradiated by fsl pulses. For the expertiment we prepared two similar fused-quartz prisms and pressed one sample to another. The clearance is determined by the thickness of a spacer (Cu-foil). The possible explanations are given.

Published
2010
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50. Production and Study of Triply Charged Diatomic Ions with Femtosecond Pulses:  Application to <EQUATION><EQNDATA>%@mt;sys@%%@bold@%Cl%@sx@%2%@be@%3+%@rsf@%%@sxx@%%@mx@%</EQNDATA> </EQUATION>

Author

Verver, R. J., Matusek, D. R., Wright, J. S., Gibson, G. N., Bhardwaj, R., Aseyev, S., Villeneuve, D. M., Corkum, P. B., and Ivanov, M. Yu.

Abstract

We describe the preparation of diatomic trications using intense femtosecond laser pulses, and discuss the feasibility of using femtoseond pump−probe techniques to measure the vibrational spectrum of %@mt;sys@%Cl%@sx@%2%@be@%3+%@sxx@%%@mx@% . Initial attempts to observe the vibrational spectra of %@mt;sys@%Cl%@sx@%2%@be@%3+%@sxx@%%@mx@% were unsuccessful. Possible refinements to the experiment are guided by calculations of the electronic states, transition moments, and field-dressed potential curves for %@mt;sys@%Cl%@sx@%2%@be@%3+%@sxx@%%@mx@% . Solution of the time-dependent Schrödinger equation using these theoretical data as input allow an accurate simulation of pump−probe experiments and their time-delay signals. Optimization of the experimental parameters via the simulation suggests an improved approach to obtaining the spectra of trications, with special emphasis on the unusual aspects of these systems.

Published
2001

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