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Saturday, April 18, 2020 | History

5 edition of Light induced drift found in the catalog.

Light induced drift

D. J. Biswas

Light induced drift

a possible mechanism of separation of isotopes by laser excitation

by D. J. Biswas

  • 330 Want to read
  • 26 Currently reading

Published by Bhabha Atomic Research Centre in Mumbai .
Written in English

    Subjects:
  • Isotope separation

  • Edition Notes

    Statementby D.J. Biswas, J.P. Nilaya, and N. Venkatramani.
    SeriesBARC external ;, BARC/2003/E/003
    ContributionsBhabha Atomic Research Centre.
    Classifications
    LC ClassificationsMicrofiche 2004/60095 (Q)
    The Physical Object
    FormatMicroform
    Paginationii, 31 p.
    Number of Pages31
    ID Numbers
    Open LibraryOL3336559M
    LC Control Number2004327066

    Light-sensitive proteins are powerful tools for interrogating biological phenomena because they can be manipulated with precise control in space and time generalizable approach for regulating the activity of a protein is to control its cellular localization 2, and others recently demonstrated that the photosensitive LOV2 domain from Avena sativa phototropin 1 (AsLOV2) can be used to Cited by: Electron-beam-induced current (EBIC) is a semiconductor analysis technique performed in a scanning electron microscope (SEM) or scanning transmission electron microscope (STEM). It is used to identify buried junctions or defects in semiconductors, or to examine minority carrier properties. EBIC is similar to cathodoluminescence in that it depends on the creation of electron–hole pairs in the.


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Light induced drift by D. J. Biswas Download PDF EPUB FB2

Part of the Astronomy and Astrophysics Library book series (AAL) Light induced drift (LID) is briefly described.

It is caused by outflowing photons but through an excitation process rather than through momentum exchange. Its efficiency is compared to that of atomic : Georges Michaud, Georges Alecian, Jacques Richer. Light Induced Kinetic Effects on Atoms, Ions, and Molecules: Proceedings of the Workshop, Held in Marciana Marina, Elba Island, Italy, MayHardcover – January 1, Format: Hardcover.

Books. Publishing Support. Login. Reset your password. If you have a user account, you will need to reset your password the next time you login. You will only need to do this once.

Find out more. IOPscience login / Sign Up. Please note:Cited by: 9. Light-induced drift (LID) has been suggested by Atutov and Shalagin () to be more efficient at causing abundances anomalies than radiation driven diffusion.

A formalism is developed Light induced drift book simplify the accurate evaluation of LID in by: Subject: Image Created Date: Using a new and sensitive technique, experiments on light-induced drift are performed on vibra- tionally excited CH3F in the buffer gases He, Ne, Ar, Kr, Xe, and CH3Cl.

For the noble buffer. Light-induced drift in semiconductor heterostructures: Microscopic theory. Sergey V. Faleev and Mark I. Stockman*. Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia ~Received 23 September.

This chapter discusses the concept of light-induced drift (LID), which is a mechanical effect of Light induced drift book at the interface of the kinetic theory and laser spectroscopy.

The basic principle of LID, explained in terms of a two-level model for the optical absorbers, is as by: Next chapter in book The Light Induced Drift (LID) is an effect proposed few years ago by Gel'mukhanov and Shalagin 1 and observed for the first time by Antsygin et al 2.

It is due to the combined actions of resonant laser excitation and collisions with a buffer : S. Gozzini, D. Zuppini, C. Gabbanini, L. Moi. We report direct quantitative measurements of the light-induced drift velocity in Na-noble-gas mixtures under well-defined conditions.

Results are in excellent agreement with predictions from a realistic numerical model incorporating the multilevel structure of the Na atom. The effect of optical hyperfine pumping on light-induced drift is investigated. Abstract. In a dilute mixture of optically absorbing atoms or molecules and a buffer gas the phenomenon of Light-Induced Drift (LID) can occur when: (i) the optically absorbing particles are excited in a velocity selective way (Doppler effect) and (ii) the collision rates with the buffer gas are different for particles in Light induced drift book ground- and excited-states, respectively [1], The velocity selective Author: E.

Eliel, H. Werij, A. Streater, J. Woerdman. Light-induced drift (LID) has been suggested by Atutov and Shalagin () to be more efficient at causing abundances anomalies than radiation driven diffusion.

A formalism is developed to. A rate equation model calculation is performed for the light induced drift, the magnitude of the effect is estimated for CH 3 F. An experiment with constant diffusion current and optoacoustic concentration measurement is described. Its result agrees qualitatively with the theoretical by: 5.

All the titanium dioxide layers showed no light-induced drift. After long-term measurement, the titanium dioxide layer annealed at °C revealed a better stability of the pH-sensing properties than other titanium dioxide layers investigated in this by: Mechanical action of light on the atoms has been extensively studied using different approaches: radiation pressure has been applied in atomic beam cooling; induced dipole force has been successfully used in collimating atomic beams and a new effect, Light-Induced Drift (LID), has been proposed and its effectiveness : J.

Xu, S. Gozzini, M. Allegrini, G. Alzetta, E. Mariotti, L. Moi. The influence of the bandwidth of the radiation source on light-induced drift (LID) of Na is studied experimentally. Broadband radiation can be used to eliminate optical hyperfine pumping on the one hand, and to provide more efficient excitation due to an increased velocity coverage, on the other hand.

These aspects are highlighted in two separate by: 5. Light-induced drift arises when optically excited atoms with a Doppler-selected velocity suffer a diffusive friction that is different from that of ground-state atoms.

When the atoms form an. Surface light-induced drift arises under velocity-selective excitation of a low-pressure gas if the accommodation coefficient α for tangential momentum transfer to the surface depends on the state of the gas particles.

A kinetic description of this effect is presented. Experiments were performed for rovibrationally excited CH 3 F colliding with a quartz surface at K. Light-induced drift (LID) of a rarefied gas in a cell with circular-cylindrical geometry is studied, and exact solutions to the model rate equations are obtained, with exact analytical solutions.

The Light Induced Drift effect was discovered theoretically in the Institute Automation and Electrometry on [1]. Soon after this amazing effect was demonstrated in the experiment [2]. It has been suggested that white light-induced drift might be a mechanism for the separation of species in chemically peculiar stars.

Light-induced drift velocities are calculated as a function of optical depth for two species of two level atoms in a gas mixture. Fraunhofer spectral lines form by radiative transfer as the light escapes from the optically-thick by: 2.

To realize light-induced dielectrophoretic manipulation of DNA, the setup shown in Fig. 1 was used. The device consists of two electrodes with an aqueous solution of DNA or polystyrene beads sandwiched in by: Abstract We present a model for light-induced drift (LID) in the Na-noble-gas system which should enable direct comparison with experiment.

In contrast to previous theories of LID based on a two-level description of the optical absorbers and on a simplified collision treatment, the present model is based on a realistic description of laser-driven Na atoms immersed in a buffer gas.

ADS Classic is now deprecated. It will be completely retired in October Please redirect your searches to the new ADS modern form or the classic info can be found on our blog.

Surface light-induced drift (SLID), which occurs under velocity-selective excitation due to the state-dependence of the probability of trapping or chemisorption, has demonstrated its extreme sensitivity in studying the state-specificity of gas-surface by: 4.

Abstract Using a new and sensitive technique, experiments on light-induced drift are performed on vibrationally excited CH 3 F in the buffer gases He, Ne, Ar, Kr, Xe, and CH 3 Cl.

For the noble buffer gases, the difference in collision frequency between ground- and excited-state CH 3 F with respect to the buffer-gas molecules is found to range from % for He to % for Xe. Surface light-induced drift (SLID) is known to give rise to an extremely sensitive method of studying the state-specificity of gas-surface interactions.

Burgess et al. found that 3 days of hours of continuous bright light in the morning phase advanced the DLMO by hours, while intermittent bright light (alternating h on and h off) induced a phase advance of h; the difference was not statistically significant.

26 In a different experimental paradigm, Gronfier et al. found that intermittent bright light pulses (15 min on, 60 min off over h) delayed. Downloadable (with restrictions). A kinetic theory is presented for the light-induced drift of molecules with degenerate energy levels that are immersed in a large excess of an atomic buffer gas and excited, in a velocity-selective way, by a weak, linearly polarized laser.

An iterative procedure is outlined for systematically solving the kinetic equation to obtain results, directly from the. It has been shown that the formation of the observed isotopic anomalies can be successfully explained by a diffusion mechanism called the light-induced drift (LID).

The observed ratios of isotopes also enable to estimate the evolutionary stages of CP stars. Drift, or dorifto as they call it Japan, extracts the most exciting portion from various forms of auto racing - the four-wheel drift - and makes it the focus of an extremely intense and visually intoxicating new motor sport.

How to Drift: The Art of Oversteer is a comprehensive guide to both driving technique and car setup. The author explains /5(17).

We found evidence for hydration effects by exploiting the effect of light. Incident light has a powerful effect on the size of the interfacial exclusion zone. In the presence of light, the exclusion zone grows substantially, easily by a factor of several times for a five-minute exposure to relatively weak light [5].Cited by: 7.

The processes of heat transfer and drift of rarefied gas in a capillary due to velocity-selective excitation of atoms by monochromatic light have been investigated. On the basis of kinetic equation the kinetic coefficients defining surface and bulk mechanisms of light induced transfer phenomena in dependence on the Knudsen number, the ratio of the rate of radiative decay of the Cited by: 2.

Self-powered behavior based on the light-induced self-poling effect in perovskite-based transport layer-free photodetectors† Tiqiang Pang, a Renxu Jia, * a Yucheng Wang, a Kai Sun, b Ziyang Hu, * b Yuejin Zhu, b Suzhen Luan a and Yuming Zhang a.

Light-induced drift: last issues Results are presented on the isotope separation of Rubidium, for the first time experimentally demonstrated upon saturated vapor conditions. A new manifestation of the light-induced drift, known as "white light induced drift", has been experimentally demonstrated by using a laser with a particular cavity.

A new manifestation of the light-induced drift, known as "white light induced drift", has been experimentally demonstrated by using a laser with a particular cavity configuration and special-spectral characteristics. Finally the production of vapor jets by light controlled diffusion is reported and its possible application : L.

Moi, S. Gozzini, Claudio Marinelli, S. Atutov, E. Mariotti, Alessandro Lucchesini, Mario Meucc. Light‐controlled deposition of potassium atoms onto a glass surface by light‐induced drift (LID) is demonstrated.

The collection of atoms by wave‐front curvature is found to be important for maximizing the deposition rate. The light control of diffusive deposition is demonstrated by using LID to push atoms away from surface regions where Cited by: 2.

Abstract The ortho-para nuclear spin conversion of CH 3 F molecules has been investigated. The spin modifications has been separated by the light induced drift effect.

The measured value of spin conversion rates, anomalously large isotopic effect and spin conversion rate pressure dependence has been considered in the framework of the model of spin conversion induced by the intramolecular.

LIGHT INDUCED DORMANCY IN BROMUS STERILIS Paperback – January 1, by F Pollard (Author) See all formats and editions Hide other formats and editions. Price New from Used from Pamphlet "Please retry" — Author: F Pollard. SPIE Digital Library Proceedings.

We present a general overview of the field of light-induced drift, specializing to the case of alkali-noble gas : J. Woerdrnan. A simple qualitative model, a generalization of the well-known Hamel model [6], suitable for any gas density ratio is constructed; a passage in the limit to the strong collision model is demonstrated.

Light-induced diffusion in a plane channel is examined within the framework of the model proposed for arbitrary Knudsen numbers and various gas density ratios; velocity profiles are obtained; Author: A.

É. Bazelyan.This book details the chemistry of visible light-induced photocatalysis using different classes of nanocomposites.

Starting with a general introduction and explanation of basic principles and mechanisms of (visible) light-induced photocatalysis in the first two chapters (not omitting a plaidoyer for furthering research and development in this promising field), the following chapters detail the Format: Hardcover.Outline 1 Chemically peculiar stars 2 Diffusion theory 3 Description of stellar plasma 4 Radiative acceleration 5 Stratification of chemical elements 6 Isotopic anomalies in CP stars 7 Light-induced drift 8 Evolutionary modelling of isotope separation 9 Conclusions Anna Aret (Tartu Observatory, Estonia) Diffusion and light-induced drift in stellar atmospheres.