Spectra and angular distributions of electrons emitted from laser-produced plasmas

Giovanielli, D. V.; Kephart, J. F.; Williams, A. H.

doi:10.1063/1.323070

Cited by 41 publications

(9 citation statements)

References 6 publications

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“…Suprathermal electrons have been previously observed in laser fusion studies, [12][13][14][15] where the laser intensities used are similar to those generated by the femtosecond pulses in our experiment. These suprathermal or sometimes termed ''fast electrons'' are characterized by a temperature that is on the order of 10-20 times higher than that of the background plasma temperature and scales as (I 2 ) a T b , where a and b generally have values between 0.25 and 0.50 and I is the laser intensity, is the laser wavelength, and T is the background plasma temperature.…”

Section: A Tof Measurementssupporting

confidence: 77%

High intensity femtosecond laser deposition of diamond-like carbon thin films

Qian

Crăciun

Singh

et al. 1999

Journal of Applied Physics

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Hydrogen-free diamond-like carbon ͑DLC͒ films have been deposited with a 100 fs ͑FWHM͒ Ti:sapphire laser beam at intensities I in the 10 14-10 15 W/cm 2 range. The films were studied with scanning probe microscopy, variable angle spectroscopic ellipsometry, Raman spectroscopy, and electron energy loss spectroscopy. DLC films with good scratch resistance, excellent chemical inertness, and high optical transparency in the visible and near infrared range were deposited at room temperature. As the laser intensity was increased from 3ϫ10 14 to 6ϫ10 15 W/cm 2 , the films showed an increased surface particle density, a decreased optical transparency (85%˜60%), and Tauc band gap (1.4˜0.8 eV), as well as a lower sp 3 content (60%˜50%). The time-of-flight spectra recorded from the laser plume exhibited a double-peak distribution, with a high energy suprathermal ion peak preceding a slower thermal component. The most probable ion kinetic energy showed an I 0.55 dependence, increasing from 300 to 2000 eV, when the laser intensity was varied from 3ϫ10 14 to 6ϫ10 15 W/cm 2 , while the kinetic energy of suprathermal ions increased from 3 to over 20 keV and showed an I 0.33 dependence. These high energy ions are believed to have originated from an electrostatic acceleration field established by suprathermal electrons which were formed by resonant absorption of the intense laser beams.

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Section: A Tof Measurementssupporting

confidence: 77%

High intensity femtosecond laser deposition of diamond-like carbon thin films

Qian

Crăciun

Singh

et al. 1999

Journal of Applied Physics

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“…In this paper we describe an existence-parameter study of solitons and double layers (DLs) in plasmas composed of double Maxwell-Boltzmann electron species and two adiabatic fluid ion species where the ions are assumed to be singly charged. Such plasmas occur commonly in space (Temerin et al 1982;Mozer & Temerin 1983;Hudson et al 1983;Bostrom et al 1988) and many laboratory situations (Jones et al 1975;Nishida & Nagasawa 1986;Nakamura 1987), particularly in lasers (Giovanielli, Kephart & Williams 1976;Estabrook & Kruer 1978;Bezzerides, Forslund & Lindman 1978;Ludmirsky et al 1985), and have been the subject of several theoretical studies (Jones et, al. 1975;Buti 1980;Nishihara & Tajiri 1981;Raychaudhuri et al 1985;Erokhin & Tsybenko 1986;Bharuthram & Shukla 1986).…”

Section: Introductionmentioning

confidence: 99%

Cut-off conditions and existence domains for large-amplitude ion-acoustic solitons and double layers in fluid plasmas

1990

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It is shown how existence domains for arbitrary-amplitude ion-acoustic solitons and double layers are determined numerically by cut-off conditions on the corresponding Sagdeev potential. A two-electron-temperature model is considered, and in positive-ion plasmas the cut-off conditions are given in terms of the electron parameters, while for negative-ion plasmas such conditions are described in terms of parameters characterizing the role of the negative ion species.

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“…L'étude du rayonnement X dur obtenu lors d'une interaction laser-plasma a fait l'objet de nombreuses études dans plusieurs laboratoires. Les premières expériences ont été réalisées avec de très grosses installations laser de puissance délivrant des impulsions laser relativement longues (nanoseconde) dans le domaine de l'infra-rouge [2][3][4][5][6][7][8][9]. Le développement de ces sources X pour l'imagerie médicale a été proposé très tôt [10].…”

Section: Introductionunclassified