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Titolo:
2-COMPONENT STRUCTURE IN THE ANGULAR EMISSION OF A LASER-PRODUCED TA PLASMA
Autore:
THUM A; RUPP A; ROHR K;
Indirizzi:
UNIV KAISERSLAUTERN,FACHBEREICH PHYS D-67663 KAISERSLAUTERN GERMANY
Titolo Testata:
Journal of physics. D, Applied physics
fascicolo: 8, volume: 27, anno: 1994,
pagine: 1791 - 1794
SICI:
0022-3727(1994)27:8<1791:2SITAE>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
THIN-FILMS; ION EMISSION; DEPOSITION; DESORPTION; ABLATION; TARGET;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
A. Thum et al., "2-COMPONENT STRUCTURE IN THE ANGULAR EMISSION OF A LASER-PRODUCED TA PLASMA", Journal of physics. D, Applied physics, 27(8), 1994, pp. 1791-1794

Abstract

The particle flux produced by an obliquely incident Nd Q-switched pulse (20 ns) on a Ta target has been analysed with regard to its angulardistribution resolved for both its neutral and ion components. The laser intensity has been varied in the range between about 10(10)-10(11)W CM-2, which is appropriate for many low-irradiance applications. Itis observed that, at all emission angles and for the whole range of laser intensities, the number of neutral species clearly dominates the composition of the particles. At 1.3 x 10(10) W CM-2 the total number of emitted particles is 4 x 10(14), scaling as E(L)3/4 with the laser energy. While for relatively low laser energies the angular distribution shows the usual smooth cos-behaviour, an additional strong directive emission cone, superimposed upon the cos-distribution, develops if the laser energy is enhanced. Both the strength and the width strongly depend on the laser intensity. While at lower intensities a fit by a cos(n) function with n almost-equal-to 10 seems appropriate, n increases to 26 at an intensity of 10(11) W cm-2. It can be assumed that secondary energy transfer processes that are not yet fully understood are responsible for this anomalous emission.

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Documento generato il 28/03/20 alle ore 10:53:41