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FIZIKA A 10 (2001) 4 , 215-224
 
STUDY OF LASER-PRODUCED PLASMAS FROM BORON, CARBON AND BORON-CARBIDE
TARGETS
VIŠNJA HENČ-BARTOLIĆa, EVA KOVAČEVIĆa, TAREK
ATWEEb, HANS-JOACHIM KUNZEb and MIRKO STUBIČARc
aDepartment of Applied Physics, Faculty of Electrical
Engineering and Computing, University of Zagreb, HR-10000 Zagreb, Croatia
bInstitut für Experimentalphysik V, Ruhr Universität
Bochum, D-44801 Bochum, Germany
cDepartment of Physics, Faculty of Science, University of
Zagreb, HR-10000 Zagreb, Croatia
Dedicated to Professor Kseno Ilakovac on the occasion of his 70th
birthday
Received 8 May 2001; revised manuscript received 15 January 2002
Accepted 28 January 2002 Online 6 April 2002
Spectroscopic investigations were made on plasma clouds created by 20 ns, 3 J ruby
laser pulses impinging perpendicularly onto targets of boron carbide, carbon and boron.
The irradiance on the targets was about 132 GW cm-2.
Time-resolved spectra of plasmas in the region of wavelength from 16 to 32 nm were
observed at a distance of 1 mm from the targets. The maximum electron temperatures were
about 60 eV in the case of carbon and boron targets, and about 45 eV in the case of
boron-carbide target. Laser evaporation from carbon occurred directly from the solid state
(sublimation), and in the case of a boron and boron-carbide melting was observed as an
intermediate state.
PACS numbers: 52.50.Jm, 61.80.Ba
UDC 533.9
Keywords: Laser-produced plasmas from boron, carbon and boron-carbide (B4C)
targets, spectral analysis, light-microscopic surface observation
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