Spectroscopic studies of a laser-produced carbon plasma in the near and extreme ultraviolet

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7184230

Iglesias, E J

This work deals mainly with the line emission from C V and C VI ions in a plasma produced when a ruby laser pulse (power density > 10/sup 12/ W/cm/sup 2/) is focused onto a polyethelene target under vacuum. The plasma emission was temporally and spatially resolved using near ultraviolet (NUV) and extreme ultraviolet (XUV) diagnostics. In the NUV, line profiles of the ..delta..n = O, n = 2 transitions of C V (2271, 2277, and 3526 A) and then n = 7 ..-->.. 6 transition of C VI (3434 A) at 3 mm from the target surface were measured. The ..delta..n = O measured profiles resulted in widths larger than what could be estimated from considering the thermal Doppler broadening, motional Doppler shifts and Stark broadening from the different emission regions of the plasma. In the XUV region, profiles of members (Ly/sub ..beta../, Ly/sub delta/) of the Lyman series of (H/sub ..cap alpha../, H/sub ..beta../) of the Balmer series of C VI close to the target surface, as well as the helium-like and hydrogen-like recombination continua were measured. The width of H/sub ..beta../ and Ly/sub delta/ provided an estimated electron density (10/sup 20/ cm/sup -3/). From the recombination continuum, an electron temperature (approx. 60 eV), also near the target surface was obtained.

• Research Organization: Maryland Univ., College Park (USA)
• OSTI ID: 7184230
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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BALMER LINES
CARBON
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELEMENTS
EXTREME ULTRAVIOLET RADIATION
LASER-PRODUCED PLASMA
LINE BROADENING
LYMAN LINES
NEAR ULTRAVIOLET RADIATION
NONMETALS
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
SPECTRA
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA