Vacuum Ultraviolet Spectroscopy Study of Excimer Lasergfenerated Plasmas: Spatial Distribution of Plasma

1992 ◽  
Vol 285 ◽  
Author(s):  
D.B. Chrise ◽  
G. Mehbnan ◽  
J.S. Horwit ◽  
P.G. Burkhalte ◽  
D.A. Newman ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Vacuum Ultraviolet ◽  
Plasma Temperature ◽  
Emission Spectra ◽  
Target Surface ◽  
Plasma Emission ◽  
Ultraviolet Emission ◽  
Electronic Density ◽  
Line Intensities ◽  
Relative Line

ABSTRACTEmission spectra from 1200 Å to 3500 Å have been measured for laser-generated plasmas produced by the focused output (1−4 J/cm2)of a Kr-F excimer.laser onto solid targets of single and multicomponent materials (e.g., Al, Y2O3, BaO, Cu, and YBa2Cu3O7−δ). We have measured the spatial distribution and fluence dependence of the plasma emission. The emission spectra indicated that very large density gradients from the large opacity at the target surface were present. In general, the spectra were dominated by excited neutrals and singly and doubly ionized species. Plasma emission spectra from Al have been analyzed in more detail to derive plasma temperature and density. A plasma temperature of 2 eV and an electronic density of ∼1018/cm3 at 2 J/cm2 was estimated from the relative line intensities. Spatial variation of the total vacuum ultraviolet emission provided evidence for laser absorptionin the ablated material.

scholarly journals The Ultraviolet Emission Spectra of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 77-86 ◽  
Author(s):  
D.R. Flower
Keyword(s):  
Thermal Structure ◽  
Central Zone ◽  
Emission Spectra ◽  
Absolute Intensity ◽  
Atomic Data ◽  
Ultraviolet Emission ◽  
Detailed Model ◽  
Line Intensities ◽  
Relative Line ◽  
Wide Range

Calculations show that high-excitation planetaries emit about the same total intensity of collisionally excited radiation in the unobserved ultraviolet part of the spectrum as in the visible. This ultraviolet radiation emanates from a central zone where the electron temperature is high due to absorption of He II Ly-α photons. Intensities of lines which one might expect to detect in the ultraviolet have been calculated using revised atomic data and a detailed model of the ionization and thermal structure of the central zone. Relative line intensities are presented for a wide range of excitation in the nebula. In particular, the absolute intensity of the C IV doublet at 1550 Å has been calculated for 4 selected planetaries.

Theoretical studies of vacuum ultraviolet emission spectra of NeLi+ and ArLi+

1991 ◽  
Vol 94 (5) ◽  
pp. 3707-3714 ◽  
Author(s):  
Suehiro Iwata ◽  
Shinkoh Nanbu ◽  
Hideki Kitajima
Keyword(s):  
Vacuum Ultraviolet ◽  
Emission Spectra ◽  
Theoretical Studies ◽  
Ultraviolet Emission

Vacuum ultraviolet emission spectra of the helium and neon alkali ions in the range between 60–80 nm

1991 ◽  
Vol 94 (12) ◽  
pp. 7769-7774 ◽  
Author(s):  
K. Petkau ◽  
J. W. Hammer ◽  
G. Herre ◽  
M. Mantel ◽  
H. Langhoff
Keyword(s):  
Vacuum Ultraviolet ◽  
Emission Spectra ◽  
Ultraviolet Emission ◽  
Alkali Ions

scholarly journals Evidence for extended chromospheres and transition zones in the uv spectra of FK comae stars

1987 ◽  
Vol 122 ◽  
pp. 363-366
Author(s):  
L. Bianchi ◽  
M. Grewing
Keyword(s):  
Emission Measure ◽  
Uv Spectra ◽  
Main Sequence Stars ◽  
Ultraviolet Emission ◽  
Transition Zones ◽  
Giant Stars ◽  
Line Intensities ◽  
Relative Line ◽  
Measure Distribution ◽  
Fast Rotating

The chromospheres and transition zones of the fast rotating giants of the FK Comae type can be studied by analysing their ultraviolet emission line spectra. From relative line intensities, electron densities of the order of 1010to 1011cm−1 are found for the region where the Si IV emission arises. The sizes of the chromospheres and transition regions can be inferred from the emission measure distribution, and a temperature-height relation can be found on the assumption that hydrostatic equilibrium holds. We find the atmospheres of these stars to be clearly more extended than those of normal giant stars, and the flux in the higher excitation chromospheric and transition zone lines (e.g. C II, C IV, Si IV) is significantly stronger than in other stars of similar spectral type. Indeed, the location of these stars in the standard rotation-activity-correlation diagrams places them close to or even above the saturation limit for main sequence stars.

Relative line intensities in the argon L x-ray emission spectra produced by 0.3 to 3 keV electron impact

1979 ◽  
Vol 70 (2) ◽  
pp. 99-102 ◽  
Author(s):  
J.-J. Bonnet ◽  
D. Hubert ◽  
F. Bonnet ◽  
M. Bonnefoy ◽  
A. Fleury ◽  
...  
Keyword(s):  
Electron Impact ◽  
Emission Spectra ◽  
X Ray ◽  
Line Intensities ◽  
Relative Line

scholarly journals Effect of Laser Energy and Repetition Rate on Holmium Plasma Emission

2020 ◽  
Vol 18 (44) ◽  
pp. 98-108
Author(s):  
Nipras Nazeh Mahmoad ◽  
Mahmoad Shakir Mahmoad
Keyword(s):  
Laser Pulse ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Laser Pulse Energy ◽  
Laser Energy ◽  
Emission Spectra ◽  
Maximum Intensity ◽  
Plasma Emission ◽  
Line Intensities ◽  
Pulse Energies

The holmium plasma induced by a 1064-nmQ-switched Nd:YAG laser in air was investigated. This work was done theoretically and experimentally.  Cowan code was used to get the emission spectra for different transition of the holmium target. In the experimental work, the evolution of the plasma was studied by acquiring spectral images at different laser pulse energies (600,650,700, 750, and 800 mJ). The repetition rates of (1Hz and 10Hz) in the UV region (200-400 nm). The results indicate that, the emission line intensities increase with increasing of the laser pulse energy and repetition rate. The strongest emission spectra appeared when the laser pulse energy is 800mJ and 10 Hz repetition rate at λ= 345.64nm, with the maximum intensity of 77000 counts.

Exciplex vacuum ultraviolet emission spectra of KrAr: Temperature dependence and potentials

1996 ◽  
Vol 105 (20) ◽  
pp. 9021-9026 ◽  
Author(s):  
J.‐L. Subtil ◽  
C. Jonin ◽  
P. Laporte ◽  
R. Reininger ◽  
F. Spiegelmann ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Vacuum Ultraviolet ◽  
Emission Spectra ◽  
Ultraviolet Emission

High-resolution far ultraviolet emission spectra of electron-excited molecular deuterium

1999 ◽  
Vol 32 (15) ◽  
pp. 3813-3838 ◽  
Author(s):  
H Abgrall ◽  
E Roueff ◽  
Xianming Liu ◽  
D E Shemansky ◽  
G K James
Keyword(s):  
High Resolution ◽  
Emission Spectra ◽  
Ultraviolet Emission ◽  
Far Ultraviolet

Systematic investigation of plasma emission spectra during microwave diamond deposition from CH4CO2 and C2H2CO2 gas mixtures

1993 ◽  
Vol 2 (2-4) ◽  
pp. 389-392 ◽  
Author(s):  
G. Balestrino ◽  
M. Marinelli ◽  
E. Milani ◽  
A. Paoletti ◽  
P. Paroli ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Gas Mixtures ◽  
Systematic Investigation ◽  
Plasma Emission ◽  
Diamond Deposition ◽  
Co2 Gas
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