J A del Val

Measurement of Stark broadening and shift parameters of several Ar I lines

This work reports Stark shifts and widths of 15 Ar I lines measured in a pulsed arc. Plasma parameters, electron density and temperature, range in this experiment from 0.25 to and from 13 500 to 26 500 K, respectively. The former has been measured interferometrically at a single wavelength and spectroscopically from the -Stark broadening. The latter has been measured from the Boltzmann plot of Ar II lines and from the ratio of Ar II and Ar I line intensities. Comparisons with most of the data published to date about this topic in Ar I are also included.

Stark broadening and shift measurements of visible Si II lines

A set of experimental Stark width and shift parameters of visible singly ionized silicon spectral lines is reported in this paper. Measurements have been made on a pulsed plasma generated in a linear discharge lamp filled with a mixture of silane and helium. Electron density and temperature in this plasma range from 0.2 to 0.9 × 1023 m−3 and from 16 000 to 20 000 K respectively. Electron density has been simultaneously determined by two-wavelength interferometry and from Stark broadening of He I 501.6 nm, He I 728.1 nm and Hα lines. Temperature has been simultaneously determined from a Boltzmann plot of He I lines, from absolute emission of He I lines and from a Boltzmann plot of Si II lines. Dependences of measured Stark parameters on electron density and temperature have been investigated and the final results have been compared with most of the previous experimental data as well as with some theoretical models.

Measurement of Stark broadening and shift of visible N II lines

This work reports information about Stark broadening and shift parameters of a very extensive collection of visible singly ionized nitrogen lines. All of them were measured in a linear discharge lamp from a mixture of nitrogen and helium. Electron density and temperature range in this experiment from 0.2 to 1.1 × 1023 m-3 and from 17 000 to 29 000 K, respectively. The first one has been simultaneously determined from two-wavelength interferometry and from the Stark broadening of He I 471.3 nm, the second from a Boltzmann plot of N II lines and from N II/N I intensity ratios. Dependences of these Stark parameters with temperature and electron density have been investigated and the final results have been compared with most of the previous experimental data as well as with two theoretical models. All relevant details relative to this experiment are given in the paper.

Experimental Stark Widths and Shifts of Several Ne I Spectral Lines

This work reports data of Stark widths and shifts of 37 Ne I lines that have been measured as functions of electron density and temperature in the ranges (0.07-1.85)×1023 m-3 and 13,900-20,700 K, respectively. A pulsed arc was used as a plasma source. The electron density was measured by single-wavelength interferometry using the 488.0 nm transition of an Argon ion laser and has also been determined from Hα Stark broadening. The plasma temperature has been determined from the Boltzmann plot of Ne I lines and estimated from the Saha law. Linear fits have been performed between Stark parameters and electron density, and possible dependencies on temperature have been checked. The measured parameters are compared with theoretical and experimental data taken from the literature.

Measurement of Stark broadening and shift constants of singly ionized krypton lines

Stark widths and shifts of 25 visible singly ionized krypton lines are presented in this paper. All of them were measured in a pulsed discharge lamp from a mixture of krypton and helium. The electron density, which typically ranges from 0.2 to 1.8×1023 m-3 has been simultaneously determined from two-wavelength interferometry and from the Stark broadening of the He I 388.865 nm. The excitation temperature, from 16 000 to 24 500 K, has been measured from the Boltzmann plot of Kr II lines, which has allowed us to recalculate some Kr II transition probabilities. Comparisons with most of the data published to date about this topic in Kr II are also included.

Measurement of Stark parameters of HeII P

This work reports information on the pressure broadened profiles of the Hell P α , P β and P γ spectral lines measured in a pulsed discharge lamp. Information relative to the line shapes, full width at ½, 1/4 and 1/8 of the maximum intensity and the dip of the Hell 320.3 nm is provided. The electron density has been determined by two-wavelength interferometry and from the Stark width of the Hel 501.6 nm. and ranges during the Hell emission from 0.54 to 0.64 x 10 2 3 m - 3 in the plasma. Temperature (1.7-2.4 eV) has been simultaneously determined from the Boltzmann-plot of Hel and from local thermodynamic equilibrium (LTE) assumptions. The final results have been compared with most of the previous existing data.

\mathsf{_\alpha}

This work reports atomic transition probabilities of 33 spectral lines belonging to 3s-3p, 3p-3d and 3d-4f multiplets of O II, all of them measured in the 405-465 nm spectral region in an emission experiment. Relative intensity measurements have been made on a pulsed discharge lamp and the absolute Aki-values have been obtained taking the NIST database as a reference in temperature diagnosis. The results of this work confirm the other recent available data measured by Veres and Wiese (Veres G and Wiese W L 1996 Phys. Rev. A 54 1999) with a different source and the calculations of Bell et al (Bell K L, Hibbert A, Stafford R P and McLaughlin B M 1994 Phys. Scr. 50 343) with a very satisfactory agreement (usually within 10%).

, P

This work reports a collection of 35 transition probabilities of lines in the spectral region 450{580 nm, all of them measured in an emission experiment. Relative intensity measurements have been made in a pulsed discharge lamp and the absolute Aki values have been obtained by using reference data taken from the literature. The electron density has been determined by two-wavelength interferometry and ranges from 0: 1t o 0:810 23 m 3 in the plasma. Temperature (14 000{24 000 K) has been simultaneously determined from three dierent methods, including the Boltzmann-plot of KrII lines and the KrII/KrI intensities ratios. The nal results have been compared with most of the previous existing data.

\mathsf{_\beta}

In this work, we demonstrate the high potential of two-photon excitation of the 1S -2S transition of atomic hydrogen followed by optogalvanic detection, for measuring under identical experimental conditions, the kinetic temperature and the electric field strength in the cathode sheath region of a hollow cathode discharge. The first obtained results for both parameters are discussed in this paper.

and P

A set of experimental Stark width and shift parameters of visible singly ionized silicon spectral lines is reported. Measurements have been made on a pulsed plasma generated in a linear discharge lamp filled with a mixture of silane and helium. Electron density and temperature in this plasma range from 0.2 to 0.9×1023 m−3 and from 16 000 K to 20 000 K, respectively. The electron density has been simultaneously determined by two-wavelength interferometry and from the Stark broadening of the He I 501.6 nm, He I 728.1 nm and Hα lines. The temperature has been simultaneously determined from a Boltzmann-plot of He I lines, from the absolute emission of He I lines, and from a Boltzmann-plot of Si II lines. Dependencies of the measured Stark parameters on electron density and temperature have been investigated.