Results 241 to 250 of about 156,036 (282)

Using Saha‐Boltzmann Plot to Diagnose Lightning Return Stroke Channel Temperature

Journal of Geophysical Research: Atmospheres, 2019
AbstractBased on the high time‐resolved spectra of a cloud‐to‐ground lightning flash with seven return strokes captured by a high‐speed slitless spectrograph, this work was the first to use the Saha‐Boltzmann plot method for the determination of the lightning return stroke channel temperature. The channel temperatures of the seven return strokes ranged
Guorong Liu, Ping Yuan, Tingting An, Duixiong Sun, Jianyong Cen, Xuejuan Wang   +5 more
openaire   +1 more source

Polyelectrolytes in mixed salts: Scatchard plots obtained by means of Poisson-Boltzmann calculations

Biophysical Chemistry, 1992
Abstract The problem of the interaction between dilute polyelectrolytes and divalent counterions in the presence of a supporting uni-univalent salt is approached by means of Poisson-Boltzmann calculations. A very general definition of “bound” and “free” concentrations is given under limiting conditions, but it is shown that it can be retained also at
FOGOLARI, Federico, MANZINI G, QUADRIFOGLIO F.   +2 more
openaire   +1 more source

Physical Properties of the BLR of AGN: Boltzmann-Plot vs. CLOUDY Models

AIP Conference Proceedings, 2007
There are different spectroscopic methods for direct diagnostics of emitting plasma in astrophysical objects, but these methods could not be used in the case of the Broad Line Region (BLR) of Active Galactic Nuclei (AGN). Here we combine the Boltzmann‐plot (BP) method [1], [2] and calculations performed with the photoionization code CLOUDY [3] in order
Dragana Ilić, Luka Č. Popović, Stefano Ciroi, Giovanni La Mura, Piero Rafanelli, Luka Č. Popović, Milan S. Dimitrijević   +6 more
openaire   +2 more sources

Stark width measurements and Boltzmann plots of W I in nanosecond laser-induced plasmas

Journal of Physics D: Applied Physics, 2015
We report the first measurements of Stark broadening widths of W I lines (426.9?nm, 429.4?nm, and 430.2?nm) as a function of electron density, . The electron density is obtained from Stark broadening of a C II line at 426.7?nm in nanosecond laser-induced tungsten carbide plasmas. A linear relation between the W I Stark widths and is confirmed.
D Nishijima, R P Doerner
openaire   +1 more source

Multi-element Saha Boltzmann plot (MESBP) coupled calibration-free laser-induced breakdown spectroscopy (CF-LIBS): an efficient approach for quantitative elemental analysis

Journal of Analytical Atomic Spectrometry, 2022
MESBP coupled CF-LIBS approach for quantitative elemental analysis of multi-element samples.
Lekha Mary John, R. C. Issac, S. Sankararaman, K. K. Anoop   +3 more
openaire   +1 more source

Study of optical emission spectroscopy using modified Boltzmann plot in dual-frequency synchronized pulsed capacitively coupled discharges with DC bias at low-pressure in Ar/O₂/C₄F₈ plasma etching process

Physical Chemistry Chemical Physics, 2022
A modified Boltzmann equation using the corona model was used to study the plasma characteristics of a pulse plasma etching process.
Bibhuti Bhusan Sahu, Kazuya Nakane, Kenji Ishikawa, Makoto Sekine, Takayoshi Tsutsumi, Taku Gohira, Yoshinobu Ohya, Noriyasu Ohno, Masaru Hori   +8 more
openaire   +2 more sources

Measurement of atomic transition probabilities with laser-induced breakdown spectroscopy using the 3D Boltzmann plot method

Spectrochimica Acta Part B: Atomic Spectroscopy, 2019
Abstract This work presents a method for the determination of atomic transition probability of the emission lines of a given element using the 3D Boltzmann plot method. The method exploits the third (temporal) dimension of a classical 2D Boltzmann plot for the determination of the plasma parameters.
Urbina Medina, Ivan Alexander, Carneiro, D., Rocha, S., Farías, Eliel Eleutério, Bredice, Fausto Osvaldo, Palleschi, Vincenzo   +5 more
openaire   +2 more sources

Iterative Boltzmann plot method for temperature and pressure determination in a xenon high pressure discharge lamp

Journal of Applied Physics, 2013
The Boltzmann plot method allows to calculate plasma temperatures and pressures if absolutely calibrated emission coefficients of spectral lines are available. However, xenon arcs are not very well suited to be analyzed this way, as there are only a limited number of lines with atomic data available. These lines have high excitation energies in a small
J. Zalach, St. Franke
openaire   +1 more source

Using Boltzmann Plots Method to Calculate Plasma Parameters Generated from a Magnesium Target Using Optical Emission Spectroscopy Technique

International Journal of Nanoscience, 2022
The laser-generated plasma was characterized using laser-induced breakdown spectroscopy after fundamental radiation from a Nd:YAG laser with an energy range of 300–500 mJ was focused onto a magnesium target. Using magnesium emission lines and Boltzmann plots, the plasma parameters were computed based on experimental data.
openaire   +1 more source

Application of Calibration-Free Boltzmann Plot Method for Composition and Pressure Measurement in Argon Free-Burning Arcs

Plasma Chemistry and Plasma Processing, 2019
Arc plasmas have been extensively studied, experimentally and by means of modeling, due to their wide range of applications. In this article, a calibration-free Boltzmann plot method was applied to measure the species composition and pressure in the arc plasmas based on the assumption of local thermodynamic equilibrium and only single ionization of ...
Hantian Zhang, Yi Wu, Hao Sun, Fei Yang, Mingzhe Rong, Fengfeng Jiang, Chunlin Wang, Wei Huang   +7 more
openaire   +1 more source