Electron concentration measurement in the high voltage spark using stark broadening of Hβ emission

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

“…155 Due to the analytical perspective, the early studies in the eld mostly focused on the direct analysis of the emitted light in order to understand the sampling and excitation mechanisms taking place in the spark. 156 Those studies mostly included the determination of the concentration of the ions and electrons by utilizing the Stark effect, 64 or laser scattering, 157 or interferometry. 158 Calculation of the plasma temperature by means of the Boltzmann 159 or the Saha-Boltzmann plot method 51 has also been carried out.…”

“…Due to the availability of precise tabulated data and validated theoretical description, the Stark broadening of H linesespecially the H b lineare widely used to determine the electron concentration in plasmas. [64][65][66] If H atoms are not present in the plasma, other elements can also be used to estimate the electron concentration, however, in this case the accuracy is usually lower, deviations typically in the range of 15-50% can be found. 65,67 Even though, various theoretical models exist to interpret Stark-broadened spectral lines, 68 in most of the practical cases electron concentration is estimated based on the comparison of the broadened full width at half maximum (FWHM) or line shi with reference data, 69 tabulated for various transitions.…”

Dense Metal Plasma in a Solenoid for Ion Beam Neutralization

“…The H  line is a much-used spectral line for which line broadening is well investigated [21][22][23]. Assuming for a moment a uniform plasma and the dominance of Stark broadening over any other broadening mechanism for the H  line, the electron density n e (in cm -3 ) can be determined by  is 0.08±0.02 for the H  line [22,24].…”

Spectrometric System for Characterizing Drop and Powder Trajectories and Chemistry in Reactive Flows

“…Stigmatic imaging was based on the work of Goldstein and Walters 29 as later implemented by Klueppel et al, 30 Hsu et al, 31 Scheeline et al, 32 and Scheeline et al 33 In this arrangement, images are relayed from point to point FIG. 1.…”

“…The 600 m m and 1000 mm feed optics for the nondispersed focal plane and spectrograph, respectively, were those previously used in a time-resolved, space-resolved spectrometric system used for observing spark discharges and theta pinches. 32 The mirrors were remounted so that the off-axis angles were those listed in Table II. The down-link from the reactor to the main assembly of feed optics used newly obtained m irrors (Astronomically Xenogenic Enterprises, (AXE) Tucson, AZ) of 1270 6 1 mm focal length.…”