Time resolved laser induced fluorescence on argon intermediate pressure microwave discharges: Measuring the depopulation rates of the 4p and 5p excited levels as induced by electron and atom collisions

Palomares, JM Jose; Graef, Waad Wouter; Hübner, S Simon; Mullen, van der Jjam Joost

doi:10.1016/j.sab.2013.06.010

Cited by 5 publications

(3 citation statements)

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“…where γ is a factor that scales the magnitude of the cross-section and M g is the mass of the argon atoms. Values of K ij a are anticipated to be on the order of 10 −10 cm 3 s −1 [38,39].…”

Section: Iib Two State Model To Simulate Lcifmentioning

confidence: 99%

“…In this paper, the development and application of the planar LCIF technique as a diagnostic of electron density and 'electron temperature' is described for low temperature, low pressure plasmas generated with argon. While various forms of the LCIF technique have been demonstrated in the argon environment [29,[37][38][39][40], the bulk of these studies focused on quantifying either the relaxation rate of the laser excited state or the repopulation rate of the laser-depleted state due to collisions with the plasma species (neutrals and electrons). The study performed by Stewart and Smith [29] utilized a continuous-wave (cw) variation of the LCIF method as a means of assessing electron temperatures.…”

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confidence: 99%

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2D laser-collision induced fluorescence in low-pressure argon discharges

Barnat

Weatherford

2015

Plasma Sources Sci. Technol.

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Development and application of laser-collision induced fluorescence (LCIF) diagnostic technique is presented for the use of interrogating argon plasma discharges. Key atomic states of argon utilized for the LCIF method are identified. A simplified two-state collisional radiative model is then used to establish scaling relations between the LCIF, electron density, and reduced electric fields (E/N). The procedure used to generate, detect and calibrate the LCIF in controlled plasma environments is discussed in detail. LCIF emanating from an argon discharge is then presented for electron densities spanning 10 9 e cm −3 to 10 12 e cm −3 and reduced electric fields spanning 0.1 Td to 40 Td. Finally, application of the LCIF technique for measuring the spatial distribution of both electron densities and reduced electric field is demonstrated.

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Section: Iib Two State Model To Simulate Lcifmentioning

confidence: 99%

mentioning

confidence: 99%

2D laser-collision induced fluorescence in low-pressure argon discharges

Barnat

Weatherford

2015

Plasma Sources Sci. Technol.

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“…Optimal LIF techniques take advantage of absorption transitions in the visible range, where specialized optics and sensors are not required, and observe long-lived, metastable states that closely approximate the ground state. In argon, such metastable techniques have been used to study reaction kinetics using pulsed lasers [23], to achieve high velocityresolution using Lamb dip spectroscopy [24], and to measure state distributions in unmagnetized plasmas [23,25].…”

Section: Introductionmentioning

confidence: 99%

Laser induced fluorescence of Ar-I metastables in the presence of a magnetic field

Thompson

Steinberger

Keesee

et al. 2018

Plasma Sources Sci. Technol.

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We compare three laser induced fluorescence schemes for measuring velocity distributions of Ar-I 1s 5 metastables in the presence of a magnetic field. In these three-level schemes, the 1s 5 state is optically pumped to 2p 2 , 2p 3 , or 2p 4 by sweeping the frequency of a tuneable CW laser over transitions in the visible range at 696.7352 nm, 706.9167 nm, and 714.9012 nm, respectively. Broadening in the fluorescence spectra is attributed to Zeeman splitting and saturation effects. We present measurements of spectral broadening dependence on injected laser intensity and describe spectral reconstructions that account for Zeeman splitting. For laser injection parallel to a background magnetic field, the separation of the Zeeman-split σ ± clusters is an effective, non-perturbative localized magnetic field diagnostic. We discuss the advantages of the three transition schemes and present the optimal transition for several applications.

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