Detection of Cl and chlorine‐containing negative ions in rf plasmas by two‐photon laser‐induced fluorescence

1987 ◽  
Vol 51 (12) ◽  
pp. 898-900 ◽  
Author(s):  
Gary S. Selwyn ◽  
L. D. Baston ◽  
H. H. Sawin
Keyword(s):  
Negative Ions ◽  
Laser Induced Fluorescence ◽  
Rf Plasmas ◽  
Two Photon

Studies of Plasma O Atom Concentration by Two-Photon Laser Induced Fluorescence and Optical Emission Spectroscopy

1984 ◽  
Vol 38 ◽  
Author(s):  
R. Walkup ◽  
K. Saenger ◽  
G. S. Selwyn
Keyword(s):  
Optical Emission ◽  
Quantitative Relationship ◽  
Laser Induced Fluorescence ◽  
Plasma Parameters ◽  
Atom Concentration ◽  
Rf Plasmas ◽  
Excited Atoms ◽  
Two Photon ◽  
Spatially Resolved ◽  
Quantitative Measurements

AbstractWe report quantitative measurements of the concentration of atomic oxygen in RF plasmas determined by two-photon laser induced fluorescence. The results are compared with concurrent measurements of spatially resolved plasma induced optical emission. These measurements establish: (1) the O atom concentration as a function of plasma parameters, (2) a semi-quantitative relationship between O* emission intensity normalized by Ar* in-tensity and O atom concentration, and (3) an understanding of the mechanisms for pro-duction of excited atoms in the plasma.

Imaging hydrogen flames by two-photon, laser-induced fluorescence

1991 ◽  
Author(s):  
R. MILES ◽  
W. LEMPERT ◽  
V. KUMAR ◽  
G. DISKIN
Keyword(s):  
Laser Induced Fluorescence ◽  
Two Photon

scholarly journals Progresses on the Use of Two-Photon Absorption Laser Induced Fluorescence (TALIF) Diagnostics for Measuring Absolute Atomic Densities in Plasmas and Flames

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 145-171
Author(s):  
Kristaq Gazeli ◽  
Guillaume Lombardi ◽  
Xavier Aubert ◽  
Corinne Y. Duluard ◽  
Swaminathan Prasanna ◽  
...  
Keyword(s):  
Optical Transition ◽  
Thin Film Deposition ◽  
Laser Induced Fluorescence ◽  
Film Deposition ◽  
Stimulated Emission ◽  
Photon Absorption ◽  
Collisional Quenching ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Wide Range

Recent developments in plasma science and technology have opened new areas of research both for fundamental purposes (e.g., description of key physical phenomena involved in laboratory plasmas) and novel applications (material synthesis, microelectronics, thin film deposition, biomedicine, environment, flow control, to name a few). With the increasing availability of advanced optical diagnostics (fast framing imaging, gas flow visualization, emission/absorption spectroscopy, etc.), a better understanding of the physicochemical processes taking place in different electrical discharges has been achieved. In this direction, the implementation of fast (ns) and ultrafast (ps and fs) lasers has been essential for the precise determination of the electron density and temperature, the axial and radial gradients of electric fields, the gas temperature, and the absolute density of ground-state reactive atoms and molecules in non-equilibrium plasmas. For those species, the use of laser-based spectroscopy has led to their in situ quantification with high temporal and spatial resolution, with excellent sensitivity. The present review is dedicated to the advances of two-photon absorption laser induced fluorescence (TALIF) techniques for the measurement of reactive species densities (particularly atoms such as N, H and O) in a wide range of pressures in plasmas and flames. The requirements for the appropriate implementation of TALIF techniques as well as their fundamental principles are presented based on representative published works. The limitations on the density determination imposed by different factors are also discussed. These may refer to the increasing pressure of the probed medium (leading to a significant collisional quenching of excited states), and other issues originating in the high instantaneous power density of the lasers used (such as photodissociation, amplified stimulated emission, and photoionization, resulting to the saturation of the optical transition of interest).

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