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- W2022970114 abstract "Energy coupling, propagation, excitation and relaxation processes in the inductively coupled plasma have been studied by modulating the power delivered to the plasma. Spatially and temporally resolved emission from Ar I, Ca II, Ca I and Li I in response to abrupt changes in power from 450 to 1000 W was measured. The emission intensities begin to fall within 100–300 μs of the high to low power transition. However, a spatially and species dependent delay of up to 3 ms is observed between the sudden change from low to high power and an increase in the emission intensities. At 20 mm above the load coil, Ca I emission intensity increases about 1 ms before an increase in the Ar I or Ca II intensities. Changes in the outer and central flow rates were found to have little effect on relaxation processes responsible for decay in emission after the power is abruptly decreased. However, an increase in the outer flow rate decreases the delay time between the low to high power transition and the increase in emission intensity. The data show that two ingredients seem to be necessary for analyte excitation: species (most likely electrons) created low and away from the radial center of the plasma must be transported upward and inward, and a direct coupling of energy into the analytical zone must occur. The excitation mechanisms or energy requirements for production of Ca I and Ca II emission are found to be different." @default.
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- W2022970114 date "1987-01-01" @default.
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- W2022970114 title "Analyte excitation in the inductively coupled plasma studied by power modulation" @default.
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- W2022970114 doi "https://doi.org/10.1016/0584-8547(87)80078-2" @default.
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