2023
DOI: 10.1039/d2ja00256f
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Influence of ambient pressure on spatial–temporal evolution of local thermodynamic equilibrium for laser-induced plasma

Abstract: Laser-induced breakdown spectroscopy (LIBS) is used for quantitative detection based on the fact that the laser-induced plasma (LIP) is in local thermodynamic equilibrium (LTE). But the radiation lifetime of the...

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Cited by 5 publications
(4 citation statements)
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“…Due to the strong ionic radiation and continuous background radiation at the earlier stage of LIP, the spectral intensity of the atomic line cannot be accurately obtained, and thus only the LIP in the middle and later times is analyzed: the delay time T d is from 300 ns to 3500 ns at 10 3 Pa, the delay time T d is from 400 ns to 6000 ns at 10 4 Pa, and the delay time T d is from 600 ns to 6000 ns at 10 5 Pa. One can see from figure 6(a) that the minimum electron density n e decreases against the delay time T d and is greater than the electron density n e obtained in the experiment within the measurement time when the air pressure is 10 3 Pa; this means that LIP in the present study at 10 3 Pa does not meet the McWhirter criterion when the delay time T d is from 300 ns to 3500 ns, and it has deviated from LTE. In our previous work [16], we also studied the time points at which the LIP deviated from LTE using the coefficient v; the results show that the time point is closer to the moment of the pulsed laser energy peak in a lower ambient pressure environment, which can be verified with the conclusion of the present work. At evaluate the LTE of LIP are the cumulative spectra obtained from r = −4 mm to r = 4 mm; the LIP core has stronger radiation, higher electron temperature, higher electron density, and longer LTE duration; therefore, the time point at which the LIP did not satisfy the McWhirter criterion in the previous work is later than that in the present work.…”
Section: Radial Distribution Of Lip Satisfying the Mcwhirter Criterionsupporting
confidence: 86%
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“…Due to the strong ionic radiation and continuous background radiation at the earlier stage of LIP, the spectral intensity of the atomic line cannot be accurately obtained, and thus only the LIP in the middle and later times is analyzed: the delay time T d is from 300 ns to 3500 ns at 10 3 Pa, the delay time T d is from 400 ns to 6000 ns at 10 4 Pa, and the delay time T d is from 600 ns to 6000 ns at 10 5 Pa. One can see from figure 6(a) that the minimum electron density n e decreases against the delay time T d and is greater than the electron density n e obtained in the experiment within the measurement time when the air pressure is 10 3 Pa; this means that LIP in the present study at 10 3 Pa does not meet the McWhirter criterion when the delay time T d is from 300 ns to 3500 ns, and it has deviated from LTE. In our previous work [16], we also studied the time points at which the LIP deviated from LTE using the coefficient v; the results show that the time point is closer to the moment of the pulsed laser energy peak in a lower ambient pressure environment, which can be verified with the conclusion of the present work. At evaluate the LTE of LIP are the cumulative spectra obtained from r = −4 mm to r = 4 mm; the LIP core has stronger radiation, higher electron temperature, higher electron density, and longer LTE duration; therefore, the time point at which the LIP did not satisfy the McWhirter criterion in the previous work is later than that in the present work.…”
Section: Radial Distribution Of Lip Satisfying the Mcwhirter Criterionsupporting
confidence: 86%
“…In summary, air pressure can significantly affect the temporal evolution of LIP's radial distribution. In addition, the moment at which the LIP starts to not meet the McWhirter criterion with the increases in the delay time T d in a higher-pressure environment occurs later, which means that the lifetime of the LIP satisfying the McWhirter criterion is longer in a higher-pressure environment.In our previous work[16], we also studied the time points at which the LIP deviated from LTE using the coefficient v; the results show that the time point is closer to the moment of the pulsed laser energy peak in a lower ambient pressure environment, which can be verified with the conclusion of the present work. At10 5 Pa, the LIP starts to deviate from LTE and meets the McWhirter criterion at 1500 ns in both works.…”
supporting
confidence: 85%
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“…The above mechanism studies provide a theoretical basis for the accurate acquisition of LIBS spectral data. For example, Ke et al [98] used this criterion to optimize the acquisition time of LIBS signals under different background air pressures, which significantly increased the accuracy of quantitative LIBS under different air pressure conditions.…”
Section: Spectral Data Acquisition Based On Libs Mechanismmentioning
confidence: 99%