Radial characteristics of laser-induced plasma under the influence of air pressure

Yuan, Huan; Ke, Wei; Liu, J. Q.; Chen, M. Y.; Wang, X. H.; Yang, Aijun; Chu, Jen-Fei; Liu, Dingxin; Rong, Mingzhe

doi:10.1088/1361-6463/ace197

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…This can be explained as follows: according to the ideal gas equation, the particle number densities of air at 10 −1 Pa and 10 −3 Pa are about 10 13 cm −3 and 10 11 cm −3 , respectively. These values are much lower than the electron density measured in experiment [26][27][28]. Therefore, when the air pressure is below 10 −1 Pa, the variation of air pressure has minimal impact on plasma.…”

Section: Analysis Of Resultsmentioning

confidence: 64%

“…This is because the laser energy in this experiment is sufficiently high, the laser energy density is 22.92 J cm −2 to 68.75 J cm −2 , and when the air pressure is 10 3 Pa, the radiation generated by plasma is intense, equivalent to that at 10 5 Pa. According to the ideal gas equation, the number density of air is about 10 15 cm −3 at an air pressure of 10 Pa, and it is about 10 11 cm −3 at 10 −3 Pa, which is much lower than the electron density observed in previous works [26][27][28]. Therefore, when the air pressure is below 10 Pa, the influence of ambient air on plasma is minimal, resulting in little or no significant change in spectral intensity of the target atom when the air pressure decreases.…”

Section: Spectral Measurement Results From Atoms Cu and Hmentioning

confidence: 71%

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Effect of laser energy on temporal evolution of self-absorption at different air pressures

Ke,

Yuan,

Liu

et al. 2023

J. Phys. D: Appl. Phys.

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The self-absorption effect is one of the key factors influencing the accuracy of quantitative analysis. Laser energy is the key influencing factor of laser-induced breakdown spectroscopy (LIBS), and the mechanism of its influence on temporal evolution of self-absorption under different air pressures is still not fully understood due to complex physical processes. In this study, the temporally resolved spectra of Cu I 521.82 nm were acquired from the direction of laser incidence and the influence of laser energy on the temporal evolution of self-absorption in a low-vacuum (at pressures of 105, 104 and 103Pa) and high-vacuum (at pressures of 10, 10−1 and 10−3Pa) environment was studied. The experimental results indicate that the self-absorption effect of spectral line Cu I 521.82 nm is enhanced with an increase in delay time and laser energy in both high-vacuum and low-vacuum environments in this study. This is because increasing the delay time and laser energy leads to an increase in plasma column density. An intriguing phenomenon observed in this experiment is that at a pressure of 105Pa, the self-absorption of Cu I 521.82 nm initially increases but eventually weakens with laser energy, while at air pressures of 104Pa and 103Pa the self-absorption monotonically weakens with increasing laser energy during the measurement. This is because temporal evolution of plasma at 104Pa and 103Pa is significantly faster than that at 105Pa, and an increase in laser energy can delay the enhancement of self-absorption, the self-absorption has rapidly evolved to decrease with laser energy during spectral measurement at air pressure of 104 Pa and 103 Pa. This work is helpful in understanding the influence of air pressure and laser energy on the self-absorption effect of spectral lines and optimizing experimental parameters, and provides a reference for LIBS application.

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Section: Analysis Of Resultsmentioning

confidence: 64%

Section: Spectral Measurement Results From Atoms Cu and Hmentioning

confidence: 71%