Temporal Profiles of Atomic Emissions in High-Repetition-Rate Laser-Ablation Spark-Induced Breakdown Spectroscopy

Fig. 2. Temporal profiles of the discharge currents observed using different capacitors in the discharge circuit (the wave forms are shifted in order to show more clearly, but the scale of the relative intensity for four waveforms is the same; the dash-dotted lines represent the zero position of each curve)

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Fig. 3. Plasma emission spectra recorded with a fiber spectrometer

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Fig. 4. Observed temporal profile of plasma emission at 328.07 nm, the wavelength corresponding to the atomic emission of Ag I 328.07 nm (T_SD is the time when spark discharge is stopped and T_p is the time when plasma emission is disappeared)

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Fig. 5. Observed temporal profiles of silver and copper atoms observed at different wavelengths

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Fig. 6. Time-resolved detection of an exponentially decay signal

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Table 1. Period of oscillation and persistence time of the discharge currents at different capacitance values
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Table 1. Period of oscillation and persistence time of the discharge currents at different capacitance values
Capacitance /nF Period ofoscillation /μs Persistencetime /μs
2 0.54 2.7
5 0.91 3.6
10 1.35 4.9
20 2.04 6.8

Table 2. List of transition parameters of the observed lines

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Table 2. List of transition parameters of the observed lines

Line	A_ki /s^-1	E_i /cm^-1	E_k /cm^-1
Ag I 328.07 nm	1.4×10⁸	0	30472.67
Ag I 338.29 nm	1.3×10⁸	0	29552.06
Ag I 520.91 nm	7.5×10⁷	29552.06	48743.97
Ag I 546.55 nm	8.6×10⁷	30472.67	48764.22
Cu I 324.75 nm	1.4×10⁸	0	30783.70
Cu I 510.55 nm	2.0×10⁶	11202.62	30783.70

Table 3. List of persistence time of the atomic emission and lifetime of the decayed plasma emission after ceasing of the spark discharge for different atomic transitions

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Table 3. List of persistence time of the atomic emission and lifetime of the decayed plasma emission after ceasing of the spark discharge for different atomic transitions

Line	T_P /μs	T_free /μs	E_k /cm^-1
Ag I 328.07 nm	17.5	3.57	30472.67
Ag I 338.29 nm	17.5	3.72	29552.06
Ag I 520.91 nm	17.4	2.88	48743.97
Ag I 546.55 nm	17.4	2.87	48764.22
Cu I 324.75 nm	17.5	3.18	30783.70
Cu I 510.55 nm	17.5	3.23	30783.70

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Cao Yu, Kang Juan, Chen Yuqi, Li Runhua. Temporal Profiles of Atomic Emissions in High-Repetition-Rate Laser-Ablation Spark-Induced Breakdown Spectroscopy[J]. Chinese Journal of Lasers, 2020, 47(6): 611002

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Paper Information

Category: spectroscopy

Received: Dec. 25, 2019

Accepted: --

Published Online: Jun. 3, 2020

The Author Email: Runhua Li (rhli@scut.edu.cn)

DOI:10.3788/CJL202047.0611002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Period of oscillation and persistence time of the discharge currents at different capacitance values

Table 1. Period of oscillation and persistence time of the discharge currents at different capacitance values

Table 2. List of transition parameters of the observed lines

Table 2. List of transition parameters of the observed lines

Table 3. List of persistence time of the atomic emission and lifetime of the decayed plasma emission after ceasing of the spark discharge for different atomic transitions

Table 3. List of persistence time of the atomic emission and lifetime of the decayed plasma emission after ceasing of the spark discharge for different atomic transitions