In order to obtain the aluminum resonant double lines, Al I 396.15 nm and Al I 394.40 nm, we have recorded the time-resolved spectra of the plasma induced by Nd:YAG laser ablating metal aluminum in Ar, under the Ar ambient pressure 10 kPa, at 0.1 mm in front of the target, with laser pulse energy 145 mJ/pulse. Relative intensities of the double lines were acquired by integrating the area under the double lines, respectively. According to the ratio of the intensities of the double lines, the ratio of transition probability of the double lines was deduced, and contrasted with the theoretical value. As the result, we found they tally with each other exactly. Limited to our experimental condition, we could only estimate approximately the ratio of transition probability of the double lines. Further experiments were needed for precise measurements of respective transition probability of the double lines.
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