本文選題：LIBS + 自吸收��； 參考：《光譜學(xué)與光譜分析》2016年04期

【摘要】：應(yīng)用Nd∶YAG脈沖激光器(532nm)作為光源,誘導(dǎo)激發(fā)TU0Cu樣品。以光柵光譜儀和ICCD為譜線分離與探測器件,在30~110mJ激光能量范圍和觸發(fā)后211~230μs時間范圍內(nèi)對Cu(Ⅰ)特征譜線324.754,327.396,510.554,515.324和521.320nm的自吸收特性進(jìn)行比較研究。研究表明,特征譜線自吸現(xiàn)象隨時間增加逐漸減弱,經(jīng)過5~20μs逐步消失;在50~100mJ能量范圍內(nèi),隨著激光能量的增大,譜線的自吸收程度增加,持續(xù)時間變長。同時特征譜線的自吸收特性因譜線躍遷能級狀態(tài)不同而存在差異,具有相同原子組態(tài)的324.754,327.396nm和515.324,521.320nm兩組譜線的自吸收程度隨時間和激光能量的演變以及自吸持續(xù)時間隨能量的變化都分別表現(xiàn)出相似的特征,且總角動量J較大(324.754nm,1/2-3/2;521.320nm,3/2-5/2)的譜線自吸收程度相對明顯,持續(xù)時間較長,受能量變化影響敏感,自吸收程度隨能量變化幅度也較大。譜線510.554nm(3d~(10)4p-3d~94s~2)在能量小于80mJ時自吸程度較低,持續(xù)時間較短;能量在80~100mJ范圍內(nèi)時自吸程度加大,持續(xù)時間變長。
[Abstract]:ND: YAG pulsed laser (532nm) was used as a light source to excite the TU0Cu sample. With grating spectrometer and ICCD as spectral line separation and detector, the self-absorption characteristics of Cu (I) characteristic line 324.754327.396510.554515.324 and 521.320nm are compared in the energy range of 30g 110mJ laser and 211230 渭 s after trigger. The results show that the self-absorption of the characteristic lines decreases with time, and disappears gradually after 50 渭 s, and in the energy range of 50 ~ 100mJ, the self-absorption degree increases and the duration becomes longer with the increase of laser energy. At the same time, the self-absorption characteristics of the characteristic lines are different due to the different transition energy levels of the spectral lines. The self-absorption degree of 324.754327.396nm and 515.324521.320nm lines with the same atomic configuration shows similar characteristics with the evolution of time and laser energy, and the self-absorption duration with energy, respectively. Moreover, the total angular momentum J is larger (324.754 nmg ~ (-1 / 2 / 2) / 521.320nmN ~ (2 / 2). The self-absorption degree of the spectrum line is relatively obvious, the duration is longer, and it is sensitive to the change of energy, and the degree of self-absorption is also larger with the change of energy. The spectral line 510.554nm (3d10 4p-3d~94s~2) has a lower degree of self-priming and a shorter duration when the energy is less than 80mJ, and when the energy is in the range of 80mJ, the self-priming degree increases and the duration becomes longer.
【作者單位】： 沈陽理工大學(xué)理學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(61378042)資助
【分類號】：TN249;O433

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