Time resolved plasma photoemission of myocardium with excimer laser excitation

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Abstract
Time resolved emission spectra of myocardium irradiated with 193- and 308-nm excimer laser radiation were recorded as a function of laser fluence. The laser fluence impinging on the sample varied from 0.48 to 2.0 J/cm2. It was found that the recorded emission spectra depend greatly on the incident laser fluence and time delay. At a laser fluence of 2.0 J/cm2 and short delay, the emission spectra are dominated by nitrogen ion emission lines. At longer delays and lower laser fluences C2 and CN radical emission spectra are recorded. The sequence in which the emission from these species is seen, as a function of laser fluence and time delay, suggests that at high fluence a plasma is formed in the plume above the ablation site and that excited-state nitrogen species may play an important role in the generation of radical fragments commonly seen in the laser induced plasma emission of organic materials. It is not clear to what extent these fragments may be generated as direct ablation products.