Influence of the thermodynamic equilibrium state in the excitation of samples by a plasma at atmospheric pressure

Abstract

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Time resolved optical emission spectroscopy in power modulated atmospheric pressure plasma jet

“…3 and was calculated from the time-resolved and multiply accumulated intensities of selected Ar I lines, Table 1. This particular selection have been used also by other investigators [20,24]. For 80 Hz AM, the T exc is in the range 3600 -4000 K, with statistical error ± 250 K. This is nearly the same as measured for pure argon plasma in [16].…”

“…The gas temperature is usually estimated from rotational temperature of some molecular species present in the discharge such as OH [24,[29][30][31][32], N 2 + [33,34], CN [35] or C 2 [36] on account of the highly favourable energy exchange between heavy particles and the internal rotationalvibrational states of the molecular species involved [37]. Assuming that admixture molecules are in equilibrium with the gas atoms majority, the rotational temperature (T rot ) derived from the ro-vibrational spectra can be considered equal to the gas temperature (T gas ) [28].…”

Parametric study on excitation temperature and electron temperature in low pressure plasmas

“…The relationship between T exc and T e has been investigated over the past few decades, and the resulting studies reported the comparisons performed in microwave discharge [2,3,9], plasma jet [10], or theoretically [11] at atmospheric pressure. However, few studies have been attempted in high electron density at low pressure plasmas such as industrial processing plasmas in which various plasma sources are needed for advanced technology.…”

Rapid surface treatment of polyamide 12 by microwave plasma jet

“…Therefore, the excitation temperature (T exc ) derived from the Boltzmann plot is often considered equal to the electron temperature [33,37,38]. From the time-resolved and multiply accumulated intensities of the selected lines (this particular selection have been used also by other investigators [34, 37,39]) the relevant temperatures using a simple Boltzmann plot technique [40] was calculated, see figure 9. The excitation temperature calculated from these Ar I emission lines is for 80 Hz in the range (3400-4100) K and it follows the sinusoidal AM envelope very well.…”