An electrosurgical argon plasma with a 5% admixture of molecular hydrogen is studied in order to investigate time averaged plasma parameters by optical emission spectroscopy (OES). Electron densities in the range of 10¹⁵–10¹⁶cm⁻³ are determined from the Stark broadening of the time averaged line profiles of the Balmer-α and -β emission lines of hydrogen. A two-profile fit corresponding to regions of different electron densities is found to provide a better representation of the line broadening than a single profile fit. This is consistent with time resolved ICCD imaging, acquired with 150ns time resolution, that shows strong radial gradients in the plasma emission and the asymmetry produced by the discharge arrangement. Gas temperatures are determined using two different methods. Firstly, simulated spectra for different rotational temperatures are fitted to the measured N₂(C-B, 0-1) emission band originating from ambient air diffusion into the argon/hydrogen gas flow. From the best fit, rotational temperatures between 1500K and 1800K are inferred. These measurements are in good agreement with those inferred by the second method, which is based on the collisional broadening of the emission lines of neutral argon at 750nm and 751nm. This latter method may be useful for the measurement of gas temperatures when the device is used inside hollow organs during endoscopic or laparoscopic interventions, where air mixing will be limited. Therefore, the results of this study are highly relevant to applications of these devices, e.g. for controlling tissue effects and the avoidance of excessive heating.

为了研究通过光发射光谱法（OES）进行时间平均的等离子体参数，研究了具有5％氢分子氢混合物的电外科氩等离子体。电子密度在10 ¹⁵ –10 ¹⁶ cm ^-3的范围内由Balmer- α和-β的时间平均线轮廓的Stark展宽确定氢发射线。发现对应于不同电子密度区域的两轮廓拟合比单轮廓拟合能更好地表示谱线加宽。这与以150ns的时间分辨率采集的时间分辨的ICCD成像是一致的，该成像显示了等离子体发射中的强径向梯度以及由放电装置产生的不对称性。使用两种不同的方法确定气体温度。首先，将不同旋转温度下的模拟光谱拟合到测得的N ₂（CB，0-1）发射带源自周围空气扩散到氩气/氢气流中。根据最佳拟合，可以推断出1500K和1800K之间的旋转温度。这些测量结果与第二种方法推断的结果非常吻合，第二种方法基于中性氩在750nm和751nm处发射线的碰撞加宽。当在限制空气混合的内窥镜或腹腔镜介入手术期间将器械用于中空器官内部时，后一种方法可能对测量气体温度有用。因此，这项研究的结果与这些设备的应用高度相关，例如，用于控制组织效果和避免过度加热。