Herein, a pulsed electrolyte cathode atmospheric pressure discharge (pulsed-ECAD) system was developed as a radiation source for the atomic emission spectroscope (AES) for metal element determination in aqueous solutions. The time-resolved emission spectra of the pulsed-ECAD were obtained at various frequencies, and their evolution behaviours during the modulation period were found to exhibit a strong dependence on the modulation frequency. The temporal behaviors of the metal element spectral intensities of K, Na, Li, Rb, Sr, and Mg as well as the atomic and molecular species emissions originating from water and air (OH, H_α, H_β, N₂, and O) were characterized from the plasma. The temporal evolutions of the pulsed-ECAD plasma parameters, including the rotational temperature, electron density, and ionization temperature, were analyzed. The results showed that the rotational temperatures varied between 950 K and 1350 K. The electron density and ionization temperature ranges of Mg were from 4.3 × 10¹⁴ to 2.2 × 10¹⁵ cm⁻¹ and from 5200 K to 5500 K, respectively.

中文翻译：

---

脉冲电解质阴极大气压放电系统的时间分辨发射光谱和等离子体特性

本文中，开发了脉冲电解质阴极大气压放电（pulsed-ECAD）系统作为原子发射光谱仪（AES）的辐射源，用于测定水溶液中的金属元素。在各种频率下获得了脉冲ECAD的时间分辨发射光谱，发现它们在调制期间的演化行为对调制频率具有很强的依赖性。金属元素光谱强度K，Na，Li，Rb，Sr和Mg的时间行为以及源自水和空气（OH，_Hα，_Hβ，N ₂的原子和分子物质的排放），和O）由等离子体表征。分析了脉冲ECAD等离子体参数的时间演变，包括旋转温度，电子密度和电离温度。结果表明，旋转温度在950 K和1350 K之间变化。Mg的电子密度和电离温度范围分别为4.3×10 ¹⁴至2.2×10 ¹⁵ cm ^-1和5200 K至5500K。