Using Fundamental Spectroscopy to Elucidate Kinetic and Energetic Mechanisms within Environmentally Relevant Inductively Coupled Plasma Systems

作者：Hanna Angela R; Blechle Joshua M; Fisher Ellen R^*

来源：Journal of Physical Chemistry A, 2017, 121(40): 7627-7640.

DOI：10.1021/acs.jpca.7b05311

Understanding energy distributions and kinetic processes in NxOy plasma systems is vital to realizing their potential in a range of applications, including pollution abatement. Energy partitioning between degrees of freedom and multiple molecules formed within. NxOy plasma systems (N-2, N2O, N-2/O-2) was investigated using both optical emission and broadband absorption spectroscopies. Specifically, we determined electron temperatures (T-e) as well as rotational (T-R) and vibrational (T-v) temperatures for various N-2 (B-3 Pi g and C-3 Pi(u)) and NO (X-2 Pi and A(2)Sigma(+)) states. T-R and T-v for both molecules (regardless of state) show a strong positive correlation with applied plasma power, as well as a negative correlation with system pressure. In all cases, T-v-values are significantly higher than T-R for both species, suggesting vibrational modes are preferentially excited over rotational degrees of freedom. Time resolved optical emission spectroscopy was utilized to;determine rate constants, providing mechanistic insight and establishing the relationships between system parameters and plasma chemistry. Ultimately, the combination of these data allows us to glean information regarding both the kinetics and energetics of N-2 and NO molecules formed within nitrogen- and oxygen-containing-plasma systems for potential applications in gas remediation of pollutants.

• 出版日期2017-10-12