Effect of vibrationally excited molecules on radical generation

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H04864
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Plasma science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Teramoto Yoshiyuki 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (00635328)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: プラズマ / レーザー計測 / ラジカル / 振動温度

Outline of Final Research Achievements

Herein, we report on experimental results showing that vibrationally excited N2(v) plays an important role in producing nitrogen atoms in successive two-pulsed corona discharges. To investigate the effect of vibrationally excited N2(v) on the generation of atomic nitrogen, two pulses were generated such that their pulse intervals could be varied in a controlled manner. The resulting nitrogen atoms were measured using TALIF under atmospheric pressure N2 at different time points after each pulse. The results indicate the energy efficiency of atomic nitrogen generation in the second pulse discharge near the anode tip was a maximum of approximately 3 times that of the first pulse. Moreover, it indicates that the main generation region of atomic nitrogen in the second pulse discharge is different from that of the first pulse, although the second pulse discharge use vibrationally excited N2(v) to generate atomic nitrogen.

Free Research Field

大気圧プラズマ

Academic Significance and Societal Importance of the Research Achievements

大気圧非熱平衡プラズマ中ラジカル種はその高い反応性から、幅広いプロセスで応用研究されている。一方でプラズマへ投入されたエネルギーの約70％が分子振動励起に消費されており、多くの投入エネルギーが最終的に熱に転換されている。本研究ではこの振動励起分子に蓄えられたエネルギーに着目し、それを活用することで主要ラジカルの生成効率向上を目指ことで、大気圧プラズマ技術の幅広い分野の発展に貢献するものである。