Untangling the Herman-infrared spectra of nitrogen atmospheric-pressure dielectricbarrier discharge

0490933 - ÚFCH JH 2019 RIV GB eng J - Journal Article
Čermák, P. - Annušová, A. - Rakovský, Jozef - Martišovitš, V. - Veis, P.
Untangling the Herman-infrared spectra of nitrogen atmospheric-pressure dielectricbarrier discharge.
Plasma Sources Science & Technology. Roč. 27, č. 5 (2018), č. článku 055009. ISSN 0963-0252. E-ISSN 1361-6595
Institutional support: RVO:61388955
Keywords : NO gamma * second positive system * Herman-infrared system * first positive system * dielectric-barrier discharge * rotational temperature fit
OECD category: Physical chemistry
Impact factor: 4.128, year: 2018

This study presents the first application of the N-2 Herman-infrared (HIR) ro-vibrational model for the metrology of the atmospheric-pressure dielectric-barrier discharge. Our recent findings of suitable conditions for observation of the unperturbed HIR system (Annusova et al Contrib. Plasma Phys. 2017) gave us the opportunity to develop and test a numerical representation of this complex system composed of 75 branches. Commonly, the HIR covers a part of the near infrared spectra (690-850 nm) with its bands mixed with the N-2 first positive system (IPS), which hinders applications of these systems for optical metrology of the discharge. In this work, we present a complex ro-vibrational model of the IPS and HIR systems, which allowed us to untangle their spectra and retrieve the rotational temperature and vibrational populations of the systems for the first time. The latter was achieved by coupling the PGHOPHER simulation package with molecular constants obtained from high-resolution experiments. To test the model, the results and precision were compared to the retrievals based on the models of the NO gamma and N-2 second positive systems using the LIFBASE and SPECAIR programs, respectively.
Permanent Link: http://hdl.handle.net/11104/0285042