FTIR spectroscopy of NO3: Perturbation analysis of the ν34 state

Kentarou Kawaguchi, Ryuji Fujimori, Jian Tang, Takashi Ishiwata

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19 Citations (Scopus)


High-resolution Fourier transform infrared spectra of the 15NO3 ν34 and ν344 bands were observed in the 1472 and 1112 cm-1 regions. Compared with the case of 14N species, large effects of perturbations were recognized in many rotational levels of the 15NO3 ν34 state, and it was found that the ν2+2ν4 state is responsible for the perturbation. Although a direct Coriolis interaction (Δν2 = 1, Δν3(or Δν 4)=1) is not present between these two vibrational levels, anharmonic terms including Φ344 and Φ444 mix ν34 and 3ν4, ν2+2ν 4, and ν2+2ν4 mixes with ν24 to produce Coriolis interaction between ν34 and ν2+2ν4. An analysis gave the energy difference of 7.274 cm-1 between two levels, and interaction parameters were determined. Similar perturbation analysis was applied for the 14N species, and the previous pP(N,K) assignment of the ν34 A′-ν4 E′ band was changed for giving one A2′ state. Spectral lines to another A1′ state were not assigned because of weak intensity, which is explained by intensity anomaly through vibronic interaction, reflecting the transition moment of the B̃2E′- X̃2A2′ electronic band.

Original languageEnglish
Pages (from-to)13732-13742
Number of pages11
JournalJournal of Physical Chemistry A
Issue number50
Publication statusPublished - Dec 19 2013

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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