High-resolution infrared and microwave spectroscopy of the ν4 and 2ν2 bands of 14NH3 and 15NH3

Hiroyuki Sasada, Yasuo Hasegawa, Takayoshi Amano, Tadao Shimizu

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

More than two thousand Stark resonances of the ν4 and 2ν2 band transitions of 14NH3 and 15NH3 were observed at Doppler-limited resolution with a CO laser. Fourier transform infrared spectroscopy on 15NH3 is also carried out. Thirty-six new microwave transitions including seven perturbation-enhanced transitions are observed in the v4 = 1 excited vibrational state of 14NH3 and 15NH3. Accuracies of all available spectroscopic data on the v4 = 1 and the v2 = 2 states are evaluated and analyses of the vibration-rotation spectra are performed. The Coriolis interaction between the closely lying v4 = 1 a (antisymmetric level) and v2 = 2 s (symmetric level) states is explicitly included in the analysis. Smaller Coriolis interactions between the v4 = 1 a and the v2 = 1 s states and between the v2 = 2 s and the v2 = v4 = 1 a states (i.e., (v1, v2, v′3, v′4) = (0 1 00 11)) are also taken into consideration. The accuracy in determination of the principal molecular constants is 10-6. The parameters thus obtained reproduce the frequencies of the vibration-rotation transitions and inversion transitions within the accuracy of 0.0024 cm-1.

Original languageEnglish
Pages (from-to)106-130
Number of pages25
JournalJournal of Molecular Spectroscopy
Volume96
Issue number1
DOIs
Publication statusPublished - 1982
Externally publishedYes

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Microwave spectroscopy
Infrared spectroscopy
infrared spectroscopy
microwaves
high resolution
Carbon Monoxide
spectroscopy
Microwaves
Lasers
vibration
vibrational states
interactions
inversions
perturbation
lasers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

High-resolution infrared and microwave spectroscopy of the ν4 and 2ν2 bands of 14NH3 and 15NH3. / Sasada, Hiroyuki; Hasegawa, Yasuo; Amano, Takayoshi; Shimizu, Tadao.

In: Journal of Molecular Spectroscopy, Vol. 96, No. 1, 1982, p. 106-130.

Research output: Contribution to journalArticle

Sasada, Hiroyuki ; Hasegawa, Yasuo ; Amano, Takayoshi ; Shimizu, Tadao. / High-resolution infrared and microwave spectroscopy of the ν4 and 2ν2 bands of 14NH3 and 15NH3. In: Journal of Molecular Spectroscopy. 1982 ; Vol. 96, No. 1. pp. 106-130.
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