Terahertz Measurements of Rotational Transitions in Vibrationally Excited States of N2O

We have measured and analyzed rotational transitions of N2O in the following vibrational states, 011e,f0, 020,2e,f0, 031,3e,f0, 0001, 011e,f1, and 1000. The NAIR terahertz spectrometer was used to measure the frequencies of transitions in the range J = 25 ← 24 to J = 31 ← 30 with accuracies of ±0.02...

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Published in:Journal of molecular spectroscopy 1999-07, Vol.196 (1), p.131-138
Main Authors: Morino, I., Yamada, K.M.T., Maki, A.G.
Format: Article
Language:English
Subjects:
calibration
Fermi resonance
millimeter-wave spectra
molecular spectra
N2O
rotational spectrum
rovibrational constants
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description We have measured and analyzed rotational transitions of N2O in the following vibrational states, 011e,f0, 020,2e,f0, 031,3e,f0, 0001, 011e,f1, and 1000. The NAIR terahertz spectrometer was used to measure the frequencies of transitions in the range J = 25 ← 24 to J = 31 ← 30 with accuracies of ±0.020 MHz in most cases. These measurements were fit, along with other microwave and infrared measurements involving the same states, to obtain improved rovibrational term values for those vibrational states. It is shown that the measurements can be fit with fewer constants if both l-type resonance and the Fermi resonance among the levels 0001 and 020,20 or 0111 and 031,30 are included in the least-squares fit. These measurements also contribute to improving the N2O wavenumber calibration standards for the infrared region.
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subjects calibration
Fermi resonance
millimeter-wave spectra
molecular spectra
N2O
rotational spectrum
rovibrational constants
title Terahertz Measurements of Rotational Transitions in Vibrationally Excited States of N2O
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