High-Resolution Vibrational Spectra of Furazan IV. The Aj Fundamental v2 at ~ 1418 cm-1 from Fourier-Transform Infrared Spectroscopy

1993 ◽  
Vol 48 (5-6) ◽  
pp. 692-698
Author(s):  
Otto L. Stiefvater ◽  
Stefan Klee
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Excited State ◽  
High Resolution ◽  
Band Origin ◽  
Asymmetric Rotor ◽  
Stretching Vibration ◽  
Ft Ir ◽  
Microwave Data

Abstract The band origin of the A1 mode v2 , which represents the symmetrical stretching vibration of the two C = N bonds of furazan, has been determined from the high-resolution FT-IR band as v20 = 1418.4724± 0.0001 cm-1. The rotational parameters of this excited state, as determined in a preceding DRM microwave study, have been confirmed and their precision was raised through the combined fit of microwave data and of some 2500 rovibrational transitions.The use of conjugate low-J Q-branch lines for the determination of the origin of a B-type IR band of an asymmetric rotor is illustrated.

High-Resolution Vibrational Spectra of Furazan II. The B1 Fundamental ν 11 at ~ 1175 cm–1 from Fourier-Transform Infrared Spectroscopy

1992 ◽  
Vol 47 (3) ◽  
pp. 499-506 ◽  
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
High Resolution ◽  
Vibrational Spectra ◽  
Ir Spectrum ◽  
Microwave Spectroscopy ◽  
Statistical Uncertainty ◽  
Band Origin ◽  
Combined Use ◽  
Ft Ir

Abstract The high-resolution FT-IR spectrum of the A-type fundamental ν11 of furazan ( C2H2N20) has been recorded and analysed against the background of rotational information from DRM microwave spectroscopy to yield the band origin as ν110= 1175.3377 + 0.0001 cm-1 . The combined use of microwave (MW) and FT-IR data gives this band origin with a statistical uncertainty of σ= 10-6cm-1 and leads to a refinement of the rotational constants of the state ν11 = 1 over those derivable from either MW or FT-IR data alone

scholarly journals High-Resolution Infrared Spectroscopy of the v1+ v4Band of14NF3:Reductions of the Rovibrational Hamiltonian

2012 ◽  
Vol 9 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Hamid Najib ◽  
Siham Hmimou ◽  
Hicham Msahal
Keyword(s):  
Experimental Data ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Excited State ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Sixth Order ◽  
Degenerate State ◽  
Unitary Equivalence

The high-resolution Fourier transform infrared spectrum of nitrogen trifluoride NF3has been studied in the v1+ v4perpendicular band region around 1523 cm−1. All experimental data have been refined applying various reduction forms of the effective rovibrational Hamiltonian developed for an isolated degenerate state of a symmetric top molecule. The v1= v4= 1 excited state of the14NF3oblate molecule was treated with models taking into account ℓ- andk-type intravibrational resonances. Parameters up to sixth order have been accurately determined and the unitary equivalence of the derived parameter sets in different reductions was demonstrated.

scholarly journals A Low-Cost Salt Plate Holder for Micro FT-1R

1999 ◽  
Vol 7 (8) ◽  
pp. 28-28
Author(s):  
James Benko
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Low Cost ◽  
Potassium Bromide ◽  
Single Particles ◽  
Small Particles ◽  
Instrumental Technique ◽  
Salt Crystals ◽  
Ft Ir

FT-IR (Fourier Transform Infrared) spectroscopy is an instrumental technique for measuring the infrared spectrum of materials. Many organic compounds have characteristic spectra that can be used for their identification, and specific functional groups (hydroxyl, carbonyl. amine, etc.) have characteristic bands at certain frequencies.Microscopes have been coupled to FT-IR instruments and allow the IR spectrum determination of single particles. This greatly increases the identification possibilities of small particles and contaminants. These particles can be mounted on sodium chloride or potassium bromide salt crystals, since these materials are transparent to infrared radiation.

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