High-Resolution Vibrational Spectra of Furazan III. The A1 Fundamentals v3 at ~ 1316 cm-1 and v4 at ~ 1036 cm-1 from Fourier-Transform Infrared Spectroscopy

Abstract With prior information on vibrationally excited states from DRM microwave spectroscopy, two B-type high-resolution FT-IR bands of furazan were examined to yield the band origins v03 = 1316.2254 cm-1 and v04 = 1036.1689 cm-1 with an estimated absolute uncertainty of ±0.0001 cm-1 . The rotational and distortion constants of both fundamental states were refined by the combination of rotational with rovibrational data in the least-squares fits of the bands.

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

Zeitschrift für Naturforschung A ◽

10.1515/zna-1992-0310 ◽

1992 ◽

Vol 47 (3) ◽

pp. 499-506 ◽

Cited By ~ 5

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

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High-Resolution Vibrational Spectra of Furazan

Zeitschrift für Naturforschung A ◽

10.1515/zna-1991-1002 ◽

1991 ◽

Vol 46 (10) ◽

pp. 841-850

Author(s):

Otto L. Stiefvater

Keyword(s):

Excited States ◽

Ground State ◽

Double Resonance ◽

Microwave Spectroscopy ◽

Statistical Uncertainty ◽

Molecular Constants ◽

Vibrationally Excited ◽

Vibrational Ground State ◽

Vibrational Bands ◽

Ft Ir

AbstractThe study by Fourier transform (FT) infrared (IR) spectroscopy of the fundamental vibrational bands v12 and v5 of furazan yields the origins of these bands with a statistical uncertainty of 10-6 cm-1, which leads to an estimated absolute uncertainty of 10-4 cm-1. The values are v°12 = 952.6123 cm -1 and v°5 = 1.005.3536 cm -1. They confirm the values previously deduced from laser/microwave double resonance (LMDR) experiments. Previous results for the molecular constants of the vibrational ground state and of the two vibrationally excited states, as obtained by double resonance modulation (DRM) microwave spectroscopy alone, are confirmed and refined. Advantages brought about through the combination of the DRM microwave and the FT-IR technique are outlined.

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Vibrationally excited states in a pulsed jet observed by Fourier transform microwave spectroscopy

Chemical Physics Letters ◽

10.1016/s0009-2614(99)00611-9 ◽

1999 ◽

Vol 308 (5-6) ◽

pp. 355-362 ◽

Cited By ~ 22

Author(s):

Martin Schäfer ◽

Alfred Bauder

Keyword(s):

Fourier Transform ◽

Excited States ◽

Microwave Spectroscopy ◽

Vibrationally Excited ◽

Pulsed Jet ◽

Fourier Transform Microwave Spectroscopy

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

Zeitschrift für Naturforschung A ◽

10.1515/zna-1993-5-619 ◽

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.

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