Microwave spectroscopy of furfural in vibrationally excited states

2007 ◽  
Vol 244 (1) ◽  
pp. 9-12 ◽  
Author(s):  
R.A. Motiyenko ◽  
E.A. Alekseev ◽  
S.F. Dyubko
Keyword(s):  
Excited States ◽  
Microwave Spectroscopy ◽  
Vibrationally Excited

Preferred Rotameric Conformations of Isobutyraldehyde, Their Dipole Moments and Vibrationally Excited States by Microwave Spectroscopy

1986 ◽  
Vol 41 (3) ◽  
pp. 483-490 ◽  
Author(s):  
O. L. Stiefvater
Keyword(s):  
Oxygen Atom ◽  
Excited States ◽  
Ground State ◽  
Dipole Moments ◽  
Microwave Spectroscopy ◽  
Centrifugal Distortion ◽  
Gauche Conformation ◽  
Vibrationally Excited ◽  
Trans Conformation ◽  
Centrifugal Distortion Constants

The earlier prediction of the preferred and the less stable rotameric conformations of isobutyraldehyde, (CH3)2CHCHO, has been confirmed experimentally by microwave spectroscopy. The compound exists mainly in a gauche conformation, in which one of the methyl groups is eclipsed by the oxygen atom, and the less stable rotamer is the trans conformation, in which the oxygen atom eclipses the isopropyl hydrogen.Ground state rotational constants (in MHz) and centrifugal distortion constants (in kHz), together with dipole moments (in D), are:Rotation spectra due to three torsionally excited states of each rotamer have been identified, along with satellites arising from CH3 internal rotation and CC2 wagging.

scholarly journals Microwave Spectra of Furazan. III. Rotation Spectra of Vibrationally Excited States

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1117-1130
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Excited States ◽  
Heterocyclic Compound ◽  
Microwave Spectroscopy ◽  
Vibrational Modes ◽  
Vibrationally Excited ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
Microwave Spectra

Abstract The pure rotational spectra of molecules in 21 vibrationally excited states of the heterocyclic compound furazan (C2H2N2O) have been detected and studied by DRM microwave spectroscopy. Rotational parameters are reported for the 12 fundamental levels below 1500 cm-1 , and the contri-butions from 10 vibrational modes to the effective rotational constants and to the inertia defect of furazan are calculated.

High-Resolution Vibrational Spectra of Furazan

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.

Microwave Spectra of Furazan. IV. Rotation Spectra of Vibrationally Excited States of Perdeuterated Furazan

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1131-1143
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Ir Spectroscopy ◽  
Excited States ◽  
Relative Intensity ◽  
Ground State ◽  
Double Resonance ◽  
Microwave Spectroscopy ◽  
Vibrationally Excited ◽  
Pure Rotation ◽  
Intensity Measurements ◽  
Modes Of Vibration

Abstract The pure rotation spectra of molecules in 25 vibrationally excited states of perdeuterated furazan, C2D2N2O, have been studied by double resonance modulation (DRM) microwave spectroscopy. Twelve of these spectra have been correlated, -on the basis of relative intensity measurements under DRM -, with fundamental vibrations as previously established by IR spectroscopy. Rotational parameters for these 12 fundamental levels are reported, and the contributions to the effective rotational constants and to the inertia defect of the ground state of d2 -furazan have been determined for 10 modes of vibration.

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

1993 ◽  
Vol 48 (4) ◽  
pp. 605-612 ◽  
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
High Resolution ◽  
Excited States ◽  
Vibrational Spectra ◽  
Prior Information ◽  
Microwave Spectroscopy ◽  
Vibrationally Excited ◽  
Ft Ir ◽  
Ir Bands

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.

Sign in / Sign up

Export Citation Format

Share Document