Microwave spectroscopy. Introductory paper: quadrupole couplings, dipole moments and the chemical bond

1955 ◽  
Vol 19 ◽  
pp. 14 ◽  
Author(s):  
Walter Gordy
Keyword(s):  
Chemical Bond ◽  
Dipole Moments ◽  
Microwave Spectroscopy ◽  
Introductory Paper

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.

Rotational Isomerism and the Orientation of the Total Dipole Moment

1980 ◽  
Vol 35 (7) ◽  
pp. 748-756 ◽  
Author(s):  
Ivan Botskor
Keyword(s):  
Experimental Data ◽  
Dipole Moment ◽  
Gas Phase ◽  
Dipole Moments ◽  
Microwave Spectroscopy ◽  
Rotational Isomerism ◽  
Total Dipole Moment

A method for determining the orientation of the total dipole moments of distinct rotamers of the same molecule is discussed. Utilizing solely the experimental dipole moments obtained with microwave spectroscopy (gas phase) and an approximate structure, the orientation of the dipole moment can often be determined without use of bond moment considerations. Experimental data from nine rotamer pairs are analyzed to illustrate the method.

Some Molecular Dipole Moments Determined by Microwave Spectroscopy

1951 ◽  
Vol 82 (1) ◽  
pp. 95-95 ◽  
Author(s):  
James N. Schoolery ◽  
A. Harry Sharbaugh
Keyword(s):  
Dipole Moments ◽  
Microwave Spectroscopy ◽  
Molecular Dipole

Determination of Dipole Moments by Microwave Fourier Transform Spectroscopy. Trifluoropropine, Tert.Butylisocyanide, and Cvanoacetylene

1984 ◽  
Vol 39 (10) ◽  
pp. 1003-1004
Author(s):  
W. Kasten ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Dipole Moments ◽  
Fourier Transform Spectroscopy ◽  
Microwave Spectroscopy

Abstract We report the measurements of dipole moments by Microwave Fourier Transform Spectroscopy. Hereby we indicate that it is worth to supplement this type of microwave spectroscopy to increase its capability.

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