Microwave Spectrum, Internal Barrier, Structure, Equilibrium Configuration, and Dipole Moment of Methyl Monofluorosilane

1958 ◽  
Vol 29 (2) ◽  
pp. 383-388 ◽  
Author(s):  
Louis Pierce
Keyword(s):  
Dipole Moment ◽  
Equilibrium Configuration ◽  
Microwave Spectrum ◽  
Barrier Structure ◽  
Internal Barrier

Mikrowellenspektrum, interne Rotation, Struktur und Dipolmoment von Methylchloroform

1968 ◽  
Vol 23 (2) ◽  
pp. 307-311
Author(s):  
R. Holm ◽  
M. Mitzlaff ◽  
H. Hartmann
Keyword(s):  
Dipole Moment ◽  
Stark Effect ◽  
Equilibrium Configuration ◽  
Structural Parameters ◽  
Microwave Spectrum ◽  
Methyl Group ◽  
Intensity Measurements ◽  
Isotopic Species ◽  
Asymmetric Top ◽  
Torsional Isomers

The microwave spectrum of several symmetric and asymmetric top isotopic species of CH3CCl3 has been studied in the region from 8 to 40 GHz. A least squares analysis of the rotational con-stants gave the following structural parameters :dC-C =(1.541 ±0.001) A, dC-Cl = (1,7712 ± 0.0008) A, dC-H = (1.090 ± 0.002) A, ∢H—C—H= (110.04±0.25) ° , ∢Cl—C—Cl= (109.39 ±0.25) ° .A dipole moment of μ = (1.755 ± 0.015) D has been derived from the investigation of the Stark effect of the transition J=4→5 of CH3CCl3335. From intensity measurements the barrier to internal rotation is estimated to be (1740 ± 300) cal/mol. An analysis of the spectrum of CH2DCCl2Cl37 shows conclusively that methylchloroform in its equilibrium configuration has the methyl group staggered with respect to the CCl3-group. It could be shown that there exist two torsional isomers gauche and anti with specific microwave spectra.

Microwave spectrum, dipole moment, and conformation of ethanedithiol

1984 ◽  
Vol 81 (2) ◽  
pp. 1051-1053 ◽  
Author(s):  
R. N. Nandi ◽  
Chun‐Fu Su ◽  
Marlin D. Harmony
Keyword(s):  
Dipole Moment ◽  
Microwave Spectrum

scholarly journals The Microwave Spectrum of 3,4-Dihydro-1,2-Pyran

1985 ◽  
Vol 40 (9) ◽  
pp. 913-919
Author(s):  
Juan Carlos López ◽  
José L. Alonso
Keyword(s):  
Dipole Moment ◽  
Excited States ◽  
Ground State ◽  
Principal Axis ◽  
Microwave Spectrum ◽  
Average Intensity ◽  
Ring Conformation ◽  
Vibrationally Excited ◽  
Rotational Constants ◽  
Displacement Measurements

Abstract The rotational transitions of 3,4-dihydro-1,2-pyran in the ground state and six vibrationally excited states have been assigned. The rotational constants for the ground state (A = 5198.1847(24), B = 4747.8716(24) and C = 2710.9161(24) have been derived by fitting μa, μb and μc-type transitions. The dipole moment was determined from Stark displacement measurements to be 1.400(8) D with its principal axis components |μa| =1.240(2), |μb| = 0.588(10) and |μc| = 0.278(8) D. A model calculation to reproduce the ground state rotational constants indicates that the data are consistent with a twisted ring conformation. The average intensity ratio gives vibrational separations between the ground and excited states of the ring-bending and ring-twisting modes of ~ 178 and ~ 277 cm-1 respectively.

On the Microwave Spectrum and Electric Dipole Moment of Fluorobenzene

1959 ◽  
Vol 31 (5) ◽  
pp. 1438-1438 ◽  
Author(s):  
Dora G. de Kowalewski ◽  
Per Kökeritz ◽  
Hans Selén
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Microwave Spectrum
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