Electric Dipole Moments of Several Molecules from the Stark Effect
TL;DR: The following molecular electric dipole moments, in Debye units, have been obtained from the Stark effect of pure rotational spectra observed in the microwave region: 0.234±0.004 for NF3, 1.03±0,0.01 for PF3; 1.77± 0.06 for CH3CN; 3.83± 0.,3.00±0.,0.02 for HCN, 3.92± 0,2.
Abstract: The following molecular electric dipole moments, in Debye units, have been obtained from the Stark effect of pure rotational spectra observed in the microwave region: 0.234±0.004 for NF3; 1.03±0.01 for PF3; 1.77±0.02 for POF3; 3.00±0.02 for HCN; 3.92±0.06 for CH3CN; 3.83±0.06 for CH3NC; 1.79±0.02 for CH3F; 0.75±0.01 for CH3CCH; 1.26±0.01 for SiF3H. All values apply to the ground vibrational state.
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TL;DR: In this article, a simple tetravalent species - alkyls and related compounds - with four-coordinate isolated E(IV) species and coordination numbers above four for Ge and Pb are described.
Abstract: 1
Introduction
2
Atomic Properties
3
Calculational Methods
4
Structures
5
Bond Dissociation Energies
Keywords:
simple tetravalent species - alkyls and related compounds;
unstrained rings with four-coordinate isolated E;
eight-ring oxygen compounds;
element(IV) species and coordination numbers above four;
coordination numbers above four for Ge and Pb;
transition metal organo-E(IV) compounds;
stannocenes and related compounds;
doubly bonded germanium, tin and lead
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TL;DR: In this article, the heat capacity of phosphoryl fluoride has been measured from 12 to 240°K for a sample with a purity greater than 99.9 mole % and the heat of fusion was 3086 cal/mole.
Abstract: The heat capacity of phosphoryl fluoride has been measured from 12 to 240°K for a sample with a purity greater than 99.9 mole %. The solid–liquid–vapor triple‐point temperature and pressure were, respectively, 233.45°K and 774.06 torr. The heat of fusion was 3086 cal/mole. The heat of vaporization was determined as 5150 cal/mole at a temperature of 236.00°K and a pressure of 880.25 torr. The vapor pressure data were fitted by the equation lnP(torr) = − 487.49218 + 14 223.578 / T + 79.446599 lnT for the solid and by lnP(torr) = 8.05651 − 1206.41 / T for a short temperature range in the liquid phase. An entropy discrepancy, Sspec − Scalc, of 1.33 cal/mole·°K at 236.00°K was found between the spectroscopic entropy of 64.777 cal/mole·°K and the calorimetric value of 63.45 cal/mole·°K. A tentative model to explain the discrepancy has been proposed in which it is assumed that the degree of degeneracy of the several lowest eigenstates of the molecular motion are reduced when the molecule in the solid is subjecte...
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TL;DR: In this article, the microwave spectrum of 2-furancarbonitrile has been studied in the frequency region from 10 to 20 GHz, and the rotational constants (MHz) for the ground vibrational state are determined to be A=9220.0±0.2, B=2029.27± 0.01, and C=1662.64±1.01.
Abstract: The microwave spectrum of 2-furancarbonitrile has been studied in the frequency region from 10 to 20 GHz. The rotational constants (MHz) for the ground vibrational state are determined to be A=9220.0±0.2, B=2029.27±0.01, and C=1662.64±0.01. The dipole moment is determined to be μ=4.71±0.02 D with the components μa=4.62±0.02 D and μb=0.90±0.01 D. These data suggest that the furan ring is probably distorted.
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01 Jan 2010
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TL;DR: A microwave spectrograph is described in which the absorption of the gas being studied is modulated by the application of a periodic Stark‐effect field so that the output of the crystal detector contains a radiofrequency component which can be amplified with a narrow‐band amplifier.
Abstract: A microwave spectrograph is described in which the absorption of the gas being studied is modulated by the application of a periodic Stark‐effect field so that the output of the crystal detector contains a radiofrequency component which can be amplified with a narrow‐band amplifier. By using a very narrow band‐width, achieved by employing phase‐sensitive detection, high sensitivity is obtained. The klystron is swept mechanically over the frequency range. Details of the components are given.
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