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, rotationally-summed elastic cross sections for electrons collisions with the isomers acetonitrile and methyl isocyanide were calculated using the UK molecular R-matrix codes in the energy range from 1 eV to 10 eV. The dynamic interaction is represented within a static exchange plus polarization model based on the use of an extensive orbital sets.
Abstract: Rotationally-summed elastic cross sections for electrons collisions with the isomers acetonitrile and methyl isocyanide are reported. Theoretical differential and integral cross sections are calculated using the UK molecular R-matrix codes in the energy range from 1 eV to 10 eV. The dynamic interaction is represented within a static-exchange plus polarization model based on the use of an extensive orbital sets. Both molecule have a large permanent dipole moment and a Born closure procedure is used to get more reliable cross sections. These molecules show low-energy, π
∗ resonances at 2.4 and 2.7 eV for CH3CN and CH3NC, respectively; and very broad σ
∗ ones at about 6 eV. Our results suggest that electron collisions with CH3CN / CH3NC show similar properties to those found for electron collisions with HCN / HNC.
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TL;DR: The microwave spectra of trimethylsilylcyanide and trimethyl silylisocyanide have been recorded between 26.5 and 40.0 GHz in this article, where the reaction products from the standard method of preparation used in this study were found to contain 5.3 % (CH 3 ) 3 SiNC at 25 °C.
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TL;DR: In this article, it is shown that the five-membered ring structure is planar from the values of the components of the dipole moment, as well as from the value of the inertial defect as a function of the ring puckering quantum number.
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TL;DR: In this paper, the microwave spectra have been recorded from 18.0 to 26.5 GHz for the four naturally occurring isotopes of germane: 70Ge, 72Ge, 74Ge, and 76Ge.
Abstract: The microwave spectra have been recorded from 18.0 to 26.5 GHz for 12CH3GeH212C14N, 13CH3GeH212C14N, 12CH3GeH212C15N, 12CH3GeH213C14N, 12CH3GeD212C14N, and 12CD3GeH212C14N of the four naturally occurring isotopes of germane: 70Ge, 72Ge, 74Ge, and 76Ge. Only a‐type transitions were observed and R‐branch assignments have been made for all the isotopic species in the ground vibrational state from which the rotational constants were determined. From these data the complete structural parameters were determined to be r0(CME–Ge)=1.933±0.002 A, r(Ge–CCN)=1.927±0.004 A, r(C≡N)=1.155±0.004 A, r(Ge–H)=1.521±0.001 A, r(C–Hs)=1.092±0.005 A, r(C–Ha)=1.092±0.005 A, ∢CGeC=107.36°±0.60°, ∢HGeH=111.41°±0.04°, ∢HGeCMe=112.92°±0.08°, ∢HsCGe=109.5°±2.0°, and
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TL;DR: In this article, the microwave spectrum of cyclopropane has been studied and only the gauche form of the molecule has been observed, consistent with the infrared results where the dominant form (>85%).
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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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