论文信息 - Microwave Spectrum of Methyl Difluorosilane

Microwave Spectrum of Methyl Difluorosilane

The microwave spectra of five isotopic species of methyl difluorosilane (CH3SiHF2) have been observed. From the rotational constants, the following structural parameters were determined rFF=2.541±0.001 ArSiC=1.833±0.002 A∠FSiF=106∘44′±30′rSiF=1.583±0.002 A∠;CSiH=116∘10′±1∘rSiH=rSiD=1.474±0.005 A∠FSiC=109∘52′±30′rCH=1.09 A (assumed)∠HCH=108∘ (assumed). A dipole moment of 2.11 debye was obtained from Stark effect measurements.The hindered internal rotation of the methyl group splits some of the rotational lines into doublets with spacings from 0.5 to 2.9 Mc. An analysis of the doublet splitting in three of the isotopic species gives a barrier height of 439 cm—1 (1255 cal/mole) hindering internal rotation.

B. Stoicheff | J. Swalen

[1] J. D. Swalen,et al. Internal Barrier of Propylene Oxide from the Microwave Spectrum. I , 1957 .

[2] L. Pierce,et al. Microwave Spectrum, Structure, and Internal Barrier of Methyl Silane , 1957 .

[3] V. Laurie. Microwave Spectrum, Dipole Moment, and Structure of Difluorosilane , 1957 .

[4] C. Lin,et al. Calculation of Energy Levels for Internal Torsion and Over‐All Rotation. II. CH3CHO Type Molecules; Acetaldehyde Spectra , 1957 .

[5] K. Hecht,et al. Hindered Rotation in Molecules with Relatively High Potential Barriers , 1957 .

[6] Dudley R. Herschbach,et al. Internal Barrier in CH3CH2F and CH3CHF2 from Torsional Satellites , 1956 .

[7] J. Swalen. Note on the Calculation of Energy Levels in Molecules with Internal Torsion , 1956 .

[8] J. Kraitchman. Determination of Molecular Structure from Microwave Spectroscopic Data , 1953 .

[9] K. B. McAfee,et al. A Stark-effect microwave spectrograph of high sensitivity. , 1949, The Review of scientific instruments.

[10] S. Golden,et al. The Stark Effect for a Rigid Asymmetric Rotor , 1948 .