M. Kent Wilson

Infrared Intensities in Liquid and Gas Phases

It is shown that Debyes and Onsagers theories of dielectric polarization lead to the same expression for the relation between the intensities of an infrared absorption band in the liquid and in the gas phases.

Vibration Spectra of Some Mixed Halides of Boron

Mixed halides of boron have been shown to exist in binary mixtures of the trihalides. Most of the fundamental frequencies of BF2Cl, BFCl2, BF2Br, BFBr2, BCl2Br, and BClBr2 for molecules containing boron‐10 and boron‐11 have been observed and assigned to the proper modes of vibration. With the aid of the trihalide frequencies a normal coordinate treatment has been made for the mixed halides. Some discussion of the validity of transferring force constants in this system has been given.

Vibrational Spectrum of Disilane

Raman spectra of the liquid and infrared spectra of the gaseous phase have been obtained for Si2H6 and Si2D6. With the exception of the torsional mode all fundamental frequencies have been observed and assigned to the proper normal modes. The coarse rotational structure of the perpendicular bands, ν8 and ν9, has been resolved and the corresponding Coriolis coupling coefficients determined. Comparisons with the spectra of ethane and digermane have been made.

Infrared Spectra and Molecular Structures of SiH3F, SiH3Cl, and SiH3Br

The structure of the e‐type fundamentals of SiH3F, SiH3Cl, and SiH3Br has been resolved and analyzed. The values of the small amount of inertia thus obtained has been combined with microwave measurements to yield the dimensions of the SiH3 group in these molecules. It is shown that the differences in the structure of the SiH3 group are probably within experimental error. Several revisions have been made in the vibrational assignments for SiH3F and SiH3Cl.

The Infrared Spectra of NF3 and PF3

The infrared spectra of NF3 and PF3 have been investigated with a prism instrument in the range 250 cm−1 to 5000 cm−1. The fundamental frequencies are for NF3, ν1(A1)=1032 cm−1, ν2(A1)=647 cm−1, ν3(E)=905 cm−1, and ν4(E)=493 cm−1; and for PF3, ν1(A1)=892 cm−1, ν2(A1)=487 cm−1, ν3(E)=860 cm−1, and ν4(E)=344 cm−1. Force constants as well as thermodynamic functions are calculated for both molecules.

Infrared Spectra of Some MH4 Molecules

Molecular constants have been obtained for a number of the fourth‐group hydrides. The values of the M—H distances which have been obtained under the assumption of tetrahedral angles are: SiD3H, 1.480±0.001 A; GeH3D, 1.525±0.001 A; GeD3H, 1.532±0.001 A; SnD3H, 1.701±0.001 A.

Infrared Spectra of Some Deuterated Silanes

The infrared spectra of SiD4, SiHD3, and SiH2D2 have been observed in the region 2—16 microns. Values of ζ obtained for the 851 cm—1 band of SiHD3 and the 1597 cm—1 band of SiD4 are 0.76 and 0.10, respectively. Assignments are given for the observed bands and force constants are calculated.

Vibrational Spectrum of Borine Carbonyl

The infrared spectra of both solid and gaseous BH3CO, 10BH3CO, BD3CO, and 10BD3CO have been obtained. In addition some observations have been made on the Raman spectra of the gaseous compounds. Fundamental frequencies have been assigned to all normal modes and the vibrational potential constants for borine carbonyl have been approximated by means of a simplified force field.

Infrared Spectrum of S16O18O and the Potential Constants of SO2

An investigation of the infrared spectrum of S16O18O results in the following frequency assignment: ν1=1122±1 cm−1,  ν2=506.8±0.5 cm−1,  ν3=1341±0.5 cm−1. These data combined with the fundamental frequencies of S16O2 have been used to calculate the potential constants for sulfur dioxide. These are fd=10.02,  fdd=0.03,  1dfdα=0.20,  1d2fα=0.793.

The Infrared Spectrum of SO2F2

The infrared spectrum of sulfuryl fluoride has been investigated between 240 cm−1 and 4000 cm−1 with a prism spectrometer. Seven of the nine fundamentals have been observed and assigned to their appropriate symmetry species. Ten additional bands have been assigned as combinations or overtones. A partial force constant calculation has been made.