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Optically active molecules will show differential absorption, as between opposite handedness of the radiation, for two‐photon absorption. A theoretical estimate is made of the expected ratio of the differential rate to the total rate and an order of magnitude of this ratio for a simple helical...
NMR spectra at temperatures down to 1.8 K are given for the 19 F resonance of SF 6 and CF 4 in H 2 O and D 2 O clathrates and for the 1 H resonance in CH 4 –D 2 O and CH 4 –tetrahydrofuran‐ d 8 –D 2 O clathrates. The second moments correspond effectively to isotropic reorientation of...
The average Compton profile, and the Compton profiles along directions parallel to the bonds and perpendicular to the plane of each of the N 2 , O 2 , and CH 2 O molecules, were calculated at two levels of approximation. The uncorrelated charge densities were obtained from wavefunctions...
Angular distributions are calculated for the ejection of photoelectrons in the energy range of less than 1 eV to above 50 eV from molecules having 1 s σ 2 g , 2 p σ 2 g , or 2 p σ 2 u configurations. The continuum wavefunction for the photoelectron is calculated in the...
We have observed the infrared spectra of GaCl 3 , GaBr 3 , and GaI 3 in solid argon. Some absorptions due to the dimers are also reported. Isotopic shifts were partially resolved in several cases. The observed spectra are all consistent with a planar D 3 h structure for each of these molecules.
A new transition in molecular nitrogen at an energy loss of 31.4±0.5 eV has been observed by high energy electron impact spectroscopy at momentum transfers larger than 2 a.u. The absolute generalized oscillator strength was measured over the momentum transfer range 0.5? K 2 ?5.08 a.u. using 25...
Self‐broadened and foreign‐gas (N 2 and O 2 ) broadened linewidths of O 3 at 300 °K for a wide range of quantum numbers J and K a , for both type A and type B bands, have been calculated using the Anderson–Tsao–Curnutte theory of line broadening. In the case of O 3 –O 3 collisions,...
The scattering of He, Ne, and Ar from (100) copper has been studied experimentally. Both space and velocity distributions were measured. Special attention was paid to the cleanliness of the surface and to the effect of possible surface contamination. The influence of the beam incidence, the...
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