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A novel laser spectroscopic method with a molecular beam is successfully demonstrated. This technique is widely applicable for studies of collisional relaxation on a variety of molecular transitions, even when untunable infrared molecular lasers are used. The effect of collision‐induced...
Solutions of certain urethane substituted polydiacetylenes undergo dramatic, reversible color changes on addition of a nonsolvent. In some cases, the lowest energy optical transition of the polymer shifts by more than 5000 cm −1 (21 300 cm −1 to 15 900 cm −1 when the nonsolvent is added)....
The species ArCO 2 produced by adiabatic expansion is structurally characterized by molecular beam electric resonance spectroscopy. ArCO 2 is shown to have C 2 v symmetry. The spectroscopic constants obtained are: The derived structural constants for ArCO 2 are: Comparison is made with a number...
Recent Brillouin backscattering geometry studies of sodium cyanide are reported. The (100) longitudinal acoustic phonon frequency is measured and used, together with index of refraction and density data, to determine C 11 and other elastic constants.
The electronic absorption spectrum in the gas phase of the metastable 1 3 B 2 state of acetylene has been observed. Its’ features, including rotational and vibronic structure as well as deuterium isotope effects, agree remarkably well with a b i n i t i o theoretical predictions for the 1 3 A 2...
Exact series coefficients through eighth order are reported for the high temperature expansion of the Gaussian core model free energy. Although this expanison has a vanishing radius of convergence it can be summed by a Borel integral transform. It is demonstrated that this Borel transform has an...
TaN was produced in a hollow cathode sputtering source and trapped in argon matrices at 14 °K. The absorption spectra was found to be most intense near 19 200 and 24 000 cm −1 .
The location of a half monolayer of ordered hydrogen adatoms on Ni(111) has been analyzed by Low‐Energy Electron Diffraction (LEED), Thermal Desorption Spectroscopy (TDS), and Work Function (Δϕ) measurements. It is found that the hydrogen atoms are arranged in an overlayer of graphitic...
EPR spectra of Mn 2+ in single crystals of FeSiF 6 ⋅6H 2 O have been studied at 16.5 and 25.0 GHz in the parallel orientation at 4.2 K. The spectra were fitted to a standard spin Hamiltonian with g z =2.0005±0.0005, D =−(254±1) ×10 −4 cm −1 , E =−(40±10) ×10 −4 cm −1 , a − F...
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