Volume 110, Issue 21, 01 June 1999
Index of content:
110(1999); http://dx.doi.org/10.1063/1.478955View Description Hide Description
Time-of-flightspectra of HF products in the vibrational state from reactive scattering of F atoms from exhibit at least four smaller peaks which are assigned to the rotational states 8, 9, and 10. The center-of-mass rotational distributions are in good agreement with accurate quantum mechanical and approximate coupled states calculations.
110(1999); http://dx.doi.org/10.1063/1.478039View Description Hide Description
A strong nonresonant nanosecond laser pulse is used to align neutral iodine molecules. The technique, applicable to both polar and nonpolar molecules, relies on the interaction between the strong laser field and the induced dipole moment of the molecules. The degree of alignment is enhanced by lowering the initial rotational energy of the molecules or by increasing the laser intensity. The alignment is measured by photodissociating the molecules with a femtosecond laser pulse and detecting the direction of the photofragments by imaging techniques. The strongest degree of alignment observed is
Formation of ordered structure in Langmuir monolayers of semifluorinated hydrocarbons: Molecular dynamics simulations110(1999); http://dx.doi.org/10.1063/1.478956View Description Hide Description
We report the results of molecular dynamics simulations of Langmuirmonolayers of a semifluorinated hydrocarbon molecule Our simulations show that highly ordered structures are formed at low temperature after quenching from a random structure at high temperature. The structural formation process of the monolayer is characterized by a decrease in the gauche defects of the hydrocarbon block and an increase in the global bond-orientational order throughout the chain molecules. It is also found that the monolayer structure consists of mixed orientations for the head-group-free molecule, with a slightly larger fraction for a hydrocarbon-down, fluorocarbon-up configuration.