Chemical effects of the decay of sulfur-35 incorporated into hexanethiol molecules

The chemical effects of the -decay of³⁵S incorporated into doubly labeled molecules of primary and secondary n-hexanethiols have been studied. The final products, viz.¹⁴C₆H¹³Cl-1 and¹⁴C₆H₁₃Cl-2 were isolated by means the preparative GLC and determined by radiometric method. It has been estiblished that in the gas phase about 60% of primary molecular ions were stabilized in form of hexyl chlorides. In presence of water vapor the yield of hexyl chlorides increases to about 90%.     

Active coherent beam combining of diode lasers

We have demonstrated active coherent beam combination (CBC) of up to 218 semiconductor amplifiers with 38.5?W cw output using up to eleven one-dimensional 21-element individually addressable diode amplifier arrays operating at 960?nm. The amplifier array elements are slab-coupled-optical-waveguide semiconductor amplifiers (SCOWAs) set up in a master-oscillator-power-amplifier configuration. Diffractive optical elements divide the master-oscillator beam to seed multiple arrays of SCOWAs. A SCOWA was phase actuated by adjusting the drive current to each element and controlled using a stochastic-parallel-gradient-descent (SPGD) algorithm for the active CBC. The SPGD is a hill-climbing algorithm that maximizes on-axis intensity in the far field, providing phase locking without needing a reference beam.