No abstract

A new method is demonstrated which allows derivation of elements of the correlated-product-state distribution matrix in photodissociation. The method relies on quantum-state-specific, time-of-flight measurements, which were successfully carried out on CO produced in ketene photolysis at 308 nm. Such time-of-flight data exhibits well-defined peaks dictated by the CH2 internal state distribution occurring in coincidence with the chosen CO quantum state. For two rovibrational states of CO, peaks corresponding to the 1A1(0,0,0), 1A1(0,1,0), and 3B1 vibronic states of the CH2 fragment were clearly resolved.

No abstract

This paper investigates the relationship between mass and momentum transport. This study of mass transfer is an important design consideration when looking at engineering processes such as evaporation, chemical reactions, corrosion and mixing. Little is know about the relationship. Using the non-intrusive optical technique of Electronic Speckle Pattern Interferometry (ESPI), concentration profile measurements were carried out. A phase-shifting algorithm was also employed to give whole field measurements. Momentum transport in the velocity boundary layer was examined using Particle Image Velocimetry (PIV), which is also a non-intrusive optical technique. The two measurements were taken independently so as to reduce the effect that seed particles may have on the interferometric measurements. A concentration profile was developed above a surface by passing airflow across a flat plate containing a well of ethanol. The rate of mass transfer is obtained from the concentration profile produced as the ethanol vapour diffuses into the airflow. The experiment is set up to measure diffusion from a flat plate and to compare it with the integral solution of the mass transfer equation. Data is presented to show the dependence of the Sherwood number on the Reynolds number.

While there are many causes why music students withdraw before graduating, the author pinpoints eleven specific causes and analyzes each in turn, on the basis of facts gleaned from the students, their instructors, and official records.