Ringing experiments

Figure 8.20. Cumulative number distribution of fragments from four expanding ring experiments (10 fragments each) and comparison with one-dimensional theoretical distribution based on Poisson statistics.

The Source of Green Light Emission Determined from a Heavy-Atom Storage Ring Experiment. 

If the data are stored on floppy-discs, they are always available for further statistical investigations concerned with reproducibility, ring experiments or survey statistics, without taking up storage space. 

The interaction with a cationic center, as in the cyclopropylcarbinyl cation, has a similar character. The main difference is that whereas a proton has no stereochemical requirements with respect to its bond to carbon, the cationic center may take different orientations with respect to the cyclopropane ring. Experiment and theory both agree that the preferred geometry is that known as bisected and that rotation of the cationic center by 90° will raise the energy by about 14 kcal mol The preferred conformation is that which allows the p orbital at the cationic center to interact with the in-plane carbon orbitals in the highest occupied MO. This type of interaction also may be seen in the energies of radical cation states of cyclopropane derivatives as determined by photoelectron spectroscopy . 

We wish to extend our personal thanks to the many persons associated with the warm core ring experiments and with the AOL project. In particular, we are indebted to Jack L. Bufton and the Instrument Electro-Optics Branch for the loan of the frequency-doubled YAG laser. We also thank Wayne E. Esaias and the Oceanic Processes Branch of NASA Headquarters for their assistance and encouragement in various aspects connected with these experiments. 

In the first ion storage ring experiment, it was shown that recombination of HD has peaks in the cross section at high electron energies ( 9 eV), which are due to Rydberg states converging to HD" The mechanism... 

Many more examples could be discussed, but since this is not intended to be a comprehensive review, the reader is referred to Ref. [12] for a more extensive discussion of branching ratios. The general conclusion from the ring experiments carried out so far is that ... 

As mentioned in Chapter 2, these molecules all suffer a high level of strain in the rings. Medium sized rings experience steric strain and the introduction of trans double bonds increases this significantly. This stored energy has dramatic effects on the chemistry of the caryophyllenes and humulenes as we shall see. 

Hofmann K (1998). The feed component meat meal in a heating test ring experiment. Kraftfutter/FeedMag., 6 251-255. 

---