โ Scribed by C.Michael Lindsay; Benjamin J. McCall
No coin nor oath required. For personal study only.
Since its initial detection in 1980, there have been 17 laboratory studies of the H + 3 infrared spectrum, reporting 895 transitions from a variety of fundamental, overtone, combination, and hot bands. The results of these two decades of labor, however, are difficult to utilize. There is no comprehensive list of the observed H + 3 transitions, and the literature contains errors in frequency measurement and assignment due to the inherent difficulty of the measurements and the complexity of the spectrum. This paper resolves these problems while assembling all of the data into a single source. We have reviewed all reported transitions of H + 3 for reliability in frequency measurement and have reassigned them based on a comparison with recent theoretical calculations. We have also developed a complete labeling scheme for all energy levels below 9000 cm -1 , which alleviates the confusion in assigning H + 3 transitions that results from the difficulty of labeling the rovibrational energy levels of a molecule with such strong mixing. Our comprehensive linelist was then used to produce a set of 526 experimentally determined energy levels, which facilitates direct comparison with theoretical calculations and prediction of the "forbidden" pure rotation spectrum of H + 3 .
๐ SIMILAR VOLUMES
A comprehensive collection of 13C chemical shifts of 159 tri-and tetracyclic quinolizidine alkaloids (sparteine derivatives) is presented. The data are discussed in terms of substituent e โ ects, molecular geometries and protonation e โ ects. Some IR, 1H and 15N NMR and MS data are included.
## Abstract A description of the current range of activities being pursued in the compilation and evaluation of chemical kinetic data is given. The roles of individual scientists, professional groups, and national and international programs are detailed. The special problems attending on kinetic pa