Showing papers by "Lester Andrews published in 1967"
TL;DR: In this article, a careful study of the electronic spectrum of lithium atoms deposited in solid argon, krypton, and xenon showed that isolation of the incident lithium atoms improved with increasing matrix atomic weight, decreasing lithium-atom concentration, and decreasing deposition temperature.
Abstract: A careful study of the electronic spectrum of lithium atoms deposited in solid argon, krypton, and xenon showed that isolation of the incident lithium atoms improved with increasing matrix atomic weight, decreasing lithium‐atom concentration, and decreasing deposition temperature and that dimerization of the incident atoms proceeds to a major extent except in very dilute samples of xenon deposited at 4°K. The lithium atomic absorptions showed multiplet structure similar to those reported earlier for metal atoms in inert‐gas matrices. The multiplet components varied in relative intensity on sample warming. Nonnearest‐neighbor metal—metal atom interactions were shown to be likely contributors to the observed spectral features. The present work indicates the importance of thorough study of concentration and sample‐temperature dependence before multiplet splittings can be interpreted.
71 citations
TL;DR: In this paper, the fundamental frequencies of methyl radical and lithium atoms in a matrix reaction were investigated and the potential constants kH−C=4.32 mdyn/A, kH-C−H=0.50 mdyn·A/rad2, kC−C−Li =0.12 mdyn-a/rad,2 and kC-Li= 0.78 mdyn−A/A.
Abstract: Continued matrix reaction of methyl radical and lithium atoms produces methyl lithium, CH3Li. Isotopic substitutions at all atomic positions verify the molecular identity and indicate that the monomeric species is isolated. The fundamental frequencies, which are slightly lower than those for methyl halides and reasonably near those for solid methyl lithium in mulls, lead to the potential constants kH–C=4.32 mdyn/A, kH–C–H=0.50 mdyn·A/rad2, kH–C–Li=0.12 mdyn·A/rad,2 and kC–Li=0.78 mdyn/A. The low H–C–Li bending force constant suggests a significant amount of ionic character in the C–Li bond.
70 citations
TL;DR: In this paper, the chemistry department and Center for Advanced Studies at the University of Virginia proposed a method to solve the problem of high-dimensional geometry of molecules in terms of their properties.
Abstract: Author Institution: Chemistry Department and Center for Advanced Studies, University of Virginia
22 citations