Book Description

Excerpt from Infra-Red Spectra of Neon Argon and Krypton Neutral atoms of the noble gases are characterized by spectra of exceptional utility and rare beauty. Geissler tubes containing these gases at low pressure when excited by moderate electrical discharges, emit spectral lines of high homogeneity which have been demonstrated to be reproducible within 1 part in These lines are favor ably regarded as standards of wavelength, and are extensively used in spectroscopy and metrology. It is not unlikely that one of these lines may ultimately be chosen as the most practical and permanent primary standard of length, especially if an even-numbered isotope can be segregated so that the strongest lines will be free from hyperfine structure. From a theoretical viewpoint the first. Spectra of the noble gases are of special interest because they arise in each case from a; closed shell configuration of electrons, and unlike other complex spectra they are found to consist of extended series of relatively simple types terms) and low multiplicities (singlets and triplets). Evi dence of a gradual transition from sl to jj electron coupling as the atomic complexity increases adds interest to a comparison of the spectral structures of all the noble gases. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.