MEASUREMENT AND ANALYSIS OF THE ATOMIC SPECTRUM OF NEUTRAL ARSENIC (HYPERFINE, SPECTRA, INTERFEROMETRY)
Abstract
The atomic emission spectrum of neutral arsenic has been remeasured from 1644 (ANGSTROM) to 1.2 (mu) and extended to 3.6 (mu). The light source was a microwave-excited electrodeless discharge tube. Instrumentation used included two Fourier spectrometers and a number of concave grating spectrographs. The number of emission lines were increased from the published 333 lines to 1479, 1295 of which are classified as transitions between 95 odd-parity levels and 96 even-parity levels. Of these 191 levels, 104 were the result of this experimental endeavor. Of the previously known 87, 13 were newly classified and 15 reclassified as a result of our analysis. Presently, 175 of the 191 levels are classified. The classifications of these levels were accomplished with the help of ab initio calculations and least-squares fitting methods. Designations are given in both LS and JK representation when possible along with calculated compositions in both representations of the levels consisting of less than 75% of a dominant eigenvector component. Hyperfine-splitting constants have been determined for 75 energy levels using high-resolution Fourier spectra and least-squares fitting methods to analyze the transition profiles. These factors were used to verify the classification of transitions. No theoretical interpretation of these parameters was attempted.
Degree
Ph.D.
Subject Area
Atomic physics
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