SPECTROSCOPY OF HIGH-TEMPERATURE LITHIUM VAPOR
Loading...
Date
1992
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Theoretical studies are reported of high-temperature ($T \approx 1,800^{\circ}K$) inert-gas-buffered Li/$Li_{2}$ vapor absorption cross sections in support of concomitant transmission measurements over the visible spectral region. Particular attention is addressed to the Li resonance doublet and to the X $\rightarrow$ A, B bands of $Li_{2}$. Excitation of high rotational states ($J_{\max}$ $\approx$ 30) necessitates careful treatment of non-rigid rotor effects and the general J-dependence of absorption strengths. Voigt lineshapes and appropriate pressure widths (P $\approx$ 1 atm.) are employed in construction of rotationally resolved absolute cross sections for comparison with and interpretation of the measured spectra. Comments are provided on the possible presence of $Li_{2}$ triplet contributions to the spectra, on the identification of absorption features due to trace contaminants, verification of Li/$Li_{2}$ equation-of-state data, and on the ab initio procedures employed in the calculations.
Description
Author Institution: Department of Chemistry, Indiana University; Propulsion Division, Phillips Laboratory