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Title:A URANIUM ATLAS IN ASCII FORMAT, 20000 - 27000 cm−1
Author(s):Ross, Amanda J.
Contributor(s):Adam, Allan G.; Tokaryk, Dennis W.; Crozet, Patrick
Subject(s):Spectroscopy as an analytical tool
Abstract:This work was motivated by difficulties encountered while trying to calibrate laser excitation spectra, taken in short (1 {cm$^{-1}$}) scans around 438 nm, by matching optogalvanic transitions from a Uranium-Argon hollow cathode lamp to peaks listed in a widely circulated `informal report' on the Uranium spectrum (11000~--25900 {cm$^{-1}$}) from Los Alamos, published in 1980\footnote{An atlas of uranium emission intensities in a hollow cathode discharge; Palmer, Keller \& Engleman, Los Alamos report LA 8251-MS, (1980)}. Short pieces of excitation spectra often fell between secure calibration lines, because many of the weaker features had been excluded from the printed linelist. To remedy this, we have re-recorded emission from a commercial Uranium hollow-cathode lamp 19800~--~27400 {cm$^{-1}$} on a Fourier transform spectrometer, at an instrumental resolution of at 0.04 {cm$^{-1}$}. The wavenumber scale was fine-tuned to match earlier reference data$^{a}$\footnote{Comparing the emission spectra of U and Th hollow cathode lamps, and a new U line list; Sarmiento $et ~al.$, A \& A, \underline{618}, A118, (2018)}\footnote{Uranium and iodine standards measured by means of Fourier-transform spectroscopy; Gerstenkorn, $et ~al.$, A \& A, \underline{58}, 255-66, (1977)} to within 0.003 {cm$^{-1}$}. This spectrum (together with its peak list) is proposed in ascii format\footnote{A uranium atlas, from 365 to 505 nm; Ross $et ~al.$ J Mol Spectrosc (accepted) 2020} as a possible aid to calibration of laser excitation spectra in the blue, violet and near UV. It extends the spectrum reported by Sarmiento and co-workers$^{b}$ that focused on calibration of astronomical spectrographs in the near IR and visible.
Issue Date:25-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Date Available in IDEALS:2020-06-26

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