skip to main content

Title: Excalibur : A Nonparametric, Hierarchical Wavelength Calibration Method for a Precision Spectrograph
Authors:
; ; ;
Award ID(s):
2009528
Publication Date:
NSF-PAR ID:
10346431
Journal Name:
The Astronomical Journal
Volume:
161
Issue:
2
Page Range or eLocation-ID:
80
ISSN:
1538-3881
Sponsoring Org:
National Science Foundation
More Like this
  1. We report on spectroscopic measurements on the4f76s28S7/2∘<#comment/>→<#comment/>4f7(8S∘<#comment/>)6s6p(1P∘<#comment/>)8P9/2transition in neutral europium-151 and europium-153 at 459.4 nm. The center of gravity frequencies for the 151 and 153 isotopes, reported for the first time in this paper, to our knowledge, were found to be 652,389,757.16(34) MHz and 652,386,593.2(5) MHz, respectively. The hyperfine coefficients for the6s6p(1P∘<#comment/>)8P9/2state were found to beA(151)=−<#comment/>228.84(2)MHz,B(151)=226.9(5)MHzandA(153)=−<#comment/>101.87(6)MHz,B(153)=575.4(1.5)MHz, which all agree with previously published results except for A(153), which shows a small discrepancy. The isotope shift is found to be 3163.8(6) MHz, which also has a discrepancy with previously published results.