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Enhanced Sensitivity to the Time Variation of the Fine-Structure Constant and $m_p/m_e$ in Diatomic Molecules: A Closer Examination of Silicon Monobromide | | K. Beloy
; A. Borschevsky
; P. Schwerdtfeger
; V. V. Flambaum
; | | Date: |
2 Jul 2010 | | Abstract: | Recently it was pointed out that transition frequencies in certain diatomic
molecules have an enhanced sensitivity to variations in the fine-structure
constant $alpha$ and the proton-to-electron mass ratio $m_p/m_e$ due to a near
cancellation between the fine-structure and vibrational interval in a ground
electronic multiplet [V.~V.~Flambaum and M.~G.~Kozlov, Phys. Rev. Lett.~{f
99}, 150801 (2007)]. One such molecule possessing this favorable quality is
silicon monobromide. Here we take a closer examination of SiBr as a candidate
for detecting variations in $alpha$ and $m_p/m_e$. We analyze the rovibronic
spectrum by employing the most accurate experimental data available in the
literature and perform emph{ab initio} calculations to determine the precise
dependence of the spectrum on variations in $alpha$. Furthermore, we calculate
the natural linewidths of the rovibronic levels, which place a fundamental
limit on the accuracy to which variations may be determined. | | Source: | arXiv, 1007.0393 | | Services: | Forum | Review | PDF | Favorites | |
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