Can I read 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 on EtoBox?

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 by Beloy, K.; Borschevsky, A.; Schwerdtfeger, P.; Flambaum, V. V. is a scholarly article available to read on EtoBox.

What is 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 about?

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.~{\bf 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.

Author

Beloy, K.; Borschevsky, A.; Schwerdtfeger, P.; Flambaum, V. V.

Published

2010

Language

EN