Precision spectroscopy of the $A^2Π$ $\leftarrow$ $X^2Σ^+$ transition in BaF
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Mooij, M. C. Bethlem, H. L. Ubachs, W. Aggarwal, P. Boeschoten, A. Borschevsky, A. Chamorro, Y. Denis, M. Fikkers, T. H. Hoekstra, S. van Hofslot, J. W. F. Jones, S. A. Marshall, V. R. Meijknecht, T. B. Timmermans, R. G. E. de Vries, J. Willmann, L. |
| author_facet | Mooij, M. C. Bethlem, H. L. Ubachs, W. Aggarwal, P. Boeschoten, A. Borschevsky, A. Chamorro, Y. Denis, M. Fikkers, T. H. Hoekstra, S. van Hofslot, J. W. F. Jones, S. A. Marshall, V. R. Meijknecht, T. B. Timmermans, R. G. E. de Vries, J. Willmann, L. |
| contents | High-resolution spectroscopy on the $A^2Π$ - $X^2Σ^+$ electronic system of $^{138}$Ba$^{19}$F is performed using a cold molecular beam produced by a buffer gas source. The hyperfine structure in both $X^2Σ^+$ ground and $A^2Π$ excited states is fully resolved and absolute transition frequencies of individual components are measured at the sub-MHz level making use of frequency-comb laser calibration. Sets of molecular constants for the $X^2Σ^+$($v=0,1$) and $A^2Π$($v=0,1$) levels are determined, with improved accuracy for the $T_{v',v''}$ band origins and spin-orbit interaction constants for the $A^2Π$ excited states, that represent the presently measured highly accurate transitions for low-$J$ states as well as previously determined transition frequencies in Fourier-transform emission studies for rotational levels as high as $J \geq 100$. The extracted molecular constants reproduce the measured transition frequencies at the experimental absolute accuracy of 1 MHz. The work is of relevance for future laser cooling schemes, and is performed in the context of a measurement of the electron dipole moment for which BaF is a target system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06986 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Precision spectroscopy of the $A^2Π$ $\leftarrow$ $X^2Σ^+$ transition in BaF Mooij, M. C. Bethlem, H. L. Ubachs, W. Aggarwal, P. Boeschoten, A. Borschevsky, A. Chamorro, Y. Denis, M. Fikkers, T. H. Hoekstra, S. van Hofslot, J. W. F. Jones, S. A. Marshall, V. R. Meijknecht, T. B. Timmermans, R. G. E. de Vries, J. Willmann, L. Atomic Physics High-resolution spectroscopy on the $A^2Π$ - $X^2Σ^+$ electronic system of $^{138}$Ba$^{19}$F is performed using a cold molecular beam produced by a buffer gas source. The hyperfine structure in both $X^2Σ^+$ ground and $A^2Π$ excited states is fully resolved and absolute transition frequencies of individual components are measured at the sub-MHz level making use of frequency-comb laser calibration. Sets of molecular constants for the $X^2Σ^+$($v=0,1$) and $A^2Π$($v=0,1$) levels are determined, with improved accuracy for the $T_{v',v''}$ band origins and spin-orbit interaction constants for the $A^2Π$ excited states, that represent the presently measured highly accurate transitions for low-$J$ states as well as previously determined transition frequencies in Fourier-transform emission studies for rotational levels as high as $J \geq 100$. The extracted molecular constants reproduce the measured transition frequencies at the experimental absolute accuracy of 1 MHz. The work is of relevance for future laser cooling schemes, and is performed in the context of a measurement of the electron dipole moment for which BaF is a target system. |
| title | Precision spectroscopy of the $A^2Π$ $\leftarrow$ $X^2Σ^+$ transition in BaF |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2511.06986 |