A cryogenic apparatus with a rotatable substrate for matrix isolation spectroscopy of BaF in neon crystals…

Abstract

We present a new experimental apparatus for matrix isolation spectroscopy capable of growing cryogenic crystal matrices doped with barium monofluoride (BaF), a candidate for measurements of the electron electric dipole moment (eEDM). \\ In this work, BaF molecules are produced in a cryogenic buffer-gas source and used to dope a neon matrix grown on a substrate, cooled by a cryocooler, reaching temperatures as low as 3.2 K. A rotatable flange allows for multiple substrate orientations, optimizing spectroscopic investigations and matrix crystal growth. \\ Fluorescence emission analysis of BaF in neon crystal show emission when exciting the A ²Π_1/2, A ²Π_3/2 and B ²Σ⁺ states, along with the presence of fluorescence from barium atoms in the crystal. A first estimation of the column density of BaF in the crystal is given on the order of 5 × 10⁻¹³ cm⁻². \\ We also demonstrated the production of BaF using parahydrogen as the buffer gas of the cryogenic source, a first step toward BaF molecules embedded in a para-hydrogen matrix. \\ Finally, we also observed fast fluorescence decay, attributed to optical bleaching effects, whose amplitude arise at lower temperatures or higher laser intensities, introducing a systematic effect to be studied in future experiments.

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Cite

BibTeX RIS

BibTeX

@misc{lippi2026cryogenic,
  title = {{A cryogenic apparatus with a rotatable substrate for matrix isolation spectroscopy of BaF in neon crystals down to 3.2 K}},
  author = {Alessandro Lippi and Diego Bisero and Caterina Braggio and Giovanni Carugno and Roberto Calabrese and Federico Chiossi and Marco Guarise and Madiha M. Makhdoom and Giuseppe Messineo and Jacopo Pazzini},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.05148},
  eprint = {2610.05148},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.05148},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - A cryogenic apparatus with a rotatable substrate for matrix isolation spectroscopy of BaF in neon crystals down to 3.2 K
AU  - Alessandro Lippi
AU  - Diego Bisero
AU  - Caterina Braggio
AU  - Giovanni Carugno
AU  - Roberto Calabrese
AU  - Federico Chiossi
AU  - Marco Guarise
AU  - Madiha M. Makhdoom
AU  - Giuseppe Messineo
AU  - Jacopo Pazzini
PY  - 2026
DA  - 2026/10/04
PB  - arXiv
DO  - 10.48550/arxiv.2610.05148
UR  - https://arxiv.org/abs/2610.05148
AB  - We present a new experimental apparatus for matrix isolation spectroscopy capable of growing cryogenic crystal matrices doped with barium monofluoride (BaF), a candidate for measurements of the electron electric dipole moment (eEDM). \\ In this work, BaF molecules are produced in a cryogenic buffer-gas source and used to dope a neon matrix grown on a substrate, cooled by a cryocooler, reaching temperatures as low as 3.2 K. A rotatable flange allows for multiple substrate orientations, optimizing spectroscopic investigations and matrix crystal growth. \\ Fluorescence emission analysis of BaF in neon crystal show emission when exciting the A ^2Π_1/2, A ^2Π_3/2 and B ^2Σ^+ states, along with the presence of fluorescence from barium atoms in the crystal. A first estimation of the column density of BaF in the crystal is given on the order of 5 × 10^−13 cm^−2. \\ We also demonstrated the production of BaF using parahydrogen as the buffer gas of the cryogenic source, a first step toward BaF molecules embedded in a para-hydrogen matrix. \\ Finally, we also observed fast fluorescence decay, attributed to optical bleaching effects, whose amplitude arise at lower temperatures or higher laser intensities, introducing a systematic effect to be studied in future experiments.
ER  -