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The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, the NEXT collaboration is investigating novel synthetic molecular sensors that may capture the Ba dication produced in the decay of certain Xe isotopes in a high-pressure gas experiment. The use of such molecular detectors immobilized on surfaces must be explored in the ultra-dry environment of a xenon gas chamber. Here, using a combination of highly sensitive surface science techniques in ultra-high vacuum, we demonstrate the possibility of employing the so-called Fluorescent Bicolor Indicator as the molecular component of the sensor. We unravel the ion capture process for these molecular indicators immobilized on a surface and explain the origin of the emission fluorescence shift associated to the ion trapping.<\/jats:p>","DOI":"10.1038\/s41467-022-35153-0","type":"journal-article","created":{"date-parts":[[2022,12,14]],"date-time":"2022-12-14T10:04:31Z","timestamp":1671012271000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector"],"prefix":"10.1038","volume":"13","author":[{"given":"P.","family":"Herrero-G\u00f3mez","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3044-2603","authenticated-orcid":false,"given":"J. 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