Precise Frequencies of H2 16O Lines Protected for Radio Astronomy
Abstract
Precise frequency values have been determined for H 2 16 O radio lines appearing in protected line lists of the International Astronomical Union and the Panel on Frequency Allocations of the US National Academy of Sciences. The improved precision is attributable to a spectroscopic network built from a large set of near-infrared Lamb-dip lines augmented with a handful of ultra-high-accuracy rotational transitions. The ultraprecise H 2 16 O network contains 376 Lamb-dip lines recorded previously via our frequency-comb-locked cavity-enhanced spectrometer. During the present study, a total of 55 target lines have been (re)measured at high accuracy. Due to our network-assisted measurements, the accuracy has been significantly improved with respect to previous direct radio-frequency measurements for all the protected lines of H 2 16 O above 750 GHz. Furthermore, 43 of these protected transitions now benefit from the accuracy of the new near-infrared Lamb dips reported in this paper.
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BibTeX
@article{altman2026precise,
title = {{Precise Frequencies of H2 16O Lines Protected for Radio Astronomy}},
author = {Arthémise Altman and Roland Tóbiás and Alexandr S. Bogomolov and Meissa L. Diouf and Frank M. J. Cozijn and Attila G. Császár and Clément Lauzin and Wim Ubachs},
journal = {The Astrophysical Journal Supplement Series},
year = {2026},
month = oct,
doi = {10.3847/1538-4365/adfc68},
eprint = {2510.15314},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05787949v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Precise Frequencies of H2 16O Lines Protected for Radio Astronomy
AU - Arthémise Altman
AU - Roland Tóbiás
AU - Alexandr S. Bogomolov
AU - Meissa L. Diouf
AU - Frank M. J. Cozijn
AU - Attila G. Császár
AU - Clément Lauzin
AU - Wim Ubachs
PY - 2026
DA - 2026/10/09
JO - The Astrophysical Journal Supplement Series
DO - 10.3847/1538-4365/adfc68
UR - https://hal.science/hal-05787949v1
AB - Precise frequency values have been determined for H 2 16 O radio lines appearing in protected line lists of the International Astronomical Union and the Panel on Frequency Allocations of the US National Academy of Sciences. The improved precision is attributable to a spectroscopic network built from a large set of near-infrared Lamb-dip lines augmented with a handful of ultra-high-accuracy rotational transitions. The ultraprecise H 2 16 O network contains 376 Lamb-dip lines recorded previously via our frequency-comb-locked cavity-enhanced spectrometer. During the present study, a total of 55 target lines have been (re)measured at high accuracy. Due to our network-assisted measurements, the accuracy has been significantly improved with respect to previous direct radio-frequency measurements for all the protected lines of H 2 16 O above 750 GHz. Furthermore, 43 of these protected transitions now benefit from the accuracy of the new near-infrared Lamb dips reported in this paper.
ER -