@article{12251,
  author = {Holly Leopardi and Kyle Beloy and Tobias Bothwell and Samuel Brewer and Sarah Bromley and Jwo-Sy Chen and Scott Diddams and Robert Fasano and Youssef Hassan and David Hume and Dhruv Kedar and Colin Kennedy and David Leibrandt and Andrew Ludlow and William McGrew and William Milner and Daniele Nicolodi and Eric Oelker and Thomas Parker and John Robinson and S. Romisch and Jeffrey Sherman and Lindsay Sonderhouse and Jian Yao and Jun Ye and Xiaogang Zhang and Tara Fortier},
  title = {Measurement of the 27Al+ and 87Sr absolute optical frequencies},
  abstract = {We perform absolute measurement of the 27Al+single-ion and 87Sr neutral lattice clock frequencies at the National Institute of Standards and Technology and JILA at the University of Colorado against a global ensemble of primary frequency standards. Over an eight month period multiple measurements yielded the mean optical atomic transition frequencies nu_Al+= 1 121 015 393 207 859.50(0.36)Hz and nu_Sr=429 228 004 229 873.19(0.15)Hz, where the stated uncertainties are dominated by statistical noise and gaps in the observation interval (‘dead-time’ uncertainty)},
  year = {2021},
  journal = {Metrologia},
  volume = {58},
  chapter = {015017},
  pages = {015017},
  month = {2021-01},
  url = {http://iopscience.iop.org/article/10.1088/1681-7575/abd040},
  doi = {10.1088/1681-7575/abd040},
}