TY - RPRT TI - Improved interspecies optical clock comparisons through differential spectroscopy AU - Kim, May E. (ORCID:000000022890949X) AU - McGrew, William F. AU - Nardelli, Nicholas V. AU - Clements, Ethan R. AU - Hassan, Youssef S. (ORCID:0000000195398362) AU - Zhang, Xiaogang (ORCID:000000031627069X) AU - Valencia, Jose L. AU - Leopardi, Holly AU - Hume, David B. (ORCID:0000000177972033) AU - Fortier, Tara M. AU - Ludlow, Andrew D. AU - Leibrandt, David R. (ORCID:0000000314524879) PY - 2022 DO - 10.1038/s41567-022-01794-7 UR - https://www.osti.gov/biblio/2425707 ID - 2425707 ER -