TY - RPRT TI - Simple model for sequential multiphoton ionization by ultraintense x rays AU - Li, Xiang (ORCID:0000000183384123) AU - Boll, Rebecca AU - Rolles, Daniel (ORCID:0000000239653477) AU - Rudenko, Artem PY - 2021 DO - 10.1103/physreva.104.033115 UR - https://www.osti.gov/biblio/1821516 ID - 1821516 ER -