title: Synthesis of urea in cometary model ices and implications for Comet 67P/Churyumov-Gerasimenko.
abstract: Urea is considered a fundamental building block in prebiotic chemistry. Its formation on early Earth has not yet been explained satisfactorily and exogenous delivery has been considered. We report on the synthesis along with the first online and in situ identification of urea after exposing inorganic ices to ionizing radiation.
authors.affiliation: Deptartment of Chemistry, University of Hawaii, 2545 McCarthy Mall, 96822 HI, USA. ralfk@hawaii.edu.
authors.forename: M
authors.initials: M
authors.lastname: Förstel
authors.affiliation: Deptartment of Chemistry, University of Hawaii, 2545 McCarthy Mall, 96822 HI, USA. ralfk@hawaii.edu.
authors.forename: P
authors.initials: P
authors.lastname: Maksyutenko
authors.affiliation: Deptartment of Chemistry, University of Hawaii, 2545 McCarthy Mall, 96822 HI, USA. ralfk@hawaii.edu.
authors.forename: B M
authors.initials: BM
authors.lastname: Jones
authors.affiliation: Deptartment of Chemistry, National Dong Hwa University, Shoufeng, Hualien 974, Taiwan. hhchang@mail.ndhu.edu.tw.
authors.forename: B-J
authors.initials: BJ
authors.lastname: Sun
authors.affiliation: Deptartment of Chemistry, National Dong Hwa University, Shoufeng, Hualien 974, Taiwan. hhchang@mail.ndhu.edu.tw.
authors.forename: A H H
authors.initials: AH
authors.lastname: Chang
authors.affiliation: Deptartment of Chemistry, University of Hawaii, 2545 McCarthy Mall, 96822 HI, USA. ralfk@hawaii.edu.
authors.forename: R I
authors.initials: RI
authors.lastname: Kaiser
mesh_terms: D004058:Diffusion; D005118:Extraterrestrial Environment; D007053:Ice / Q000032:analysis*; D019110:Meteoroids; D011827:Radiation; D013057:Spectrum Analysis; D014508:Urea / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D007053:Ice; D014508:Urea