title: The photochemistry of biogenic gases in the early and present atmosphere.
authors.affiliation: Atmospheric Sciences Division, NASA Langley Research Center, Hampton, Virginia 23665, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Levine
authors.forename: T R
authors.initials: TR
authors.lastname: Augustsson
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001272:Atmosphere; D002248:Carbon Monoxide / Q000737:chemistry; D018534:Earth, Planet; D019419:Evolution, Planetary; D005740:Gases / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D008956:Models, Chemical; D009609:Nitrous Oxide / Q000737:chemistry; D010777:Photochemistry; D014867:Water / Q000737:chemistry
chemical_list: D005740:Gases; D014867:Water; D000641:Ammonia; D002248:Carbon Monoxide; D009609:Nitrous Oxide; D008697:Methane; D006862:Hydrogen Sulfide