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We present observations of the 3P1-3P0 fine structure transition of atomiccarbon [CI], the J=3-2 transition of CO, as well as of the J=1-0 transitions of13CO and C18O toward DR15, an HII region associated with two mid-infrared darkclouds (IRDCs). The 13CO and C18O J=1-0 emissions closely follow the darkpatches seen in optical wavelength, showing two self-gravitating molecularcores with masses of 2000 Msun and 900 Msun, respectively, at the positions ofthe catalogued IRDCs.  Our data show a rough spatial correlation between [CI] and 13CO J=1-0. Bright[CI] emission occurs in relatively cold gas behind the molecular cores, neitherin highly excited gas traced by CO J=3-2 emission nor in HII region/molecularcloud interface. These results are inconsistent with those predicted bystandard photodissociation region (PDR) models, suggesting an origin forinterstellar atomic carbon unrelated to photodissociation processes.Comment: 11 pages Latex, 6 figures, Accepted for publication in The  Astrophysical Journa

Atomic Carbon and CO Isotope Emission in the Vicinity of DR 15