ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic
  and Deuterated Molecules
  We have observed complex organic molecules (COMs) and deuterated species
toward a hot core/corino (HC) associated with the infrared dark cloud (IRDC)
clump G34.43+00.24 MM3 with the Atacama Large Millimeter/submillimeter Array
(ALMA). We have detected six normal-COMs (CH3OH, CH3CHO, CH3CH2CN, CH3OCH3,
HCOOCH3, and NH2CHO), one deuterated-COM (CH2DCN), and two deuterated
fundamental molecules (D2CO and DNC) toward G34.43+00.24 MM3 HC. None of these
lines, except for CH3OH, are detected toward the shocked regions in our data,
which suggests that COMs do not originate in shocks. The abundance of the COMs
relative to CH3OH in G34.43+00.24 MM3 HC is found to be similar to those in
high-mass hot cores, rather than those in hot corinos in low-mass star-forming
regions. This result suggests that the physical conditions of the warm-up phase
of G34.43+00.24 MM3 HC are similar to those of high-mass sources. On the other
hand, the D2CO abundance relative to CH$_3$OH in G34.43+00.24 MM3 HC is higher
than that of other hot cores, and seems to be comparable to that of hot
corinos. The relatively high D2CO/CH3OH ratio of G34.43+00.24 MM3 HC implies a
long cold starless phase of G34.43+00.24 MM3 HC.
