  We have identified 453 compact dense cores in 3 mm continuum emission maps in
the ATOMS (ALMA Three-millimeter Observations of Massive Star-forming regions)
survey, and compiled three catalogues of high-mass star forming cores. One
catalogue, referred to as H/UC-HII catalogue, includes 89 cores that enshroud
hyper/ultra compact (H/UC) HII regions as characterized by associated compact
H40alpha emission. A second catalogue, referred to as pure s-cHMC, includes 32
candidate Hot Molecular Cores (HMCs) showing rich spectra (N>20lines) of
complex organic molecules (COMs) but not associated with H/UC-HII regions. The
third catalogue, referred to as pure w-cHMC, includes 58 candidate HMCs with
relatively low levels of COM richness and not associated with H/UC-HII regions.
These three catalogues of dense cores provide an important foundation for
future studies of the early stages of high-mass star formation across the Milky
Way. We also find that nearly half of H/UC-HII cores are candidate HMCs. From
the number counts of COM-containing and H/UC-HII cores, we suggest that the
duration of high-mass protostellar cores showing chemically rich features is at
least comparable to the lifetime of H/UC-HII regions. For cores in the H/UC-HII
catalogue, the width of the H40alpha line increases as the core size decreases,
suggesting that the non-thermal dynamical and/or pressure line-broadening
mechanisms dominate on the smaller scales of the H/UC-HII cores.
