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The [CII]$_{158\mu m}$ line has long been proposed as a promising line tospectroscopically confirm galaxies in the epoch of reionization. In this paperwe present the results of new ALMA observations spectral scanning for [CII] insix particularly luminous Lyman Break Galaxies at $z\sim7$. The six sourceswere drawn from a sample of bright $z\sim7$ galaxies identified using thewide-area optical, near-IR, and Spitzer/IRAC data over the COSMOS/UltraVISTAfield and were targeted on the basis of tight constraints on their redshiftsfrom their IRAC [3.6]-[4.5] colors. We detect significant ($>9\sigma$) [CII]lines in three of our six targets ($50\%$) co-spatial with the rest-$UV$emission from the ground/space-based near-IR imaging. The luminosities of the[CII] lines lie in the range $5.6$ to $8.8\times10^{8}L_{\odot}$, consistentwith the local [CII]-SFR relation. Meanwhile, their[CII]/$L_{IR}\sim1-3\times10^{-3}$ ratios are slightly elevated compared tolocal (U)LIRGS. This could be due to lower dust-to-gas or dust-to-metal ratios.We also find that our sources display a large kinematic diversity, with onesource showing signs of rotation, one source a likely major merger and onedispersion dominated source that might contain a bright star-forming clump. Ourresults highlight the effectiveness of spectral scans with ALMA inspectroscopically confirming luminous galaxies in the epoch of reionization,something that is being be applied on a significantly larger sample in theon-going REBELS large program.

ALMA as a Redshift Machine: Using [CII] to Efficiently Confirm Galaxies in the Epoch of Reionization