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(Abridged) Electron-molecule interaction is a fundamental process inradiation-driven chemistry in space, from the interstellar medium to comets.Therefore, knowledge of interaction cross-sections is key. While there has beena plethora of studies of total ionization cross-sections, data is often spreadover many sources, or not public or readily available. We introduce theAstrochemistry Low-energy Electron Cross-Section (ALeCS) database, a publicdatabase for electron interaction cross-sections and ionization rates formolecules of astrochemical interest. In this work, we present the first datarelease comprising total ionization cross-sections and ionization rates forover 200 neutral molecules. We include optimized geometries and molecularorbital energies at various levels of theory, and for a subset of themolecules, the ionization potentials. We compute total ionizationcross-sections using the binary-encounter Bethe model and screening-correctedadditivity rule, and ionization rates and reaction network coefficients formolecular cloud environments for $>$200 neutral molecules ranging fromdiatomics to complex organics. We demonstrate that our binary-encounter Bethecross-sections agree well with experimental data. We show that the ionizationrates scale roughly linearly with the number of constituent atoms in themolecule. We introduce and describe the public ALeCS database. For the initialrelease, we include total ionization cross-sections for $>$200 neutralmolecules and several cations and anions calculated with different levels ofquantum chemistry theory, the chemical reaction rates for the ionization, andnetwork files in the formats of the two most popular astrochemical networks,the KIDA and UMIST. The database will be continuously updated for moremolecules and interactions.

The Astrochemistry Low-energy Electron Cross-Section (ALeCS) database I.  Semi-empirical electron-impact ionization cross-section calculations and  ionization rates