We report results from a joint experimental and theoretical investigation for the electron impact total ionization cross section (TICS) of R-carvone. Agreement between our measured and calculated TICS over their common energy regimes was, allowing for the measurement uncertainties, typically quite good. However when the independent atom method with screening corrected additivity rule and interference terms computation had its predicted ionization threshold energy corrected to the known experimental value, excellent agreement between it and our measured TICS was in fact found from threshold up to 50 eV.

This work was supported by the Brazilian Conselho Nacional de Desenvolvimento Científico e Tecnologico (CNPq), Fundaçao deAmparo a Pesquisa do Estado de Minas Gerais and FINEP. M.C.A.L.acknowledgesfinancial support from CNPq, while W.A.D.P., A.C.P.F.and R.A.A.A. acknowledge their fellowships from CAPES and FAPEMIG. Somefinancial assistance from the Australian Research Council through grant # DP180101655 is also noted. Finally, G.García thanks the Spanish Ministerio de Ciencia, Innovacion yUniversidades for the project grants FIS 2016 -80440 and PID2019-104727RB-21 and the CSIC project LINKA20085.

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