20.500.12556/DiRROS-27566 Pick-up of organic molecules by mixed Ar clusters a function of gas properties and composition Clusters present an intriguing field of research, with their properties bridging the gap between an isolated atom/molecule and a bulk. They can act as a substrate for dopant molecules picked up on the fly and located on or inside the cluster. Our research on Ar clusters reveals that gas pressure and composition are crucial parameters determining the pickup probability for molecules such as adenine, uracil, glycine, and ascorbic acid. For pure Ar expansion, the most intense molecular signals are observed in the stagnation pressure range between 10 and 30 bar. Adding up to 33 mol% of He or O2 at fixed total pressure causes no change in the intensity of dopant and Ar oligomer signals. The addition of N2O or CO2 results in a significant intensity drop, with signals from the molecule and Ar oligomers disappearing above 3 mol% of N2O or CO2. The opposite effects are observed with the Ar-H2 mixture at a pressure of 25 bar. Optimal results are obtained for H2 concentrations between 40 and 50 mol% versus D2 concentrations between 20 and 35 mol%. Substitution of Ar with an Ar-H2 mixture causes signal intensities of dopants and Ar oligomers to increase by more than threefold. gas clusters argon hydrogen doping pick-up mass spectrometry pulsed gas beam plinski klastrski agregati argon vodik dopiranje (klastrov) zajem (molekul) masna spektrometrija pulzni plinski curek true false true MDPI Švica Angleški jezik Slovenski jezik © 2026 by the authors. Neznano 2026-02-13 09:54:40 2026-02-13 09:54:41 2026-02-14 04:04:01 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 12. 2. 2026; str. 1-20 iss. 3, [article no.] 553 Vol. 31 Feb. 2026 0000-00-00 Zaloznikova Objavljeno apc 2026-01-12 2026-02-03 2026-02-05 544 1420-3049 10.3390/molecules31030553 268305155 https://www.mdpi.com/1420-3049/31/3/553 1 a337c4f3-08b9-11f1-bcbc-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40383 RAZ_Ekar_Jernej_2026.pdf RAZ_Ekar_Jernej_2026.pdf 1 CA1582C2224FF372903F3B0330648817 51784af1d787a024f9ca16a666bbec4ce0a759f1e106080adac68f6b97fab368 d5f2d186-08b9-11f1-bcbc-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40384 Institut Jožef Stefan 0 0 0