HPC Design of Ion Based Molecular Clusters A. Bende, C. Varodi, T. M. Di Palma INCDTIM – Istituto Motori-CNR, Napoli, Italy Romania-JINR cooperation framework.

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HPC Design of Ion Based Molecular Clusters A. Bende, C. Varodi, T. M. Di Palma INCDTIM – Istituto Motori-CNR, Napoli, Italy Romania-JINR cooperation framework Hulubei-Meshcheryakov Programe

(Source: Prof. Stefan Grimme, Univ. Bonn, Germany)

WFT Modeling molecular structures at WFT level. How? What we exactly know: The quantum mechanical description of the Hydrogen atom. Schördinger equation: Solution:In polar coordinates: x → (r,θ,ϕ) are the associated Laguerre functions are the Legendre polinoms

We assume that all type of molecular orbitals can be described with a linear combination of these atomic orbitals (LCAO). Basis set for molecular orbitals

Problems: -Difficulties with mathematical integration Approximations: -Replace exp(-r) with linear combination of Gaussian type functions exp(-r 2 ) -Basis set truncation: H: s and p orbitals C, O, N, etc s, p, d (f, and g) n=3 or 5 “Molecular Size” = N The Total Number of Basis Functions N = N A + N B + N C + …

Scaling of Quantum Chemistry methods: N 4 : Hartree-Fock, DFT N 5 : Second order Moller-Plesset perturbation theory (MP2) N 6 : MP3 and CCSD (coupled cluster with single and double perturbation N 7 : MP4 and CCSD(T) + Large internal memory (RAM) Huge local storage Efficient routines for manipulation of large matrixes Massive parallelization

Computer facility for numerical simulation and molecular modeling - INCDTIM IBM System iDataPlex dx360 M4: File Server for Storage: General Parallel File System (GPFS);File Server for Storage: General Parallel File System (GPFS); Storage: 20TB with SAS 2.0 disks and rpm, with real storage of 15 TB;Storage: 20TB with SAS 2.0 disks and rpm, with real storage of 15 TB; Two Head Node Servers: CISCx86 6-core, with 2.93 GHz, 12 MB L3 cache;Two Head Node Servers: CISCx86 6-core, with 2.93 GHz, 12 MB L3 cache; 26 Nodes: Two Intel Xeon Sandy Bridge E Core 2.4 GHz, 20 MB L3 cache, DDR3 64 GB, 1600 MHz ECC (416 cores);26 Nodes: Two Intel Xeon Sandy Bridge E Core 2.4 GHz, 20 MB L3 cache, DDR3 64 GB, 1600 MHz ECC (416 cores); 2 Nodes: Two Intel Xeon Sandy Bridge E Core 2,4 GHz, 20 MB L3 cache, DDR3 64 GB, 1600 MHz ECC + NVIDIA Tesla M2090 GPU (32 cores);2 Nodes: Two Intel Xeon Sandy Bridge E Core 2,4 GHz, 20 MB L3 cache, DDR3 64 GB, 1600 MHz ECC + NVIDIA Tesla M2090 GPU (32 cores); Network Connection: FDR Infinteband with 56 GB/s bandwidthNetwork Connection: FDR Infinteband with 56 GB/s bandwidth

Quantum Chemistry Softwares: Gaussian 09 vers. D.01 Molpro Paid licenses: Free licenses: NWChem 6.5 Orca Molecular Dynamics Codes: Amber 12 DFTB+ CRYSTAL 13 Car-Parinello MD

Ion-based molecular clusters: + H + Na Lone pair orbitals Strong electron correlation effects (charge transfer energy)

Experimental: Mass spectra for homogeneous clusters (MTBE) m – t-butyl 88 – MTBE 176 – (MTBE) – (MTBE) 2 – H +

Mass spectra for mixed cluster (MTBE) m –(H 2 O) n –H + unde, n = m – 2 Many peaks!!! Structures based on special H-bond interactions O···H + ···O Strong intermolecular interactions

(MTBE) 2 + Dimer ΔE = kcal/mol 0.81e 0.19e Vertical_IP = 9.25 eV Adiabatic_IP = 8.24 eV C 1 - O Å Å Å C 2 - O Å Å Å B A ~

Two-step proton transfer mechanism

Acetaldehyde – H + and Acetaldehyde – H 3 O + clusters

Tetramer Hexamer

AA 2 – H 3 O + and AA 3 – H 3 O + AA 5 – H 3 O +

Na + - dopped acetaldehyde clusters

AcA Dimer + Na + Trimer Tetramer

Hexamer Octamer

Thank you for your attention